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• NSFileCoordinator correct usage

  - by Johannes

  when writing a file using NSFileCoordinator i need to specify to correct NSFileCoordinatorWritingOptions. Although they are explained in detail, i am not sure when to use which one. The available options are: NSFileCoordinatorWritingForDeleting NSFileCoordinatorWritingForReplacing NSFileCoordinatorWritingForMoving NSFileCoordinatorWritingForMerging For example, what option is the correct one if i want to create a file(a plist for example)? Wich one when i modify a file? Can someone explain the NSFileCoordinatorWritingOptions for a better understanding? Greetings, Johannes

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• How to draw a diary in swt

  - by Johannes

  Hey, I am searching for a good mode to develop a application which shows 7 days and 24 hours (weekly view), knows somebody if there is a good tutorial? Or which layout would you use to design this? It should be possible to add events with a beginning and ending time... Thanks in advance Johannes

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• Does software testing methodology rely on flawed data?

  - by Konrad Rudolph

  It’s a well-known fact in software engineering that the cost of fixing a bug increases exponentially the later in development that bug is discovered. This is supported by data published in Code Complete and adapted in numerous other publications. However, it turns out that this data never existed. The data cited by Code Complete apparently does not show such a cost / development time correlation, and similar published tables only showed the correlation in some special cases and a flat curve in others (i.e. no increase in cost). Is there any independent data to corroborate or refute this? And if true (i.e. if there simply is no data to support this exponentially higher cost for late discovered bugs), how does this impact software development methodology?

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• Why a static main method in Java and C#, rather than a constructor?

  - by Konrad Rudolph

  Why did (notably) Java and C# decide to have a static method as their entry point – rather than representing an application instance by an instance of an Application class, with the entry point being an appropriate constructor which, at least to me, seems more natural? I’m interested in a definitive answer from a primary or secondary source, not mere speculations. This has been asked before. Unfortunately, the existing answers are merely begging the question. In particular, the following answers don’t satisfy me, as I deem them incorrect: There would be ambiguity if the constructor were overloaded. – In fact, C# (as well as C and C++) allows different signatures for Main so the same potential ambiguity exists, and is dealt with. A static method means no objects can be instantiated before so order of initialisation is clear. – This is just factually wrong, some objects are instantiated before (e.g. in a static constructor). So they can be invoked by the runtime without having to instantiate a parent object. – This is no answer at all. Just to justify further why I think this is a valid and interesting question: Many frameworks do use classes to represent applications, and constructors as entry points. For instance, the VB.NET application framework uses a dedicated main dialog (and its constructor) as the entry point1. Neither Java nor C# technically need a main method. Well, C# needs one to compile, but Java not even that. And in neither case is it needed for execution. So this doesn’t appear to be a technical restriction. And, as I mentioned in the first paragraph, for a mere convention it seems oddly unfitting with the general design principle of Java and C#. To be clear, there isn’t a specific disadvantage to having a static main method, it’s just distinctly odd, which made me wonder if there was some technical rationale behind it. I’m interested in a definitive answer from a primary or secondary source, not mere speculations. 1 Although there is a callback (Startup) which may intercept this.

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• Go up one directory in mod_rewrite

  - by Rudolph Gottesheim

  I've got a standard Zend Framework 1 project that looks a bit like this: Project |- public |- .htaccess |- index.php The .htaccess looks like this: RewriteEngine On RewriteBase / RewriteRule ^image/.*$ img.php?file=$1 [NC,L] RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] Now I want to start transitioning the site to Zend Framework 2, which I put in a separate directory in the root, so the whole thing looks like this: Project |- public |- .htaccess |- index.php |- zf2 |- public |- .htaccess |- index.php What would I have to change in my original (ZF1) .htaccess to route all requests to (for example) /zf2/whatever to ZF2's index.php? I've tried RewriteRule ^zf2(/.*)$ ../zf2/public/index.php [NC,L] in the line after RewriteBase /, but that just gives me a 400 Bad Request.

