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  • Anyone else experiencing high rates of Linux server crashes during a leap second day?

    - by Bron Gondwana
    POSTMORTEM Anticlimax: only thing that died was my VPN (openvpn) link to the cluster, so there was an exciting few seconds while it re-established. Everything else was fine. Starting back ntp everywhere. If you look at Marco's blog at http://my.opera.com/marcomarongiu/blog/2012/06/01/an-humble-attempt-to-work-around-the-leap-second - he has a solution for phasing the time change over 24 hours using ntpd -x to avoid the 1 second skip. Give that a go if it matters to you. For the systems I run, the jump isn't a problem. Just today, Sat June 30th - starting soon after the start of the day GMT. We've had a handful of blades in different datacentres as managed by different teams all go dark - not responding to pings, screen blank. They're all running Debian Squeeze - with everything from stock kernel to custom 3.2.21 builds. Most are Dell M610 blades, but I've also just lost a Dell R510 and other departments have lost machines from other vendors too. There was also an older IBM x3550 which crashed and which I thought might be unrelated, but now I'm wondering. The one crash which I did get a screen dump from said: [3161000.864001] BUG: spinlock lockup on CPU#1, ntpd/3358 [3161000.864001] lock: ffff88083fc0d740, .magic: dead4ead, .owner: imapd/24737, .owner_cpu: 0 Unfortunately the blades all supposedly had kdump configured, but they died so hard that kdump didn't trigger - and they had console blanking turned on. I've disabled console blanking now, so fingers crossed I'll have more information after the next crash. Just want to know if it's a common thread or "just us". It's really odd that they're different units in different datacentres bought at different times and run by different admins (I run the FastMail.FM ones)... and now even different vendor hardware. Most of the machines which crashed had been up for weeks/months and were running 3.1 or 3.2 series kernels. The most recent crash was a machine which had only been up about 6 hours running 3.2.21. THE WORKAROUND Ok people, here's how I worked around it. disabled ntp: /etc/init.d/ntp stop created http://linux.brong.fastmail.fm/2012-06-30/fixtime.pl (code stolen from Marco, see blog posts in comments) ran fixtime.pl without an argument to see that there was a leap second set ran fixtime.pl with an argument to remove the leap second NOTE: depends on adjtimex. I've put a copy of the squeeze adjtimex binary at http://linux.brong.fastmail.fm/2012-06-30/adjtimex - it will run without dependencies on a squeeze 64 bit system. If you put it in the same directory as fixtime.pl, it will be used if the system one isn't present. Obviously if you don't have squeeze 64 bit... find your own. I'm going to start ntp again tomorrow. As an anonymous user suggested - an alternative to running adjtimex is to just set the time yourself, which will presumably also clear the leapsecond counter.

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  • Windows Service Limit Crashes Services on Startup

    - by Paul Williams
    We have developed a custom Windows service in C# as part of a large Enterprise application. Our QA department tests multiple versions of this service. The QA lab has several (over 20) copies of this service installed on one Windows 2003 test box. Each copy is in its own folder and has a unique service name, though each executable file is named the same (OurWindowsService.exe, for example). Each service uses the same Windows credentials (a domain user). The purpose of this service is to handle MSMQ messages. The queued messages do all sorts of important stuff. For some reason, they can run only 5 of these services at a time. When we start a 6th, the service crashes on startup. For example, I can start #1, #2, #3, #4, and #5. When I start #6, it crashes. However, if I stop #1 and start #6, #6 runs fine, and now #1 fails to start. When the services crash, the following error appears in the Windows event log: Faulting application OurWindowsService.exe, version 5.40.1.1, faulting module kernel32.dll, version 5.2.3790.4480, fault address 0x0000bef7. I was able to use WinDbg to generate a postmortem dump file. The dump file revealed that the crash occurs trying to delay load SHLWAPI.dll: 0:000> kb100 ChildEBP RetAddr Args to Child 0012ece4 79037966 c06d007e 00000000 00000001 KERNEL32!RaiseException+0x53 0012ed4c 790099ba 00000008 0012ed08 7c82860c mscoree!__delayLoadHelper2+0x139 0012ed98 790075b1 001550c8 0012edac 0012fb34 mscoree!_tailMerge_**SHLWAPI_dll**+0xd 0012edb0 79007623 001550c8 0012edf8 0012edf4 mscoree!XMLGetVersionWithSupported+0x22 0012ee00 790069a4 aa06f1b0 00000000 000001fe mscoree!RuntimeRequest::GetRuntimeVersion+0x56 0012f478 790077aa 00000001 7903fb4c 0012fb34 mscoree!RuntimeRequest::ComputeVersionString+0x5bd 0012f89c 79007802 00000001 0012f8b4 7903fb4c mscoree!RuntimeRequest::FindVersionedRuntime+0x11c 0012f8b8 79007b19 00000001 00000000 aa06fa6c mscoree!RuntimeRequest::RequestRuntimeDll+0x2c 0012ffa4 79007c02 00000001 0012ffbc 00000000 mscoree!GetInstallation+0x72 0012ffc0 77e6f23b 00000000 00000000 7ffdf000 mscoree!_CorExeMain+0x12 0012fff0 00000000 79007bf0 00000000 78746341 KERNEL32!BaseProcessStart+0x23 I believe the error code handed to Kernel32.RaiseException, c06d007e, means Module Not Found, but I'm not certain. Does this sound familiar to anyone? Are we hitting some limit on the number of service instances on some file name? Does MSMQ dislike more than 5 listening services?

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  • Weird Apache Crash (with Dump) zend_hash_find (), libphp5.so

    - by Jacob84
    To be honest I don't have experience working with Apache. I'm just putting the best of my intentions on solving this and don't know if I'm making it right. So any help will be greatly appreciated. We have a php page wich is throwing the following message in the browser: Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data. The logs from /var/log/httpd doesn't seem to help because It seems that the Apache is unable to write any information. So the exception or error is preventing the writing (maybe ocurring in some stage of the process that makes impossible to log?). I've read about the procedure to make dumps of the apache, and here we have the content: Reading symbols from /lib64/libgpg-error.so.0...(no debugging symbols found)...done. Loaded symbols for /lib64/libgpg-error.so.0 Reading symbols from /usr/lib64/php/modules/zip.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib64/php/modules/zip.so Core was generated by `/usr/sbin/httpd'. Program terminated with signal 11, Segmentation fault. 0 0x00007fb828fff712 in zend_hash_find () from /etc/httpd/modules/libphp5.so Missing separate debuginfos, use: debuginfo-install httpd-2.2.15-15.el6.centos.1.x86_64 I've been looking in the PHP files and I haven't found any direct call to zend_hash_find (wich seems to be causing the error). I've been looking at Google but found nothing related. Can somebody please help? Is there any step that I need to accomplish to know more? Thanks a lot, as always!

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  • PHP scripts randomly becoming really slow to respond - Database lockup?

    - by webnoob
    Hi All, I wasn't sure whether to post this here or on stackoverflow, so apologies if its in the wrong place. I have about 7 php scripts running on a centOS VPS. Each of these scripts contacts a game server and processes the logs, with the logs it either does some database queries or sends info back to the game server. I am having an issue where some of the scripts will randomly become REALLY slow to respond and I don't know where to start with my debugging. Each script connects to its own database schema but on the same MySQL server. Each script will do about 4 inserts per second and twice as many select statements on their respective databases. I thought a database lockup may cause the issue but some console messages that are read from the database are sent to the game servers console without issue every 30 seconds, even when the script is slow to responding to other commands. Non of the scripts are using a lot of memory or CPU power. About 0.1% each. I know this information is really vague but I don't know linux very well at all (in fact, top is about my limit) and I really don't know where to start debugging this. Thanks.

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  • Java Swing over Remote Desktop - Strange, weird GUI squashing

    - by ADTC
    I thought this question fits SuperUser more than StackOverflow because it's not about actual Java programming, though programmers might be more likely to encounter the problem. Anyway, let me start of with some stats before I ask the actual question: Laptop: Windows 7 x32 Screen resolution 1024 x 768; Nvidia GeForce Go 6200 Connected to desktop via ad-hoc wireless network Access internet via desktop Desktop: Windows 7 x64 Screen resolution 1920 x 1080 Connected to laptop via ad-hoc wireless network Access internet via cable modem I'm connecting to my laptop via Remote Desktop from my desktop to take advantage of the large screen. I'm doing programming on my laptop (for portability reasons). Everything else runs smooth and fast over Remote Desktop as both computers are connected directly over the ad-hoc wireless. The only problem is this: Java Swing apps don't display the GUI properly. I acquired a Java Swing application and I'm debugging it in Eclipse. Here's what I got when I ran the app: Apparently there doesn't seem to be anything wrong with the GUI application I'm debugging, because the Java Control Panel exhibits the same problem. I've searched high and low in Google about this; the closest I came to a solution is this. But sadly, the use of -Dsun.java2d.nodraw=true has no effect at all. This only happens over Remote Desktop. I have tried locally and the GUI apps display properly. This isn't a dealbreaker for me as I can stop using Remote Desktop when developing Java Swing apps. However, I would like to know if anyone has encountered this and found any solution. PS: All software involved (Eclipse, Java JRE, etc.) are latest versions.

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  • How to enable error log in lighttpd properly?