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• What does seem target in ANT

  - by Johannes

  Hello I am completly new to eclipse, liferay and ANT. I tried to set up a development environment and just finished the ext-anvironment (I also executed ant clean start). Now I've to execute "ant build-ext", following this tutorial: http://www.liferay.com/web/guest/community/wiki/-/wiki/Main/Setting%20up%20the%20Extension%20Environment D:\_liferay\ext>ant build-ext Buildfile: D:\_liferay\ext\build.xml But I receive the Message: BUILD FAILED Target "build-ext" does not exist in the project "ext". Can somebody tell me what I did wrong? Thanks in Advance Johannes

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• Why can't I reinstall MySQL?

  - by Johannes Nielsen

  I've been looking all around the Internet for an answer but didn't find anything. I hope you can help me now. I have a server with MySQL. From one day to another, MySQL didn't let me enter with my root password anymore (accsess denied for user 'root'@'localhost' using password: 'YES'). So I tried two ways to reset the password: No.1: I typed: shell> /etc/init.d/mysqld stop To stop MySQL. Then I restarted it skipping the grant-tables: shell> mysqld_safe --skip-grant-tables So I was able to log in as root and change the password using: mysql> UPDATE mysql.user SET Password = PASSWORD('MyNewPassword') WHERE User = 'root'; FLUSH PRIVILEGES; I restarted MySQL and tried to log in as root with my new password - didn't work. So I tried the solution that's described here: http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html (I don't want to post it here because this post is already pretty long). Didn't work either. Actually it made it worse, because since that day, every time I try to start MySQL, it doesn't even ask me for my password, but I get: shell> ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) Well, I've looked up what it means and found that my mysqld.sock is missing. I tried to create it using touch but MySQL can't start with that socket. Now I'm trying to reinstall MySQL but everytime I type in shell> apt-get --purge remove mysql-server mysql-common mysql-client In that or any other order or every one of those three alone, I get: shell> Reading package lists... Done shell> Building dependency tree shell> Reading state information... Done shell> Package mysql-client is not installed, so not removed shell> Package mysql-server is not installed, so not removed shell> You might want to run 'apt-get -f install' to correct these: shell> The following packages have unmet dependencies: shell> libmysqlclient18 : Depends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> libmysqlclient18:i386 : Depends: mysql-common:i386 (>= 5.5.28-0ubuntu0.12.04.2) shell> mysql-client-5.5 : Depends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> mysql-server-5.5 : PreDepends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> psa-firewall : Depends: plesk-core (>= 11.0.9) but it is not installable shell> Depends: mysql-server but it is not going to be installed shell> psa-spamassassin : Depends: plesk-core (>= 11.0.9) but it is not installable shell> psa-vpn : Depends: plesk-core (>= 11.0.9) but it is not installable shell> Depends: plesk-base (>= 11.0.9) but it is not installable shell> Depends: mysql-server but it is not going to be installed shell> E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). So I said to my self "let's just remove those files with depenencies, too" (that psa-stuff since plesk is virtual and can't be uninstalled)... Guess what happened: shell> Reading package lists... Done shell> Building dependency tree shell> Reading state information... Done shell> Package mysql-client is not installed, so not removed shell> Package mysql-server is not installed, so not removed shell> You might want to run 'apt-get -f install' to correct these: shell> The following packages have unmet dependencies: shell> libmysqlclient18 : Depends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> libmysqlclient18:i386 : Depends: mysql-common:i386 (>= 5.5.28-0ubuntu0.12.04.2) shell> mysql-client-5.5 : Depends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> mysql-server-5.5 : PreDepends: mysql-common (>= 5.5.28-0ubuntu0.12.04.2) but it is not going to be installed shell> E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). Of course I tried apt-get -f install, too many times even. What am I doing wrong? No matter, which other packages I include into apt-get --purge remove, I always get new dependencies. Do I have to delete every MySQL-related directory and file manually? Hope there's someone out there who can help me! Cheers! EDIT: After trying apt-get purge mysql-server mysql-common mysql-client libmysqlclient18 libmysqlclient18:i386 mysql-client-5.5 mysql-server-5.5 psa-firewall psa-spamassassin psa-vpn Reading package lists... Done Building dependency tree Reading state information... Done Package mysql-client is not installed, so not removed Package mysql-server is not installed, so not removed You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: libdbd-mysql-perl : Depends: libmysqlclient18 (>= 5.5.13-1) but it is not going to be installed libmyodbc : Depends: libmysqlclient18 (>= 5.5.13-1) but it is not going to be installed libqt4-sql-mysql:i386 : Depends: libmysqlclient18:i386 (>= 5.5.13-1) but it is not going to be installed php5-mysql : Depends: libmysqlclient18 (>= 5.5.13-1) but it is not going to be installed ruby-mysql : Depends: libmysqlclient18 (>= 5.5.13-1) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). So I tried to remove all these and got: Building dependency tree Reading state information... Done Package mysql-client is not installed, so not removed Package mysql-server is not installed, so not removed You might want to run 'apt-get -f install' to correct these:qlclient18:i386 mysql The following packages have unmet dependencies: libmysql-ruby1.8 : Depends: ruby-mysql but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). And actually I think removing that file, too solved my problem :-S Next time I'll try everything before asking :D Thank you Eric for keeping me couraged to just go on removing :D