    - by Tomaszs
    I have a Centos 5 system with Lighttpd and fastcgi enabled. It does log access but does not log errors. I have Internal Server Error 500 and no info in log and when I try to open not -existing file also - no info in error log. How to enable it properly? Below is list of modules that I've enabled: server.modules = ( "mod_rewrite", "mod_redirect", "mod_alias", # "mod_access", # "mod_cml", # "mod_trigger_b4_dl", # "mod_auth", "mod_status", "mod_setenv", "mod_fastcgi", # "mod_webdav", # "mod_proxy_core", # "mod_proxy_backend_fastcgi", # "mod_proxy_backend_scgi", # "mod_proxy_backend_ajp13", # "mod_simple_vhost", # "mod_evhost", # "mod_userdir", # "mod_cgi", # "mod_compress", # "mod_ssi", # "mod_usertrack", # "mod_expire", # "mod_secdownload", # "mod_rrdtool", "mod_accesslog" ) Here are setting of debugging: ## enable debugging #debug.log-request-header = "enable" #debug.log-response-header = "enable" #debug.log-request-handling = "enable" debug.log-file-not-found = "enable" #debug.log-condition-handling = "enable" Setting of path to error and access log: ## where to send error-messages to server.errorlog = "/home/lxadmin/httpd/lighttpd/error.log" #### accesslog module accesslog.filename = "/home/lxadmin/httpd/lighttpd/ligh.log" Settings of fastcgi: fastcgi.debug = 1 fastcgi.server = ( ".php" => (( "bin-path" => "/usr/bin/php-cgi", "socket" => "/tmp/php.socket", "max-procs" => 12, "bin-environment" => ( "PHP_FCGI_CHILDREN" => "2", "PHP_FCGI_MAX_REQUESTS" => "500" ) ))) And in included config file I have: server.errorlog = "/home/httpd/mywebsite.com/stats/mywebsite.com-error_log" What comes to log files: /home/httpd/mywebsite.com/stats/ -rw-r--r-- 1 apache apache 5173239 May 16 11:34 mywebsite.com-custom_log -rwxrwxrwx 1 root root 0 Mar 27 2009 mywebsite.com-error_log /home/lxadmin/httpd/lighttpd/ -rwxrwxrwx 1 apache apache 2184 Apr 22 22:59 error.log -rwxrwxrwx 1 apache apache 6088621 May 16 11:26 ligh.log I gave error logs chmod 777 for a try to check if it's the issue, but apparently it's not. So my question is: what to do to have error log enabled?

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  • Preventing DDOS/SYN attacks (as far as possible)

    - by Godius
    Recently my CENTOS machine has been under many attacks. I run MRTG and the TCP connections graph shoots up like crazy when an attack is going on. It results in the machine becoming inaccessible. My MRTG graph: mrtg graph This is my current /etc/sysctl.conf config # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 1 # Controls whether core dumps will append the PID to the core filename # Useful for debugging multi-threaded applications kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Controls the maximum size of a message, in bytes kernel.msgmnb = 65536 # Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.conf.all.accept_redirects = 0 net.ipv6.conf.all.accept_redirects = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_max_syn_backlog = 1280 Futher more in my Iptables file (/etc/sysconfig/iptables ) I only have this setup # Generated by iptables-save v1.3.5 on Mon Feb 14 07:07:31 2011 *filter :INPUT ACCEPT [1139630:287215872] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1222418:555508541] Together with the settings above, there are about 800 IP's blocked via the iptables file by lines like: -A INPUT -s 82.77.119.47 -j DROP These have all been added by my hoster, when Ive emailed them in the past about attacks. Im no expert, but im not sure if this is ideal. My question is, what are some good things to add to the iptables file and possibly other files which would make it harder for the attackers to attack my machine without closing out any non-attacking users. Thanks in advance!

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  • Understanding tcptraceroute versus http response

    - by kojiro
    I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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  • Having munin server monitoring problem: Graphs not being generated.

    - by geerlingguy
    When I run munin-cron (munin-cron --debug), I get the following error: 2010/05/10 13:39:01 [WARNING] Call to accept timed out. Remaining workers: archstl.org;archstl.archstl.org 2010/05/10 13:39:01 [DEBUG] Active workers: 1/8 These errors simply keep repeating themselves until I quit munin-cron. I've followed the directions for debugging munin on the 'Debugging Munin plugins' wiki page, but I get the following results when going through their directions: After telnetting to localhost 4949, I can see a list of plugins, see a node at archstl.archstl.org, but can't fetch anything. The output is as follows: >fetch cpu . However, on the same machine (which is both the node and the master munin server), I can run munin-run cpu, and it prints the results correctly to the command line, like so: user.value 100829130 nice.value 3479880 system.value 13969362 idle.value 664312639 iowait.value 12180168 irq.value 14242 softirq.value 199526 steal.value 0 Looking at the wiki page mentioned above, it looks like it might be a plugin environment problem, but I can't figure out how to fix/change this... If the plugin does run with munin-run but not through telnet, you probably have a PATH problem. Tip: Set env.PATH for the plugin in the plugin's environment file.

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  • XNA Notes 007

    - by George Clingerman
    Every week I keep wondering if there’s going to be enough activity in the community to keep doing these notes on a weekly basis and every week I’m reminded of just how awesome and active the XNA community is. There’s engines being made, tutorials being created, games being crafted. There’s information being shared, questions being answered and then there’s another whole community around the Xbox LIVE Indie Games themselves. It’s really incredibly to just watch all that’s going on and I’m glad I’m playing a small part in all of this. So here’s what I noticed happening in the XNA community last week. If there’s things I’m missing, always feel free to let me know. I love learning about new corners of the XNA community that I wasn’t aware of or just have been missing! XNA Developers: Uditha Bandara held an XNA Game Development Workshops at Singapore Universities http://uditha.wordpress.com/2011/02/18/xna-game-development-workshops-at-singapore-universities-event-update/ Binary Tweed gives his talks about Indie City and gives his opinion on the false promise of digital distribution http://www.develop-online.net/news/37053/OPINION-The-false-promise-of-digital-distribution Kris Steele posts his Trivia or Die postmortem http://www.krissteele.net/blogdetails.aspx?id=246 @MadNinjaSkills (James Johnston) posts his feelings on testing for XBLIG http://www.ezmuze.co.uk/101 Simon (@DDReaper) posts hints and tips for XNA developers to help get the size of their projects down http://twitter.com/#!/DDReaper/status/38279440924545024 http://xna-uk.net/blogs/darkgenesis/archive/2011/02/17/look-at-the-size-of-that-thing.aspx Michael B. McLaughlin proving why he should be an XNA MVP posts the list of commonly used value types in XNA games http://geekswithblogs.net/mikebmcl/archive/2011/02/17/list-of-commonly-used-value-types-in-xna-games.aspx http://twitter.com/#!/mikebmcl/status/38166541354811392 Paul Powell (@ITSligoPaul) posts about a common sprite batch as a game service http://itspaulsblog.blogspot.com/2011/02/xna-common-sprite-batch-as-game-service.html @SigilXNA (John Defenbaugh) posts his new level editor video for the sequel to Opac’s Journey http://twitter.com/SigilXNA/statuses/36548174373982209 http://twitter.com/#!/SigilXNA/status/36548174373982209 http://youtu.be/QHbmxB_2AW8 @jwatte updates kW Animation for XNA 4.0 http://www.enchantedage.com/xna-animation @DSebJ posts Blender to SunBurn http://twitter.com/#!/DSebJ/status/36564920224976896 http://dsebj.evolvingsoftware.com/?p=187 Ads and WP7 Games - @mechaghost shares his revenue data for his ad based games http://www.occasionalgamer.com/2011/02/09/ads-and-wp7-games/ Xbox LIVE Indie Games (XBLIG): Steven Hurdle posts day 100 of his quest to find a fantastic XBLIG purchase every day http://writingsofmassdeduction.com/2011/02/17/day-100-radiangames-ballistic/ Xbox 360 Indie Game Buying Guide - 12 games for $60 including several Xbox LIVE Indie games! (although if the XNA community was asked we could have recommended 60 games for $60...) http://www.indiegamemag.com/xbox360-indie-games-buying-guide/ The best selling Xbox LIVE Indie games of 2010 http://www.1up.com/news/xbox-live-most-popular-games I’d buy that for a dollar! - the California Literary Review points out a few gems on the XBLIG marketplace (and other places) where you can game on the cheap. http://calitreview.com/14125 Armless Octopus Episode 39 - The Indie Gem Octocast http://www.armlessoctopus.com/2011/02/17/armless-octocast-episode-39-the-indie-gem-octocast/ Ska Studios posts a plethora of updates http://www.ska-studios.com/2011/02/11/good-morning-gato-49/ http://www.ska-studios.com/2011/02/14/vampire-smile-valentines/ http://www.ska-studios.com/2011/02/16/the-dishwasher-vs-finds-a-home/ Kotaku posts about the Xbox LIVE Indie Game that makes you go Pew Pew Pew Pew Pew Pew http://kotaku.com/#!5760632/the-game-that-makes-you-go-pew-pew-pew-pew-pew-pew-pew GameMarx continues to be active and doing a ton for the XBLIG community reviews and Top 5 indie games of the week 2/4-2/10 http://www.gamemarx.com/video/the-show/22/ep-9-february-11-2010.aspx a new podcast Xbox Indie New Releases http://twitter.com/#!/gamemarx/status/36888849107910656 http://www.gamemarx.com/news/2011/02/13/a-new-podcast-xbox-indie-new-releases.aspx @MasterBlud uploads Indocalypse XBLIG Collections #2 http://www.youtube.com/watch?v=uzCZSv075mc&feature=youtu.be&a http://twitter.com/#!/MasterBlud/status/37100029697064960 Just Press Start interviews Michael Hicks from MichaelArts, 18 year old creator of Honor in Vengeance http://justpressstart.net/?p=465 Achievement Locked interviews Kris Steele of FunInfused Games http://xboxindies.wordpress.com/2011/02/11/interview-fun-infused-games/ XNA Game Development: XNA -UK launches their XAP test service to help the XNA community http://xna-uk.net/blogs/news/archive/2011/02/18/xna-uk-xap-test-service-now-live.aspx Transmute shows off a video of the standard character editor http://www.youtube.com/watch?v=qqH6gErG948&feature=youtu.be Microsoft Tech Student introduces their first tech student of the month.  Meet Daniel Van Tassel from the University of Utah and learn how he created an Xbox LIVE Indie Game using XNA Studio http://blogs.msdn.com/b/techstudent/archive/2010/12/22/introducing-our-first-tech-student-of-the-month-daniel-van-tassel.aspx XNA for Silverlight Developers Part 3 - Animation (transforms) http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-3-Animation-transforms.aspx XNA for Silverlight Developers Part 4 - Animation (frame based) http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-4-Animation-frame-based.aspx @suhinini tweets about an XNA Sprite Font generation tool http://twitter.com/#!/suhinini/status/36841370131890176 http://www.nubik.com/SpriteFont/ XNATouch 1.5 is out and in it’s words is faster, simpler, more reliable and has the XNA 4.0 API http://monogame.codeplex.com/releases/view/60815 IndieCity is hosting marketing workshops for Indie Developers (UK and US) http://forums.create.msdn.com/forums/p/75197/457654.aspx#457654 New York Students - Learn XNA and Silverlight for Xbox 360 and Windows Phone 7 http://forums.create.msdn.com/forums/p/72753/456964.aspx#456964 http://blogs.msdn.com/b/andrewparsons/archive/2011/01/13/learn-to-build-your-own-games-for-xbox-360-and-windows-phone-7.aspx http://blogs.msdn.com/b/andrewparsons/archive/2011/01/13/build-a-game-in-48-hours-win-a-kinect-or-windows-phone-7.aspx Extra Credits: Videogame Music http://www.escapistmagazine.com/videos/view/extra-credits/2019-Videogame-Music Steve Pavlina posts an article with useful information for all XNA/XBLIG developers http://www.stevepavlina.com/blog/2011/02/completion-vs-perfection/