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• Cannot connect my Ubuntu to TV with HDMI

  - by Hannes Johannes

  Another problem in my way to Ubuntu world.. Trying to make things work Linux way, day 4, problem #5321: I have a Compaq laptop and Nvidia graphic adapter. I also have Panasonic TV, which I thought I could use as a second screen just like I used to to when I was still using Windows Vista with my laptop. Plug the screen to the comp and voilá, I can watch my videos on big screen. And a boll***s I can, not with ubuntu anyways. Nvidia x server (or whatever it's called) does recognize my tv. It's very badly designed gui as I can never be sure has it saved my changes or not (most often not), but I recon I've got that one sorted out. I haven't found a way to set a primary monitor there, but it does see there are two monitors, my laptop and the tv. So far so good. But then? Ubuntu's own monitor setting only sees the laptop screen. If I reboot (with the HDMI cable connected) I end up having a black screen. Then I have to take the cable away, cut the power off and restart the comp.. Please, help, any help would be appreciated! I would so much love to like this linux more than windows but it surely takes a lot of trying...

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• How to register an agent with launchd

  - by Konrad Rudolph

  I’m unable to schedule a periodic launch with launchctl/launchd on OS X (Leopard). Basically, I’m unable to find a step-by-step list of instructions on the web and the intuitive approach doesn’t work. The sync.plist file: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>net.madrat.utils.sync</string> <key>Program</key> <string>rsync</string> <key>ProgramArguments</key> <array> <string>-ar</string> <string>/path/to/folder/</string> <string>/path/to/backup/</string> </array> <key>StartInterval</key> <integer>7200</integer> </dict> </plist> I’ve put this script inside the path ~/Library/LaunchAgents. Next, I’ve registered the script using launchctl load ~/Library/LaunchAgents/sync.plist Finally, to test that it works, I started the job: launchctl start net.madrat.utils.sync – Nothing happened. Manually executing the rsync command in the terminal yields the expected result. I’m fairly sure that the job was registered correctly because if I try to start a non-existing job, I get an error message (which I didn’t get in the above command). What did I do wrong?

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• How to tunnel a local port onto a remote server

  - by Trevor Rudolph

  I have a domain that i bought from DynDNS. I pointed the domain at my ip adress so i can run servers. The problem I have is that I don't live near the server computer... Can I use an ssh tunnel? As I understand it, this will let me access to my servers. I want the remote computer to direct traffic from port 8080 over the ssh tunnel to the ssh client, being my laptop's port 80. Is this possible? EDIT: verbose output of tunnel macbookpro:~ trevor$ ssh -R *:8080:localhost:80 -N [email protected] -v OpenSSH_5.2p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /Users/trevor/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: Connecting to site.com [remote ip address] port 22. debug1: Connection established. debug1: identity file /Users/trevor/.ssh/identity type -1 debug1: identity file /Users/trevor/.ssh/id_rsa type -1 debug1: identity file /Users/trevor/.ssh/id_dsa type 2 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'site.com' is known and matches the RSA host key. debug1: Found key in /Users/trevor/.ssh/known_hosts:9 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/trevor/.ssh/identity debug1: Trying private key: /Users/trevor/.ssh/id_rsa debug1: Offering public key: /Users/trevor/.ssh/id_dsa debug1: Authentications that can continue: publickey,password debug1: Next authentication method: password [email protected]'s password: debug1: Authentication succeeded (password). debug1: Remote connections from *:8080 forwarded to local address localhost:80 debug1: Requesting [email protected] debug1: Entering interactive session. debug1: remote forward success for: listen 8080, connect localhost:80 debug1: All remote forwarding requests processed

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• Difference between XeTeX and LuaTeX

  - by Konrad Rudolph

  I have a hard time contrasting XeTeX and LuaTeX. At the moment, I am using XeTeX almost exclusively, mainly because it uses UTF-8 as the native input encoding and because it supports TTF and OTF fonts. However, the lack of support for pdftex’ microtyping is mildly annoying. LuaTeX, on the other hand, does support this, as well as UTF-8 input and (rudimentary?) fontspec support. So my question boils down to: Is there any advantage in using XeTeX over using LuaTeX? Has anybody used both and can compare them? In particular, LuaTeX sounds very experimental and unstable – but is this really the case?

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• Why does my MySQL remote-connection fail (VLAN)?

  - by Johannes Nielsen

  ubuntu-community! Again I have a problem with my special friend MySQL :D I have got two servers - a database-server and a web-server - who are connected via VLAN. Now I want the web-server to have remote access to the database-server's MySQL. So I created the user user in mysql.user. user's Host is xxx.yyy.zzz.9 which is the internal IP-address of the web-server. xxx.yyy.zzz.0 is the network. I also created user with Host % . As long as I use MySQL on the database-server logging in as user, everything works fine. But trying to log in as user from xxx.yyy.zzz.9 using mysql -h xxx.yyy.zzz.8 -u user -p (where xxx.yyy.zzz.8 is the database-server's internal IP), I get ERROR 2003 (HY000): Can't connect to MySQL server on 'xxx.yyy.zzz.8' (110) So I tried to activate Bind-Address in the my.cnf file. Well, if I use xxx.yyy.zzz.8, nothing changes. But if I try xxx.yyy.zzz.9 and try to restart MySQL, I get mysql stop/waiting start: Job failed to start I checked the log files and found - nothing. The database-server's MySQL doesn't even register, that the web-server tries to connect remotely. My idea is, that maybe I didn't configure the VLAN properley, even though I asked someone who actually knows such stuff and he told me, I did everything right. What I wrote into /etc/networking/interfaces is: #The VLAN auto eth1 iface eth1 inet static address xxx.yyy.zzz..8 netmask 255.255.255.0 network xxx.yyy.zzz.0 broadcast xxx.yyy.zzz.255 mtu 1500 ifconfig returns eth1 Link encap:Ethernet HWaddr xxxxxxxxxxxxxx inet addr:xxx.yyy.zzz.8 Bcast:xxx.yyy.zzz.255 Mask:255.255.255.0 inet6 addr: xxxxxxxxxxxxxxx/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:241146 errors:0 dropped:0 overruns:0 frame:0 TX packets:9765 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:17825995 (17.8 MB) TX bytes:566602 (566.6 KB) Memory:fb900000-fb920000 for the eth1, what is, what I configured. (This is for the database-server, the web-server looks similar). ethtool eth1 returns: Settings for eth1: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 100Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000003 (3) drv probe Link detected: yes (This is for the database-server, the web-server looks similar). Actually I think, everything is right, but it still doesn't work. Is there someone with an idea? EDIT: I commented ou Bind-Address in my.cnf after it didn't work.

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• Is INT_MIN-1 an underflow or overflow?

  - by Johannes Schaub - litb

  I seem to remember that I was reading that underflow means you have a too small magnitude that cannot be presented anymore in a type overflow means you have a too large magnitude that cannot be presented anymore in a type However, in practice I perceive that the terms are used such that underflow means you have a too small value that cannot be presented anymore in a type overflow means you have a too large value that cannot be presented anymore in a type What is the correct meaning to use here? Are the terms defined differently for integer and floating point types?

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• Windows 8 won't boot after Boot Repair

  - by Rudolph Gottesheim

  I've got a Sony Vaio laptop. Until yesterday I had Windows 7 and Ubuntu 12.04 installed. Today I upgraded to Windows 8, which killed my OS selection screen. So I booted to Ubuntu 12.10 from a USB stick and ran Boot Repair. This recovered the GRUB screen and let me boot into my Ubuntu 12.04 installation, but now I can' boot Windows 8. When I select the option that booted Windows 7 before, it looks like it wants to start Windows 7 (sic) again (black screen, with the text "Windows is loading" or something), but then reboots the machine after a few seconds. I'm sure Boot Repair can fix this, but I know far too little about the whole booting thing to know the right settings for it. Here's my boot repair report thing.