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  • Set the JAXB context factory initialization class to be used

    - by user1902288
    I have updated our projects (Java EE based running on Websphere 8.5) to use a new release of a company internal framework (and Ejb 3.x deployment descriptors rather than the 2.x ones). Since then my integration Tests fail with the following exception: [java.lang.ClassNotFoundException: com.ibm.xml.xlxp2.jaxb.JAXBContextFactory] I can build the application with the previous framework release and everything works fine. While debugging i noticed that within the ContextFinder (javax.xml.bind) there are two different behaviours: Previous Version (Everything works just fine): None of the different places brings up a factory class so the default factory class gets loaded which is com.sun.xml.internal.bind.v2.ContextFactory (defined as String constant within the class). Upgraded Version (ClassNotFound): There is a resource "META-INF/services/javax.xml.bind.JAXBContext" beeing loaded successfully and the first line read makes the ContextFinder attempt to load "com.ibm.xml.xlxp2.jaxb.JAXBContextFactory" which causes the error. I now have two questions: What sort is that resource? Because inside our EAR there is two WARs and none of those two contains a folder services in its META-INF directory. Where could that value be from otherwise? Because a filediff showed me no new or changed properties files. No need to say i am going to read all about the JAXB configuration possibilities but if you have first insights on what could have gone wrong or help me out with that resource (is it a real file i have to look for?) id appreciate a lot. Many Thanks! EDIT (according to comments Input/Questions): Out of curiosity, does your framework include JAXB JARs? Did the old version of your framework include jaxb.properties? Indeed (i am a bit surprised) the framework has a customized eclipselink-2.4.1-.jar inside the EAR that includes both a JAXB implementation and a jaxb.properties file that shows the following entry in both versions (the one that finds the factory as well as in the one that throws the exception): javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory I think this is has nothing to do with the current issue since the jar stayed exactly the same in both EARs (the one that runs/ the one with the expection) It's also not clear to me why the old version of the framework was ever selecting the com.sun implementation There is a class javax.xml.bind.ContextFinder which is responsible for initializing the JAXBContextFactory. This class searches various placess for the existance of a jaxb.properties file or a "javax.xml.bind.JAXBContext" resource. If ALL of those places dont show up which Context Factory to use there is a deault factory loaded which is hardcoded in the class itself: private static final String PLATFORM_DEFAULT_FACTORY_CLASS = "com.sun.xml.internal.bind.v2.ContextFactory"; Now back to my problem: Building with the previous version of the framework (and EJB 2.x deployment descriptors) everything works fine). While debugging i can see that there is no configuration found and thatfore above mentioned default factory is loaded. Building with the new version of the framework (and EJB 3.x deployment descriptors so i can deploy) ONLY A TESTCASE fails but the rest of the functionality works (like i can send requests to our webservice and they dont trigger any errors). While debugging i can see that there is a configuration found. This resource is named "META-INF/services/javax.xml.bind.JAXBContext". Here are the most important lines of how this resource leads to the attempt to load 'com.ibm.xml.xlxp2.jaxb.JAXBContextFactory' which then throws the ClassNotFoundException. This is simplified source of the mentioned javax.xml.bind.ContextFinder class: URL resourceURL = ClassLoader.getSystemResource("META-INF/services/javax.xml.bind.JAXBContext"); BufferedReader r = new BufferedReader(new InputStreamReader(resourceURL.openStream(), "UTF-8")); String factoryClassName = r.readLine().trim(); The field factoryClassName now has the value 'com.ibm.xml.xlxp2.jaxb.JAXBContextFactory' (The day i understand how to format source code on stackoverflow will be my biggest step ahead.... sorry for the formatting after 20 mins it still looks the same :() Because this has become a super lager question i will also add a bounty :)

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  • CodePlex Daily Summary for Thursday, May 20, 2010