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• Troubleshooting an unstable internet connection

  - by Konrad Rudolph

  My MacBook Pro running OS X (10.9, but I had the same problem before) is connected to a Belkin router via WiFi and, using Virgin Media as the ISP, to the internet. The connection is extremely unstable – on some days, I get a ping timeout every few seconds. In addition, some domains seem to suffer general connectivity issues. For instance, I often find that while the youtube.com website loads, none of the videos (which are hosted on a separate domain) do. At other times, videos load but always fail to buffer, even though the actual connection speed is ok, even though I’ve disabled dash playback. Since I’m living in a rented room and the ISP contract isn’t actually mine I’ve got only limited possibilities of addressing the problem. In particular, I have no access to the router configuration and my non tech savvy landlady, while sympathetic, is not in a great hurry to hand the problem over to the ISP’s customer support. What’s more, I seem to be the only person in the house experiencing these problems – but I can imagine that this is simply because I’m the only one who’s using the internet continuously. I’m searching for specific tests that might be able to pinpoint – and ideally solve – the problem. So far all I’ve managed to do is establish that Virgin is routing my traffic in mysterious ways. Here’s an excerpt from traceroute google.co.uk. It’s worth mentioning that the host name doesn’t seem to matter a lot, the trace route is always the same. traceroute: Warning: google.co.uk has multiple addresses; using 62.254.36.148 traceroute to google.co.uk (62.254.36.148), 64 hops max, 52 byte packets 1 (192.168.2.1) 1.112 ms 1.300 ms 2.359 ms 2 10.100.32.1 (10.100.32.1) 11.926 ms 10.217 ms 24.987 ms 3 cmbg-core-1a-ae3-610.network.virginmedia.net (80.1.202.93) 28.809 ms * 66.653 ms 4 popl-bb-1b-ae16-0.network.virginmedia.net (212.43.163.141) 13.759 ms 126.504 ms 20.472 ms 5 nrth-bb-1b-et-010-0.network.virginmedia.net (62.253.175.57) 28.357 ms 16.398 ms 42.387 ms 6 nrth-bb-1c-ae1-0.network.virginmedia.net (62.253.174.110) 27.441 ms 15.622 ms 12.044 ms 7 lutn-icdn-1-ae0-0.network.virginmedia.net (62.253.175.82) 16.678 ms 28.463 ms 28.253 ms 8 * * * 9 * * * 10 * * * ^C If I let it, this goes on until the end of time. It never seems to reach a destination. Is this normal? A friend living in the same town who is also with Virgin Media has a more conventional traceroute output: 7 hops to google.co.uk, all of which send the ICMP TIME_EXCEEDED response. The obvious fix – rebooting the router – doesn’t seem to help. As far as I can tell, the WiFi connection is stable (I can always ping the router) so the problem is further downstream. I’ve tried using an alternative DNS before (OpenDNS) but if anything, this made things worse. In fact, it made all Google services nigh unreachable.

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• as3 3D camera lookat

  - by Johannes Jensen

  I'm making a 3D camera scene in Flash, draw using drawTriangles() and rotated and translated using a Matrix3D. I've got the camera to look after a specific point, but only on the Y-axis, using the x and z coordinates, here is my code so far: var dx:Number = camera.x - lookAt.x; var dy:Number = camera.y - lookAt.y; var dz:Number = camera.z - lookAt.z; camera.rotationY = Math.atan2(dz, dx) * (180 / Math.PI) + 270; so no matter the x or z position, the point is always on the mid of the screen, IF and only if y matches with the camera. So what I need is to calculate the rotationX (which are measured in degrees not radians), and I was wondering how I would do this?

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• C++ Library API Design

  - by johannes

  I'm looking for a good resource for learning about good API design for C++ libraries, looking at shared objects/dlls etc. There are many resources on writing nice APIs, nice classes, templates and so on at source level, but barely anything about putting things together in shared libs and executables. Books like Large-Scale C++ Software Design by John Lakos are interesting but massively outdated. What I'm looking for is advice i.e. on handling templates. With templates in my API I often end up with library code in my executable (or other library) so if I fix a bug in there I can't simply roll out the new library but have to recompile and redistribute all clients of that code. (and yes, I know some solutions like trying to instantiate at least the most common versions inside the library etc.) I'm also looking for other caveats and things to mind for keeping binary compatibility while working on C++ libraries. Is there a good website or book on such things?

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• favored keyboard layout keeps being replaced

  - by Johannes Bauer

  My Ubuntu was installed with only a German keyboard layout configured. I much prefer the English UK (extended WinKeys) layout and therefore added that option. However, the selected keyboard layout kept reverting to German seemingly at random, and so I removed it through the layout indicator's preferences dialog. Strangely that didn't help: every now and then the English keyboard layout is replaced by the German one and that change shows up in the layout indicator. I guess the unwanted layout must still be configured somewhere and I must be hitting some key combination to switch to it. But the preferences dialog for the layout indicator doesn't show any such combination. I'm on Ubuntu 12.04 and I'm using Xfce 4.8. PS: This is similar but not the same as this or this issue: when I log in, the correct layout is usually selected (and only that layout is configured). The layout is changed completely at random while I'm working.

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• Acer Allionone Z5810 Touchscreen Issues 12.04

  - by Johannes

  I have an Acer Allionone Z5810, and I can't get the touchscreen to work after I install 12.04. Here is the lsusb output: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 003: ID 0596:0508 MicroTouch Systems, Inc. Bus 001 Device 004: ID 04b8:0005 Seiko Epson Corp. Printer Bus 001 Device 005: ID 07ca:1336 AVerMedia Technologies, Inc. Bus 002 Device 003: ID 04ca:0058 Lite-On Technology Corp. Bus 002 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) Bus 002 Device 005: ID 04f2:b23f Chicony Electronics Co., Ltd xinput --list Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? Lite-On Technology Corp. Wireless Device id=9 [slave pointer (2)] ? ? Lite-On Technology Corp. Wireless Device id=10 [slave pointer (2)] ? Virtual core keyboard id=3 [master keyboard (2)] ? Virtual core XTEST keyboard id=5 [slave keyboard (3)] ? Power Button id=6 [slave keyboard (3)] ? Power Button id=7 [slave keyboard (3)] ? Lite-On Technology Corp. Wireless Device id=8 [slave keyboard (3)] ? USB 2.0 camera id=11 [slave keyboard (3)] ? AT Translated Set 2 keyboard id=12 [slave keyboard (3)] My xorg.conf contains: nvidia-xconfig: X configuration file generated by nvidia-xconfig nvidia-xconfig: version 304.48 (buildmeister@swio-display x86-rhel47-04.nvidia.com) Sun Sep 9 21:31:39 PDT 2012 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" InputDevice "TouchScreen" EndSection Section "Files" EndSection Section "InputDevice" Identifier "TouchScreen" Driver "microtouch" Option "Type" "finger" Option "Device" "/dev/ttyS3" Option "ScreenNo" "0" Option "MinX" "0" Option "MaxX" "16383" Option "MinY" "0" Option "MaxY" "16383" Option "SendCoreEvents" "yes" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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• Repacked proprietary software keeps updating the same deb

  - by Johannes

  I repacked a proprietary program delivered as tar file to a deb file for having a company wide repository. I used reprepro to set up a repository and signed it. A unix timestamp is faking a versioning numbering, so I can have different (real) versions installed at the same time. Almost everything works as expected. The deb file looks like this: mysoft8.0v6_1366455181_amd64.deb Only problem on a client machine it tries to install the same deb file over and over again because it thinks its an update. What do I miss: control file in deb package looks like this: Package: mysoft8.0v6 Version: 1366455181 Section: base Priority: optional Architecture: amd64 Installed-Size: 1272572 Depends: Maintainer: me Description: mysoft 8.0v6 dpkg repackaging and the config in the repository: /mirror/mycompany.inc/conf/distributions: Origin: apt.mycompany.inc Label: apt repository Codename: precise Architectures: amd64 i386 Components: main Description: Mycompany debian/ubuntu package repo SignWith: yes Pull: precise Help much appreciated Added guide: This Is the guide I used to create the repository.