    CodePlex Daily Summary for Thursday, May 20, 2010New ProjectsAlphaChannel: Closed projectAragon Online Client: The Aragon Online Client is a front-end application allowing users to play the online game http://aragon-online.net The client fetches game data a...BISBCarManager: Car managerBlammo.Net: Blammo.Net is a simple logging system that allows for multiple files, has simple configuration, and is modular.C# IMAPI2 Samples: This project is my effort to port the VB Script IMAPI2 samples to C# 4.0 and provide CD/DVD Burning capabilities in C#. This takes advantage of th...DemotToolkit: A toolbox to help you enjoy the demotivators.FMI Silverlight Course: This is the site for the final project of the Silverlight course taught at the Sofia University in the summer semester of 2010.InfoPath Publisher Helper: Building a large set of InfoPath Templates? Bored of the repetive stsadm commands to deploy an online form? This tool will allow you to submit ...JSBallBounce - HTML5 Stereocopy: A demo of basic stereoscopy in HTML5Kindler: Kindler allows you to easily convert simply HTML into documents that can be easily read on the Amazon Kindle.Maybe: Maybe or IfNotNull using lambdas for deep expressions. int? CityId= employee.Maybe(e=>e.Person.Address.City);PopCorn Project : play music with system beeps: PopCorn is an application that can play monophonic music through system beeps. You can launch music on the local machine, or on a remote server thr...RuneScape 2 Chronos - Emulation done right.: RuneScape 2 Chronos is a RuneScape 2 Emulator framework. It is completely open-source and is programmed in a way in which should be simpler for it'...RWEntregas: Projeto do Rogrigo e Wender referente a entregasSilverAmp: A media player to demonstrate lots of new Silverlight 4 features. Running out of browser and reading files from the MyMusic folder are two of them....Silverlight Scheduler: A light-weight silverlight scheduler control.SimpleContainer: SimpleContainer is very simple IoC container that consists of one class that implements two remarkable methods: one for registration and one for re...sqlserverextensions: This project will provide some use operations for files and directories. Further development will include extended string operations.TechWorks Portugal Sample BI Project: Techworks is a complete Microsoft BI sample project customized for Portugal to be used in demo and learning scenarios. It is based in SQL Server 20...Test4Proj: Test4ProjTV Show Renamer: TV Show Renamer is a program that is designed to take files downloaded off the internet and rename them to a more user friendly file name. It is fo...UnFreeZeMouSeW7: This small application disable or enable the standby mode on Windows 7 devices. As the mouse pointer freezes or the latency increase on some device...VianaNET - Videoanalysis for physical motion: The VianaNET project targets physics education. The software enables to analyze the motion of colored objects in life-video and video files. The da...Visual Studio 2010 extension for helping SharePoint 2010 debugging: This is a Visual Studio 2010 extensibility project that extends the debugging support for the built-in SharePoint 2010 tools with new menu items an...Visual Studio 2010 Load Test Plugins Library: Useful plugin library for Visual Studio Load Test 2010 version. (Best for web tests).VMware Lab Manager Powershell Cmdlet: This is a simple powershell cmdlet which connects you with the VMware lab manager internal soap api.Webgame UI: Bot to webgameNew ReleasesActipro WPF Controls Contrib: v2010.1: Minor tweaks and updated to target Actipro WPF Studio 2010.1. Addition of Editors.Interop.Datagrid project, which allows Actipro Editors for WPF t...Blammo.Net: Blammo.Net 1.0: This is the initial release of Blammo.Net.Build Version Increment Add-In Visual Studio: Shared Assembly Info Setup: Example solution that makes use of one shared assembly info file.CSS 360 Planetary Calendar: Zero Feature Release: =============================================================================== Zero Feature Release Version: 0.0 Description: This is a binar...DotNetNuke® Community Edition: 05.04.02: Updated the Installation Wizard's Polish & German language packs. Improved performance of Sql script for listing modules by portal. Improved De...DotNetNuke® Store: 02.01.36: What's New in this release? Bugs corrected: - The reference to resource.zip has been commented in the Install package. Sorry for that it's my mista...Extend SmallBasic: Teaching Extensions v.016: added turtle tree quizExtremeML: ExtremeML v1.0 Beta 2: Following the decision to terminate development of the Premium Edition of ExtremeML, this release includes all code previously restricted to the Pr...InfoPath Publisher Helper: 1st Release: InfoPath Publisher Helper Tool The version is mostly stable. There are some UI errors, which can be ignored. The code has not been cleaned up so t...JSBallBounce - HTML5 Stereocopy: HTML5 Stereoscopic Bouncing Balls Demo: Stereoscopic rendering in HTML5kdar: KDAR 0.0.22: KDAR - Kernel Debugger Anti Rootkit - signature's bases updated - ALPC port jbject check added - tcpip internal critical area checks added - some ...Lightweight Fluent Workflow: Objectflow core: Release Notes Fixed minor defects Framework changes Added IsFalse for boolean conditions Defects fixed IsTrue works with Not operator Installati...LiquidSilver SharePoint Framework: LiquidSilver 0.2.0.0 Beta: Changes in this version: - Fixed a bug in HgListItem when parsing double and int fields. - Added the LiquidSilver.Extra project. - Added the Liquid...Matrix: MatrixPlugin-0.5.1: Works with UniqueRoutes plugin on Google Code Works in Linux (path changes, variable usage etc) Builds .st2plugin by default Adapted to ST3MRDS Samples: MRDS Samples 1.0: Initial Release Please read the installation instructions on the Read Me page carefully before you unzip the samples. This ZIP file contains sourc...PopCorn Project : play music with system beeps: Popcorn v0.1: 1st beta releaseRuneScape 2 Chronos - Emulation done right.: Revision 0: Alpha stage of the Chronos source.SCSI Interface for Multimedia and Block Devices: Release 13 - Integrated Shell, x64 Fixes, and more: Changes from the previous version: - Added an integrated shell browser to the program and removed the Add/Remove File/Folder buttons, since the she...Silverlight Console: Silverlight Console Release 2: Release contains: - Orktane.Console.dll - Orktane.ScriptActions.dll Release targets: - Silverlight 4 Dependencies: - nRoute.Toolkit for Silverlig...SimpleContainer: SimpleContainer: Initial release of SimpleContainer library.Springshield Sample Site for EPiServer CMS: Springshield 1.0: City of Springshield - The accessible sample site for EPiServer CMS 6. Read the readme.txt on how to install.SQL Trim: 20100519: Improved releasesqlserverextensions: V 0.1 alpha: Version 0.1 Alphasvchost viewer: svchost viewer ver. 0.5.0.1: Got some feedback from a user, with some nice ideas so here they are: • Made the program resizable. • Program now saves the size and position when...Tribe.Cache: Tribe.Cache RC: Release Candidate There are breaking changes between BETA and RC :- 1) Cache Dictionary is now not exposed to the client. 2) Completly Thread Sa...TV Show Renamer: TV Show Renamer: This is the first public release. Don't worry that it is version 2.1 that is because i keep adding features to it and then upping the version numbe...UnFreeZeMouSeW7: UnFreeZeMouSeW7 0.1: First releaseVCC: Latest build, v2.1.30519.0: Automatic drop of latest buildVianaNET - Videoanalysis for physical motion: VianaNET V1.1 - alpha: This is the first alpha release of the completely rewritten Viana. Known issues are: - sometimes black frame at initial load of video - no abilit...visinia: visinia_1: The beta is gone, the visinia is here with visinia 1. now you can confidently install visinia use visinia and enjoy visinia. This version of visini...visinia: visinia_1_Src: The beta is gone, the visinia is here with visinia 1. now you can confidently install visinia use visinia and enjoy visinia. This version of visini...Visual Studio 2010 extension for helping SharePoint 2010 debugging: 1.0 First public release: The extension is released as a Visual Studio 2010 solution. See my related blog post at http://pholpar.wordpress.com/2010/05/20/visual-studio-2010-...Visual Studio 2010 Load Test Plugins Library: version 1 stable: version 1 stableVMware Lab Manager Powershell Cmdlet: LMCmdlet 1.0.0: first Release. You need to be an Administrator to install this cmdlet. After you run setup open powershell type: Get-PSSnapin -Registered you sh...WF Personalplaner: Personalplaner v1.7.29.10139: - Wenn ein Schema erstellt wird mit der Checkbox "Als neues Schema speichern" wurde pro Person ein Schema erstellt - Wenn ein Pensum geändert wurde...XAM.NET: XAM 1.0p2 + Issue Tracker 8396: Patch release for Issue Tracker 8396Xrns2XMod: Xrns2XMod 1.2: Fixed 32 bit flac conversion - Thanks to Yuri for updating FlacBox librariesMost Popular ProjectsRawrWBFS ManagerAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)patterns & practices – Enterprise LibraryMicrosoft SQL Server Community & SamplesPHPExcelASP.NETMost Active Projectspatterns & practices – Enterprise LibraryRawrPHPExcelGMap.NET - Great Maps for Windows Forms & PresentationCustomer Portal Accelerator for Microsoft Dynamics CRMBlogEngine.NETWindows Azure Command-line Tools for PHP DevelopersCassiniDev - Cassini 3.5/4.0 Developers EditionSQL Server PowerShell ExtensionsFluent Ribbon Control Suite

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  • CodePlex Daily Summary for Monday, August 27, 2012

    CodePlex Daily Summary for Monday, August 27, 2012Popular ReleasesHome Access Plus+: v8.0: v8.0827.1800 RELEASE CHANGED TO BETA Any issues, please log them on http://www.edugeek.net/forums/home-access-plus/ This is full release, NO upgrade ZIP will be provided as most files require replacing. To upgrade from a previous version, delete everything but your AppData folder, extract all but the AppData folder and run your HAP+ install Documentation is supplied in the Web Zip The Quota Services require executing a script to register the service, this can be found in there install di...Math.NET Numerics: Math.NET Numerics v2.2.0: Major linear algebra rework since v2.1, now available on Codeplex as well (previous versions were only available via NuGet). Also available as NuGet packages: PM> Install-Package MathNet.Numerics PM> Install-Package MathNet.Numerics.FSharp New: instead of the special Silverlight build we now provide a portable version supporting .Net 4, Silverlight 5 and .Net Core (WinRT) 4.5: PM> Install-Package MathNet.Numerics.PortableMetodología General Ajustada - MGA: 03.00.08: Cambios Aury: Cambios realizados en el reporte de la MGA: Errores en la generación cuando se seleccionan todas las opciones y Que sólo se imprima la información de la alternativa seleccionada para el proyecto. Cambios John: Integración de código con cambios enviados por Aury Niño. Generación de instaladores. Soporte técnico por correo electrónico y telefónico.Phalanger - The PHP Language Compiler for the .NET Framework: 3.0.0.3391 (September 2012): New features: Extended ReflectionClass libxml error handling, constants TreatWarningsAsErrors MSBuild option OnlyPrecompiledCode configuration option; allows to use only compiled code Fixes: ArgsAware exception fix accessing .NET properties bug fix ASP.NET session handler fix for OutOfProc mode Phalanger Tools for Visual Studio: Visual Studio 2010 & 2012 New debugger engine, PHP-like debugging Lot of fixes of project files, formatting, smart indent, colorization etc. Improved ...WatchersNET CKEditor™ Provider for DotNetNuke®: CKEditor Provider 1.14.06: Whats New Added CKEditor 3.6.4 oEmbed Plugin can now handle short urls changes The Template File can now parsed from an xml file instead of js (More Info...) Style Sets can now parsed from an xml file instead of js (More Info...) Fixed Showing wrong Pages in Child Portal in the Link Dialog Fixed Urls in dnnpages Plugin Fixed Issue #6969 WordCount Plugin Fixed Issue #6973 File-Browser: Fixed Deleting of Files File-Browser: Improved loading time File-Browser: Improved the loa...MabiCommerce: MabiCommerce 1.0.1: What's NewSetup now creates shortcuts Fix spelling errors Minor enhancement to the Map window.ScintillaNET: ScintillaNET 2.5.2: This release has been built from the 2.5 branch. Version 2.5.2 is functionally identical to the 2.5.1 release but also includes the XML documentation comments file generated by Visual Studio. It is not 100% comprehensive but it will give you Visual Studio IntelliSense for a large part of the API. Just make sure the ScintillaNET.xml file is in the same folder as the ScintillaNET.dll reference you're using in your projects. (The XML file does not need to be distributed with your application)....TouchInjector: TouchInjector 1.1: Version 1.1: fixed a bug with the autorun optionWinRT XAML Toolkit: WinRT XAML Toolkit - 1.2.0: WinRT XAML Toolkit based on the Windows 8 RTM SDK. Download the latest source from the SOURCE CODE page. For compiled version use NuGet. You can add it to your project in Visual Studio by going to View/Other Windows/Package Manager Console and entering: PM> Install-Package winrtxamltoolkit Features AsyncUI extensions Controls and control extensions Converters Debugging helpers Imaging IO helpers VisualTree helpers Samples Recent changes NOTE: Namespace changes DebugConsol...BlackJumboDog: Ver5.7.1: 2012.08.25 Ver5.7.1 (1)?????·?????LING?????????????? (2)SMTP???（????）????、?????\?????????????????????Christoc's DotNetNuke Module Development Template: 00.00.09 for DNN6: Probably the final VS2010 Release as I have some new VS2012 templates coming. BEFORE USE YOU need to install the MSBuild Community Tasks available from https://github.com/loresoft/msbuildtasks/downloads For best results you should configure your development environment as described in this blog post Then read this latest blog post about customizing and using these custom templates. Installation is simple To use this template place the ZIP (not extracted) file in your My Documents\Visual ...Visual Studio Team Foundation Server Branching and Merging Guide: v2 - Visual Studio 2012: Welcome to the Branching and Merging Guide Quality-Bar Details Documentation has been reviewed by Visual Studio ALM Rangers Documentation has been through an independent technical review Documentation has been reviewed by the quality and recording team All critical bugs have been resolved Known Issues / Bugs Spelling, grammar and content revisions are in progress. Hotfix will be published.Microsoft Ajax Minifier: Microsoft Ajax Minifier 4.62: Fix for issue #18525 - escaped characters in CSS identifiers get double-escaped if the character immediately after the backslash is not normally allowed in an identifier. fixed symbol problem with nuget package. 4.62 should have nuget symbols available again. Also want to highlight again the breaking change introduced in 4.61 regarding the renaming of the DLL from AjaxMin.dll to AjaxMinLibrary.dll to fix strong-name collisions between the DLL and the EXE. Please be aware of this change and...nopCommerce. Open source shopping cart (ASP.NET MVC): nopcommerce 2.65: As some of you may know we were planning to release version 2.70 much later (the end of September). But today we have to release this intermediate version (2.65). It fixes a critical issue caused by a third-party assembly when running nopCommerce on a server with .NET 4.5 installed. No major features have been introduced with this release as our development efforts were focused on further enhancements and fixing bugs. To see the full list of fixes and changes please visit the release notes p...MyRouter (Virtual WiFi Router): MyRouter 1.2.9: . Fix: Some missing changes for fixing the window subclassing crash. · Fix: fixed bug when Run MyRouter at the first Time. · Fix: Log File · Fix: improve performance speed application · fix: solve some Exception.TFS Project Test Migrator: TestPlanMigration v1.0.0: Release 1.0.0 This first version do not create the test cases in the target project because the goal was to restore a Test Plan + Test Suite hierarchy after a manual user deletion without restoring all the Project Collection Database. As I discovered, deleting a Test Plan will do the following : - Delete all TestSuiteEntry (the link between a Test Suite node and a Test Case) - Delete all TestSuite (the nodes in the test hierarchy), including root TestSuite - Delete the TestPlan Test c...ERPStore eCommerce FrontOffice: ERPStore.Core V4.0.0.2 MVC4 RTM: ERPStore.Core V4.0.0.2 MVC4 RTM (Code Source)ZXing.Net: ZXing.Net 0.8.0.0: sync with rev. 2393 of the java version improved API, direct support for multiple barcode decoding, wrapper for barcode generating many other improvements and fixes encoder and decoder command line clients demo client for emguCV dev documentation startedMFCMAPI: August 2012 Release: Build: 15.0.0.1035 Full release notes at SGriffin's blog. If you just want to run the MFCMAPI or MrMAPI, get the executables. If you want to debug them, get the symbol files and the source. The 64 bit builds will only work on a machine with Outlook 2010 64 bit installed. All other machines should use the 32 bit builds, regardless of the operating system. Facebook BadgePulse: Pulse Beta 5: Whats new in this release? Well to start with we now have Wallbase.cc Authentication! so you can access favorites or NSFW. This version requires .NET 4.0, you probably already have it, but if you don't it's a free and easy download from Microsoft. Pulse can bet set to start on Windows startup now too. The Wallpaper setter has settings now, so you can change the background color of the desktop and the Picture Position (Tile/Center/Fill/etc...) I've switched to Windows Forms instead of WPF...New ProjectsAStar Sample WPF Application by Ben Scharbach: The A* Pathfinding component contains an A* Manager, with three A* path finding engines, allowing for 3 simultaneous path searches on PC and XBOX. - By BenContactor: Programs and Schematics for sending a Short Message Service from a computer.JCI Page: gfdsgfdsgfdsL-Calc: Przykladowy kalkulator liczacy indukcyjnosc poprzez odczyt czestotliwosci obwodu rezonansowego.LibXmlSocket: XmlSocket LibraryNavegar: WPF Navigation pour MVVM Light et SimpleIocNUnit Comparisons: A set of libraries which extend the NUnit constraint framework to support deeper comparisons and report detailed differences useful to test debugging. ORMAC: ORMAC is a micro .NET ORM PersonalDataCenter: PDCNet1Project WarRoom: An experimental chatroom jQuery widget for instant messaging functionality on web applications.Quantum.Net: Quantum.Net is a free computation library developp in C#. Contains some mathematics functions and physical element.Specification Framework: A small framework to get started with a type safe variation of the specification pattern.Sphere Community: Sphere Community Pack 2.0TouchInjector: Generate Windows 8 Touch from TUIO messages.

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  • April 14th Links: ASP.NET, ASP.NET MVC, ASP.NET Web API and Visual Studio

    - by ScottGu
    Here is the latest in my link-listing blog series: ASP.NET Easily overlooked features in VS 11 Express for Web: Good post by Scott Hanselman that highlights a bunch of easily overlooked improvements that are coming to VS 11 (and specifically the free express editions) for web development: unit testing, browser chooser/launcher, IIS Express, CSS Color Picker, Image Preview in Solution Explorer and more. Get Started with ASP.NET 4.5 Web Forms: Good 5-part tutorial that walks-through building an application using ASP.NET Web Forms and highlights some of the nice improvements coming with ASP.NET 4.5. What is New in Razor V2 and What Else is New in Razor V2: Great posts by Andrew Nurse, a dev on the ASP.NET team, about some of the new improvements coming with ASP.NET Razor v2. ASP.NET MVC 4 AllowAnonymous Attribute: Nice post from David Hayden that talks about the new [AllowAnonymous] filter introduced with ASP.NET MVC 4. Introduction to the ASP.NET Web API: Great tutorial by Stephen Walher that covers how to use the new ASP.NET Web API support built-into ASP.NET 4.5 and ASP.NET MVC 4. Comprehensive List of ASP.NET Web API Tutorials and Articles: Tugberk Ugurlu links to a huge collection of articles, tutorials, and samples about the new ASP.NET Web API capability. Async Mashups using ASP.NET Web API: Nice post by Henrik on how you can use the new async language support coming with .NET 4.5 to easily and efficiently make asynchronous network requests that do not block threads within ASP.NET. ASP.NET and Front-End Web Development Visual Studio 11 and Front End Web Development - JavaScript/HTML5/CSS3: Nice post by Scott Hanselman that highlights some of the great improvements coming with VS 11 (including the free express edition) for front-end web development. HTML5 Drag/Drop and Async Multi-file Upload with ASP.NET Web API: Great post by Filip W. that demonstrates how to implement an async file drag/drop uploader using HTML5 and ASP.NET Web API. Device Emulator Guide for Mobile Development with ASP.NET: Good post from Rachel Appel that covers how to use various device emulators with ASP.NET and VS to develop cross platform mobile sites. Fixing these jQuery: A Guide to Debugging: Great presentation by Adam Sontag on debugging with JavaScript and jQuery.  Some really good tips, tricks and gotchas that can save a lot of time. ASP.NET and Open Source Getting Started with ASP.NET Web Stack Source on CodePlex: Fantastic post by Henrik (an architect on the ASP.NET team) that provides step by step instructions on how to work with the ASP.NET source code we recently open sourced. Contributing to ASP.NET Web Stack Source on CodePlex: Follow-on to the post above (also by Henrik) that walks-through how you can submit a code contribution to the ASP.NET MVC, Web API and Razor projects. Overview of the WebApiContrib project: Nice post by Pedro Reys on the new open source WebApiContrib project that has been started to deliver cool extensions and libraries for use with ASP.NET Web API. Entity Framework Entity Framework 5 Performance Improvements and Performance Considerations for EF5:  Good articles that describes some of the big performance wins coming with EF5 (which will ship with both .NET 4.5 and ASP.NET MVC 4). Automatic compilation of LINQ queries will yield some significant performance wins (up to 600% faster). ASP.NET MVC 4 and EF Database Migrations: Good post by David Hayden that covers the new database migrations support within EF 4.3 which allows you to easily update your database schema during development - without losing any of the data within it. Visual Studio What's New in Visual Studio 11 Unit Testing: Nice post by Peter Provost (from the VS team) that talks about some of the great improvements coming to VS11 for unit testing - including built-in VS tooling support for a broad set of unit test frameworks (including NUnit, XUnit, Jasmine, QUnit and more) Hope this helps, Scott

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  • Start Learning Ruby with IronRuby – Setting up the Environment

    - by kazimanzurrashid
    Recently I have decided to learn Ruby and for last few days I am playing with IronRuby. Learning a new thing is always been a fun and when it comes to adorable language like Ruby it becomes more entertaining. Like any other language, first we have to create the development environment. In order to run IronRuby we have to download the binaries form the IronRuby CodePlex project. IronRuby supports both .NET 2.0 and .NET 4, but .NET 4 is the recommended version, you can download either the installation or the zip file. If you download the zip file make sure you added the bin directory in the environment path variable. Once you are done, open up the command prompt and type : ir –v It should print message like: IronRuby 1.0.0.0 on .NET 4.0.30319.1 The ir is 32bit version of IronRuby, if you want to use 64bit you can try ir64. Next, we have to find a editor where we can write our Ruby code as there is currently no integration story of IronRuby with Visual Studio like its twin Iron Python. Among the free IDEs only SharpDevelop has the IronRuby support but it does not have auto complete or debugging built into it, only thing that it supports is the syntax highlighting, so using a text editor which has the same features is nothing different comparing to it. To play with the IronRuby we will be using Notepad++, which can be downloaded from its sourceforge download page. The Notepad++ does have a nice syntax highlighting support : I am using the Vibrant Ink with some little modification. The next thing we have to do is configure the Notepad++ that we can run the Ruby script in IronRuby inside the Notepad++. Lets create a batch(.bat) file in the IronRuby bin directory, which will have the following content: @echo off  cls call ir %1 pause This will make sure that the console will be paused once we run the script. Now click Run->Run in the Notepad++, it will bring up the run dialog and put the following command in the textbox: riir.bat "$(FULL_CURRENT_PATH)" Click the save which will bring another dialog. Type Iron Ruby and assign the shortcut to ctrl + f5 (Same as Visual Studio Start without Debugging) and click ok. Once you are done you will find the IronRuby in the Run menu. Now press ctrl + f5, we will find the ruby script running in the IronRuby. Now there are one last thing that we would like to add which is poor man’s context sensitive help. First, download the ruby language help file from the Ruby Installer site and extract into a directory. Next we will have to install the Language Help Plug-in of Notepad++, click Plugins->Plugin Manger –>Show Plugin Manager and scroll down until you find the plug-in the list, now check the plug-in and click install. Once it is installed it will prompt you to restart the Notepad++, click yes. When the Notepad++ restarts, click the Plugins –> Language Help –> Options –> add and enter the following details and click ok: The chm file location can be different depending upon where you extracted it. Now when you put your in any of ruby keyword and press ctrl + f1 it will take you to the help topic of that keyword. For example, when my caret is in the each of the following code and I press ctrl + f1, it will take me to the each api doc of Array. def loop_demo (1..10).each{ |n| puts n} end loop_demo That’s it for today. Happy Ruby coding.

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  • XNA Notes 008

    - by George Clingerman
    This week has been a rough one. I’ve been sick and then in some kind of slump for my afternoon coding sessions. It could be from the cold, could be I’m still tired from writing that Windows Phone 7 game development book (which is out now!) or it could just be I’m tired of winter and want some sunshine. All I know is that even while I’m stick, the XNA world keeps going along at it’s whirlwind pace. Below are the things I caught in between my coughing fits.. Time Critical XNA News: The 2011 MVP summit is almost here so pass along your feelings and thoughts so the MVPs can take them and share them with the team in person http://forums.create.msdn.com/forums/p/76317/464136.aspx#464136 Dream Build Play - there’s no new announcement yet, but you can’t get much more to the end of February than this! http://www.dreambuildplay.com/Main/Home.aspx XNA Team: Dean Johnson from the XNA team shares an excellent way of handling Guide.IsTrialMode on WP7 http://blogs.msdn.com/b/dejohn/archive/2011/02/21/calling-guide-istrialmode-on-windows-phone-7.aspx Nick Gravelyn tries a new tactic in deciding if there’s enough interest to develop a sequel or not. Don’t YOU want Pixel Man 2 to come out? http://nickgravelyn.com/pixelman2/ XNA MVPs: Andy “The ZMan” Dunn finally shares what he’s been secretly working on these past 4 months http://twitter.com/#!/The_Zman/status/40590269392887808 http://www.youtube.com/watch?v=Rg8Z0ZdYbvg&feature=youtu.be Joel Martinez lets developers around NYC know they should by signing up for Game Hack Day http://twitter.com/joelmartinez/statuses/41118590862102528 http://gamehackday.org/71fdk XNA Developers: Michael McLaughlin shares an XNA RenderTarget2D Sample http://geekswithblogs.net/mikebmcl/archive/2011/02/18/xna-rendertarget2d-sample.aspx Martin Caine starts a new series on Deferred Rendering in XNA 4.0 http://twitter.com/#!/MartinCaine/status/39735221339291648 http://martincaine.com/xna/deferred_rendering_in_xna_4_introduction ElemenyCy posts about his fun time with the IntermediateSerializer http://www.ubergamermonkey.com/xna/holy-bloated-xml-batman/ Ben Kane releases a narrated dev diary video for Project Splice. Let him know if you’d like to see more! (I know I do!) http://twitter.com/#!/benkane/status/39846959498002432 http://www.youtube.com/watch?v=1EmziXZUo08&feature=youtu.be Jason Swearingen (of Novaleaf) posts his part 1 of Spatial Partitioning solutions http://altdevblogaday.org/2011/02/21/spatial-partitioning-part-1-survey-of-spatial-partitioning-solutions/ Brian Lawson of Dark Flow Studios shares what his been up to lately with lots of pretty screenshots and hints of announcements from Microsoft... http://www.darkflowstudios.com/entry/short-and-sweet-part-1 Luke Avery starts a new blog where he plans on making XNA tutorials for beginners (and he’s got a few started already!) http://programmingwithovery.wordpress.com/ Xbox LIVE Indie Games (XBLIG): GameMarx Episode 10 http://www.gamemarx.com/video/the-show/24/ep-10-february-18-2010.aspx Minecraft clone FortressCraft coming to XBLIG http://www.eurogamer.net/articles/2011-02-23-minecraft-clone-fortresscraft-hits-xblig ezMuze+ starts an IndieGoGo fundraiser campaign to help fund their second game and get it onto even more devices! http://www.indiegogo.com/ezmuze Gamergeddon XBLIG round up http://www.gamergeddon.com/2011/02/20/xbox-indie-game-round-up-february-20th/?utm_campaign=twitter&utm_medium=twitter&utm_source=twitter JForce Games loses their Ego http://jforcegames.com/blog/index.php?itemid=121&catid=4 XNA Game Development: @BallerIndustry reminds all XNA developers that the Maths are important ;) http://twitter.com/#!/BallerIndustry/status/39317618280243200 http://www.youtube.com/watch?v=MjV3XDFsjP4&feature=player_embedded#at=106 @suhinini stumbles on an older but extremely useful post on XNA Content Pipeline debugging http://twitter.com/#!/suhinini/status/39270189476352000 http://badcorporatelogo.wordpress.com/2010/10/31/xna-content-pipeline-debugging-4-0/ XNA Game Development Workshops at Singapore Universities http://innovativesingapore.com/2011/02/xna-game-development-workshops-at-singapore-universities/ Indiefreaks announces that IGF v0.3 is out with Xbox 360 support, SunBurn 2.0.12 and it’s now Open Source! http://twitter.com/#!/indiefreaks/status/39391953971982336 @liotral announces a new series on properly designing a game http://twitter.com/#!/liortal53/status/39466905081217024 http://liortalblog.wordpress.com/2011/02/20/hello-cosmos/ Indies and XNA at CodeStock 2011 http://www.gamemarx.com/news/2011/02/20/indies-and-xna-at-codestock-2011.aspx Train Frontier Express posts about XNA Content Hotloading http://trainfrontierexpress.blogspot.com/2011/02/xna-content-hotloading-overview.html Slyprid announces a new character editor in Transmute http://twitter.com/#!/slyprid/status/40146992818696192 http://www.youtube.com/watch?v=OKhFAc78LDs&feature=youtu.be The XNA 2D from the ground up tutorial series http://xna-uk.net/blogs/darkgenesis/archive/2011/02/23/recap-the-xna-2d-from-the-ground-up-tutorial-series.aspx Sgt.Conker posts a “Clingerman” (hey that’s me!) to stay relevant http://www.sgtconker.com/2011/02/posting-a-clingerman-to-stay-relevant/

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  • Silverlight Cream for February 04, 2011 -- #1040

    - by Dave Campbell
    In this Issue: Shawn Wildermuth, John Papa, Jesse Liberty(-2-), Mike Wolf, Matt Casto, Levente Mihály, Roy Dallal, Mark Monster, Andrea Boschin, and Oren Gal. Above the Fold: Silverlight: "Accept and Cancel Buttons Behavior in Silverlight" Matt Casto WP7: "Windows Phone 7 Runtime Debugging" Mike Wolf Shoutouts: Al Pascual announced a get-together if you're going to be in Phoenix on February 10 (next Thursday)... I just can't tell what time it is from the page: Phoenix Dev Meet-Up From SilverlightCream.com: Ten Pet Peeves of WP7 Applications Check out Shawn Wildermuth's Top 10 annoyances when trying out any new app on the WP7... if you're a dev, you might want to keep these in mind. Silverlight TV 60: Checking Out the Zero Gravity Game, Now on Windows Phone 7 John Papa has Silverlight TV number 60 up and this one features Phoenix' own Ryan Plemons discussing the game Zero Gravity and some of the things he had to do to take the game to WP7 ... and the presentation looks as good from here as it did inside the studio :) The Full Stack: Entity Framework To Phone, The Server Side Jesse Liberty and Jon Galloway have Part 6 of their full-stack podcast up ... this is their exploration of MVC3, ASP.NET, Silverlight, and WP7... pair programming indeed! Life Cycle: Page State Management Jesse Liberty also has episode 29 (can you believe that??) of his Windows Phone From Scratch series up ... he's continuing his previous LifeCycle discussion with Page State Management this time. Windows Phone 7 Runtime Debugging Mike Wolf is one of those guys that when he blogs, we should all pay attention, and this post is no exception... he has contributed a run-time diagnostics logger to the WP7Contrib project ... wow... too cool! Accept and Cancel Buttons Behavior in Silverlight Matt Casto has his blog back up and has a behavior up some intuitive UX on ChildWindows by being able to bind to a default or cancel button and have those events activated when the user hits Enter or Escape... very cool, Matt! A classic memory game: Part 3 - Porting the game to Windows Phone 7 Levente Mihály has Part 3 of his tutorial series up at SilverlightShow, and this go-around is porting his 'memory game' to WP7... and this is pretty all-encompassing... Blend for the UI, Performance, and Tombstoning... plus all the source. Silverlight Memory Leak, Part 1 Roy Dallal completely describes how he used a couple easily-downloadable tools to find the root cause of his memory problems with is Silvleright app. Lots of good investigative information. How to cancel the closing of your Silverlight application (in-browser and out-of-browser) Mark Monster revisits a two-year old post of his on cancelling the closing of a Silverlight app... and he's bringing that concept of warning the user the he's about to exit into the OOB situation as well. Windows Phone 7 - Part #3: Understanding navigation Also continuing his WP7 tutorial series on SilverlightShow, Andrea Boschin has part 3 up which is all about Navigation and preserving state... he also has a video on the page to help demonstrate the GoBack method. Multiple page printing in Silverlight 4 Oren Gal built a Silverlight app for last years' ESRI dev summit, and decided to upgrade it this year with functionality such as save/restore, selecting favorite sessions, and printing. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • SQL SERVER – Discard Results After Query Execution – SSMS

    - by pinaldave
    The first thing I do any day is to turn on the computer. Today I woke up and as soon as I turned on the computer I saw a chat message from a friend. He was a bit confused and wanted me to help him. Just as usual I am keeping the relevant conversation in focus and documenting our conversation as chat. Let us call him Ajit. Ajit: Pinal, every time I run a query there is no result displayed in the SSMS but when I run the query in my application it works and returns an appropriate result. Pinal:  Have you tried with different parameters? Ajit: Same thing. However, it works from another computer when I connect to the same server with the same query parameters? Pinal: What? That is new and I believe it is something to do with SSMS and not with the server. Send me screenshot please. Ajit: I believe so, let me send you a screenshot, Pinal: (looking at the screenshot) Oh man, there is no result-tab at all. Ajit: That is what the problem is. It does not have the tab which displays the result. This works just fine from another computer. Pinal: Have you referred Nakul’s blog post – SSMS – Query result options – Discard result after query executes, that talks about setting which can discard the query results after execution. (After a while) Ajit: I think it seems like on the computer where I am running the query my SSMS seems to have the option enabled related to discarding results. I fixed it by following Nakul’s blog post. Pinal: Great! Quite often I get the question what is the importance of the feature. Let us first see how to turn on or turn off this feature in SQL Server Management Studio 2012. In SSMS 2012 go to Tools >> Options >> Query Results > SQL Server >> Results to Grid >> Discard Results After Query Execution. When enabled this option will discard results after the execution. The advantage of disabling the option is that it will improve the performance by using less memory. However the real question is why would someone enable or disable the option. What are the cases when someone wants to run the query but do not care about the result? Matter of the fact, it does not make sense at all to run query and not care about the result. The matter of the fact, I can see quite a few reasons for using this option. I often enable this option when I am doing performance tuning exercise. During performance tuning exercise when I am working with execution plans and do not need results to verify every time or when I am tuning Indexes and its effect on execution plan I do not need the results. In this kind of situations I do keep this option on and discard the results. It always helps me big time as in most of the performance tuning exercise I am dealing with huge amount of the data and dealing with this data can be expensive. Nakul’s has done the experiment here already but I am going to repeat the same again using AdventureWorks Database. Run following T-SQL Script with and without enabling the option to discard the results. USE AdventureWorks2012 GO SELECT * FROM Sales.SalesOrderDetail GO 10 After enabling Discard Results After Query Execution After disabling Discard Results After Query Execution Well, this is indeed a good option when someone is debugging the execution plan or does not want the result to be displayed. Please note that this option does not reduce IO or CPU usage for SQL Server. It just discards the results after execution and a good help for debugging on the development server. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology

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  • career in Mobile sw/Application Development [closed]

    - by pramod
    i m planning to do a course on Wireless & mobile computing.The syllabus are given below.Please check & let me know whether its worth to do.How is the job prospects after that.I m a fresher & from electronic Engg.The modules are- *Wireless and Mobile Computing (WiMC) – Modules* C, C++ Programming and Data Structures 100 Hours C Revision C, C++ programming tools on linux(Vi editor, gdb etc.) OOP concepts Programming constructs Functions Access Specifiers Classes and Objects Overloading Inheritance Polymorphism Templates Data Structures in C++ Arrays, stacks, Queues, Linked Lists( Singly, Doubly, Circular) Trees, Threaded trees, AVL Trees Graphs, Sorting (bubble, Quick, Heap , Merge) System Development Methodology 18 Hours Software life cycle and various life cycle models Project Management Software: A Process Various Phases in s/w Development Risk Analysis and Management Software Quality Assurance Introduction to Coding Standards Software Project Management Testing Strategies and Tactics Project Management and Introduction to Risk Management Java Programming 110 Hours Data Types, Operators and Language Constructs Classes and Objects, Inner Classes and Inheritance Inheritance Interface and Package Exceptions Threads Java.lang Java.util Java.awt Java.io Java.applet Java.swing XML, XSL, DTD Java n/w programming Introduction to servlet Mobile and Wireless Technologies 30 Hours Basics of Wireless Technologies Cellular Communication: Single cell systems, multi-cell systems, frequency reuse, analog cellular systems, digital cellular systems GSM standard: Mobile Station, BTS, BSC, MSC, SMS sever, call processing and protocols CDMA standard: spread spectrum technologies, 2.5G and 3G Systems: HSCSD, GPRS, W-CDMA/UMTS,3GPP and international roaming, Multimedia services CDMA based cellular mobile communication systems Wireless Personal Area Networks: Bluetooth, IEEE 802.11a/b/g standards Mobile Handset Device Interfacing: Data Cables, IrDA, Bluetooth, Touch- Screen Interfacing Wireless Security, Telemetry Java Wireless Programming and Applications Development(J2ME) 100 Hours J2ME Architecture The CLDC and the KVM Tools and Development Process Classification of CLDC Target Devices CLDC Collections API CLDC Streams Model MIDlets MIDlet Lifecycle MIDP Programming MIDP Event Architecture High-Level Event Handling Low-Level Event Handling The CLDC Streams Model The CLDC Networking Package The MIDP Implementation Introduction to WAP, WML Script and XHTML Introduction to Multimedia Messaging Services (MMS) Symbian Programming 60 Hours Symbian OS basics Symbian OS services Symbian OS organization GUI approaches ROM building Debugging Hardware abstraction Base porting Symbian OS reference design porting File systems Overview of Symbian OS Development – DevKits, CustKits and SDKs CodeWarrior Tool Application & UI Development Client Server Framework ECOM STDLIB in Symbian iPhone Programming 80 Hours Introducing iPhone core specifications Understanding iPhone input and output Designing web pages for the iPhone Capturing iPhone events Introducing the webkit CSS transforms transitions and animations Using iUI for web apps Using Canvas for web apps Building web apps with Dashcode Writing Dashcode programs Debugging iPhone web pages SDK programming for web developers An introduction to object-oriented programming Introducing the iPhone OS Using Xcode and Interface builder Programming with the SDK Toolkit OS Concepts & Linux Programming 60 Hours Operating System Concepts What is an OS? Processes Scheduling & Synchronization Memory management Virtual Memory and Paging Linux Architecture Programming in Linux Linux Shell Programming Writing Device Drivers Configuring and Building GNU Cross-tool chain Configuring and Compiling Linux Virtual File System Porting Linux on Target Hardware WinCE.NET and Database Technology 80 Hours Execution Process in .NET Environment Language Interoperability Assemblies Need of C# Operators Namespaces & Assemblies Arrays Preprocessors Delegates and Events Boxing and Unboxing Regular Expression Collections Multithreading Programming Memory Management Exceptions Handling Win Forms Working with database ASP .NET Server Controls and client-side scripts ASP .NET Web Server Controls Validation Controls Principles of database management Need of RDBMS etc Client/Server Computing RDBMS Technologies Codd’s Rules Data Models Normalization Techniques ER Diagrams Data Flow Diagrams Database recovery & backup SQL Android Application 80 Hours Introduction of android Why develop for android Android SDK features Creating android activities Fundamental android UI design Intents, adapters, dialogs Android Technique for saving data Data base in Androids Maps, Geocoding, Location based services Toast, using alarms, Instant messaging Using blue tooth Using Telephony Introducing sensor manager Managing network and wi-fi connection Advanced androids development Linux kernel security Implement AIDL Interface. Project 120 Hours

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  • Issues printing through ssh tunnel and port forwarding

    - by simogasp
    I'm having some problems trying to print through a ssh tunnel. I'd like to print from my laptop to a network printer (Toshiba es453, for what matters) which is in a local network. I can reach the local network using a gateway. So far I did the following: ssh -N -L19100:<Printer_IP>:9100 <username>@<ssh_gateway> Basically i just mapped the port 19100 of my laptop directly to the input port of the printer, passing through the gateway. So far, so good. Then, i tried to install on my laptop a new printer with the GUI config tool of ubuntu, so that the new printer is on localhost at port 19100 (as APP Socket/HP Jet Direct) , then I provided the proper driver of the printer. In theory, once the tunnel is open I should be able to print from any program just selecting this printer. Of course, it does not work. :-) The document hangs in the queue with status Processing while in the shell where I set up the tunnel I get these errors on failing opening channels debug1: Local forwarding listening on ::1 port 19100. debug1: channel 0: new [port listener] debug1: Local forwarding listening on 127.0.0.1 port 19100. debug1: channel 1: new [port listener] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Connection to port 19100 forwarding to 195.220.21.227 port 9100 requested. debug1: channel 2: new [direct-tcpip] debug1: Connection to port 19100 forwarding to 195.220.21.227 port 9100 requested. debug1: channel 3: new [direct-tcpip] channel 2: open failed: connect failed: Connection timed out debug1: channel 2: free: direct-tcpip: listening port 19100 for 195.220.21.227 port 9100, connect from ::1 port 44434, nchannels 4 debug1: Connection to port 19100 forwarding to 195.220.21.227 port 9100 requested. debug1: channel 2: new [direct-tcpip] channel 3: open failed: connect failed: Connection timed out debug1: channel 3: free: direct-tcpip: listening port 19100 for 195.220.21.227 port 9100, connect from ::1 port 44443, nchannels 4 channel 2: open failed: connect failed: Connection timed out debug1: channel 2: free: direct-tcpip: listening port 19100 for 195.220.21.227 port 9100, connect from ::1 port 44493, nchannels 3 debug1: Connection to port 19100 forwarding to 195.220.21.227 port 9100 requested. debug1: channel 2: new [direct-tcpip] As a further debugging test I tried the following. From a machine inside the local network I did a telnet <IP_printer> 9100, got access, wrote some random thing, closed the connection and correctly I got a print of what I had written. So the port and the ip of the printer should be correct. I tried the same from my laptop with the tunnel opened, the telnet succeeded but, again, the printer didn't print anything, getting the usual channel x: open failed: errors. I'm not a great expert on the matter, I just thought that in theory it was possible to do something like that, but maybe there is something that I didn't consider or I did wrong. Any clue? Thanks! Simone [update] As further debugging test, I tried to replicate the procedure from a machine in the local network. From that machine, I did ssh -N -L19100:<IP_printer>:9100 <username>@<ssh_gateway> (note that now the machine, the gateway and the printer are in the same local network) then I tried again the telnet test with telnet localhost 19100, I got access and everything, but I didn't get the print but the usual error channel 2: open failed: connect failed: Connection timed out Maybe I am missing some other connection to be forwarded or maybe this is not allowed by the administrators. Of course, if I connect via ssh tunneling to the local machine from my laptop through the gateway, I can successfully print using the lpr command (from the local machine). But this is what I would like to avoid (yes, I'm lazy...:-), I would like to have a more 'elegant' and transparent way to do that.

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  • Dont Throw Duplicate Exceptions

    In your code, youll sometimes have write code that validates input using a variety of checks.  Assuming you havent embraced AOP and done everything with attributes, its likely that your defensive coding is going to look something like this: public void Foo(SomeClass someArgument) { if(someArgument == null) { throw new InvalidArgumentException("someArgument"); } if(!someArgument.IsValid()) { throw new InvalidArgumentException("someArgument"); }   // Do Real Work } Do you see a problem here?  Heres the deal Exceptions should be meaningful.  They have value at a number of levels: In the code, throwing an exception lets the develop know that there is an unsupported condition here In calling code, different types of exceptions may be handled differently At runtime, logging of exceptions provides a valuable diagnostic tool Its this last reason I want to focus on.  If you find yourself literally throwing the exact exception in more than one location within a given method, stop.  The stack trace for such an exception is likely going to be identical regardless of which path of execution led to the exception being thrown.  When that happens, you or whomever is debugging the problem will have to guess which exception was thrown.  Guessing is a great way to introduce additional problems and/or greatly increase the amount of time require to properly diagnose and correct any bugs related to this behavior. Dont Guess Be Specific When throwing an exception from multiple code paths within the code, be specific.  Virtually ever exception allows a custom message use it and ensure each case is unique.  If the exception might be handled differently by the caller, than consider implementing a new custom exception type.  Also, dont automatically think that you can improve the code by collapsing the if-then logic into a single call with short-circuiting (e.g. if(x == null || !x.IsValid()) ) that will guarantee that you cant easily throw different information into the message as easily as constructing the exception separately in each case. The code above might be refactored like so:   public void Foo(SomeClass someArgument) { if(someArgument == null) { throw new ArgumentNullException("someArgument"); } if(!someArgument.IsValid()) { throw new InvalidArgumentException("someArgument"); }   // Do Real Work } In this case its taking advantage of the fact that there is already an ArgumentNullException in the framework, but if you didnt have an IsValid() method and were doing validation on your own, it might look like this: public void Foo(SomeClass someArgument) { if(someArgument.Quantity < 0) { throw new InvalidArgumentException("someArgument", "Quantity cannot be less than 0. Quantity: " + someArgument.Quantity); } if(someArgument.Quantity > 100) { throw new InvalidArgumentException("someArgument", "SomeArgument.Quantity cannot exceed 100. Quantity: " + someArgument.Quantity); }   // Do Real Work }   Note that in this last example, Im throwing the same exception type in each case, but with different Message values.  Im also making sure to include the value that resulted in the exception, as this can be extremely useful for debugging.  (How many times have you wished NullReferenceException would tell you the name of the variable it was trying to reference?) Dont add work to those who will follow after you to maintain your application (especially since its likely to be you).  Be specific with your exception messages follow DRY when throwing exceptions within a given method by throwing unique exceptions for each interesting case of invalid state. Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Libgdx 2D Game, Random generated World of random size, how to get mouse coordinates?

    - by Solom
    I'm a noob and English is not my mothertongue, so please bear with me! I'm generating a map for a Sidescroller out of a 2D-array. That is, the array holds different values and I create blocks based on that value. Now, my problem is to match mouse coordinates on screen with the actual block the mouse is pointing at. public class GameScreen implements Screen { private static final int WIDTH = 100; private static final int HEIGHT = 70; private OrthographicCamera camera; private Rectangle glViewport; private Spritebatch spriteBatch; private Map map; private Block block; ... @Override public void show() { camera = new OrthographicCamera(WIDTH, HEIGHT); camera.position.set(WIDTH/2, HEIGHT/2, 0); glViewport = new Rectangle(0, 0, WIDTH, HEIGHT); map = new Map(16384, 256); map.printTileMap(); // Debugging only spriteBatch = new SpriteBatch(); } @Override public void render(float delta) { // Clear previous frame Gdx.gl.glClearColor(1, 1, 1, 1 ); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); GL30 gl = Gdx.graphics.getGL30(); // gl.glViewport((int) glViewport.x, (int) glViewport.y, (int) glViewport.width, (int) glViewport.height); spriteBatch.setProjectionMatrix(camera.combined); camera.update(); spriteBatch.begin(); // Draw Map this.drawMap(); // spriteBatch.flush(); spriteBatch.end(); } private void drawMap() { for(int a = 0; a < map.getHeight(); a++) { // Bounds check (y) if(camera.position.y + camera.viewportHeight < a)// || camera.position.y - camera.viewportHeight > a) break; for(int b = 0; b < map.getWidth(); b++) { // Bounds check (x) if(camera.position.x + camera.viewportWidth < b)// || camera.position.x > b) break; // Dynamic rendering via BlockManager int id = map.getTileMap()[a][b]; Block block = BlockManager.map.get(id); if(block != null) // Check if Air { block.setPosition(b, a); spriteBatch.draw(block.getTexture(), b, a, 1 ,1); } } } } As you can see, I don't use the viewport anywhere. Not sure if I need it somewhere down the road. So, the map is 16384 blocks wide. One block is 16 pixels in size. One of my naive approaches was this: if(Gdx.input.isButtonPressed(Input.Buttons.LEFT)) { Vector3 mousePos = new Vector3(); mousePos.set(Gdx.input.getX(), Gdx.input.getY(), 0); camera.unproject(mousePos); System.out.println(Math.round(mousePos.x)); // *16); // Debugging // TODO: round // map.getTileMap()[mousePos.x][mousePos.y] = 2; // Draw at mouse position } I confused myself somewhere down the road I fear. What I want to do is, update the "block" (or rather the information in the Map/2D-Array) so that in the next render() there is another block. Basically drawing on the spriteBatch g So if anyone could point me in the right direction this would be highly appreciated. Thanks!

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  • Application Logging needs work

    Application Logging Application logging is the act of logging events that occur within an application much like how a court report documents what happens in court case. Application logs can be useful for several reasons, but the most common use for logs is to recreate steps to find the root cause of applications errors. Other uses can include the detection of Fraud, verification of user activity, or provide audits on user/data interactions. “Logs can contain different kinds of data. The selection of the data used is normally affected by the motivation leading to the logging. “ (OWASP, 2009) OWASP also stats that logging include applicable debugging information like the event date time, responsible process, and a description of the event. “There are many reasons why a logging system is a necessary part of delivering a distributed application. One of the most important is the ability to track exactly how many users are using the application during different time periods.” (Hatton, 2000) Hatton also states that application logging helps system designers determine whether parts of an application aren't being used as designed. He implies that low usage can be used to identify if users like or do not like aspects of a system based on user usage of the application. This enables application designers to extract why users don't like aspects of an application so that changes can be made to increase its usefulness and effectiveness. “Logging memory usage can also assist you in tuning up the internals of your application. If you're experiencing a randomly occurring problem, being able to match activities performed with the memory status at the time may enable you to discover the cause of the problem. It also gives you a good indication of the health of the distributed server machine at the time any activity is performed. “ (Hatton, 2000) Commonly Logged Application Events (Defined by OWASP) Access of Data Creation of Data Modification of Data in any form Administrative Functions  Configuration Changes Debugging Information(Application Events)  Authorization Attempts  Data Deletion Network Communication  Authentication Events  Errors/Exceptions Application Error Logging The functionality associated with application error logging is actually the combination of proper error handling and applications logging.  If we look back at Figure 4 and Figure 5, these code examples allow developers to handle various types of errors that occur within the life cycle of an application’s execution. Application logging can be applied within the Catch section of the TryCatch statement allowing for the errors to be logged when they occur. By placing the logging within the Catch section specific error details can be accessed that help identify the source of the error, the path to the error, what caused the error and definition of the error that occurred. This can then be logged and reviewed at a later date in order recreate the error that was received based data found in the application log. By allowing applications to log errors developers IT staff can use them to recreate errors that are encountered by end-users or other dependent systems.

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