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• XY Diagram/Data Browser for mid-sized CSV files

  - by Johannes Rudolph

  I have a set of CSV files with about a 100k records in them. The records need to be visualized in an x-y diagram. Because of the huge amount of data, Excel is not gonna cut it. Specifically, I'm looking for: Seamless zooming in and out of the data Navigation on both axis A "trace mode" where I can trace the line with the cursor and the value under the cursor is displayed as text. Does anyone know a tool capable of this?

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• Problem with deploying simple Spring MVC Portlet to Liferay 5.2.3

  - by Johannes Hipp

  Hello, I try to deploy a simple spring portlet in ext (I can't use Plugins SDK...) on Liferay 5.2.3 My portlet: ext-impl/src: package: com.ext.portlet.springmvc HelloWorldController.java [code] package com.ext.portlet.springmvc; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.Controller; public class HelloWorldController implements Controller { public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String aMessage = "Hello World MVC!"; ModelAndView modelAndView = new ModelAndView("hello_world"); modelAndView.addObject("message", aMessage); return modelAndView; } } [/code] ext-lib: - jstr.jar - spring-webmvc.jar - spring-webmvc-portlet.jar - spring.jar - standard.jar ext-web/docroot/html/portlet/ext/springmvc/hello_world.jsp [code] <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <body> <p>This is my message: ${message}</p> </body> </html> [/code] ext-web/docroot/html/portlet/ext/springmvc/index.jsp [code] <html> <body> <p>Hi</p> </body> </html> [/code] ext-web/docroot/WEB-INF/springmvc-servlet.xml [code] <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean name="/hello_world.html" class="com.ext.portlet.springmvc.HelloWorldController"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans> [/code] ext-web/docroot/WEB-INF/portlet-ext.xml [code] <portlet> <portlet-name>springmvc</portlet-name> <portlet-class>org.springframework.web.portlet.DispatcherPortlet</portlet-class> <supports> <mime-type>text/html</mime-type> <portlet-mode>view</portlet-mode> </supports> <portlet-info> <title>Simple JSP Portlet</title> </portlet-info> <security-role-ref> <role-name>power-user</role-name> </security-role-ref> <security-role-ref> <role-name>user</role-name> </security-role-ref> </portlet> [/code] ext-web/docroot/WEB-INF/web.xml [code] <?xml version="1.0"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.html</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file> jsp/index.jsp </welcome-file> </welcome-file-list> </web-app> [/code] Are there some mistakes? I get this error, when I try to deploy: [code] Website OC4J 10g (10.1.3) Default Web Site definiert ist. Error creating bean w ith name 'com.liferay.portal.kernel.captcha.CaptchaUtil' defined in class path r esource [META-INF/util-spring.xml]: Cannot create inner bean 'com.liferay.portal .captcha.CaptchaImpl#1424b7b' of type [com.liferay.portal.captcha.CaptchaImpl] w hile setting bean property 'captcha'; nested exception is org.springframework.be ans.factory.BeanCreationException: Error creating bean with name 'com.liferay.po rtal.captcha.CaptchaImpl#1424b7b' defined in class path resource [META-INF/util- spring.xml]: Instantiation of bean failed; nested exception is org.springframewo rk.beans.BeanInstantiationException: Could not instantiate bean class [com.lifer ay.portal.captcha.CaptchaImpl]: Constructor threw exception; nested exception is java.lang.NullPointerException [/code] Hope anybody can help me... Thank you very much. Best regards, Johannes

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• luntbuild + maven + findbugs = OutOfMemoryException

  - by Johannes

  Hi, I've been trying to get Luntbuild to generate and publish a project site for our project including a Findbugs report. All other reports (Cobertura, Surefire, JavaDoc, Dashboard) work fine, but Findbugs bails out with an OutOfMemoryException. Excluding findbugs from report generation fixes the build --- although obviously without a Findbugs report. The funny thing is that I first encountered this problem locally and solved it by setting MAVEN_OPTS=-Xmx512m. This does not seem to be enough in Luntbuild, however: setting that exact same option as an environment variable of my builder doesn't make a difference. I've found a couple of posts on the 'net stating you should also add -XX:MaxPermSize=512m to MAVEN_OPTS and/or pass -Dmaven.findbugs.jvmargs=-Xmx512m to mvn.bat. None of these (or their combination) seem to help though so any hints would be greatly appreciated! Cheers, Johannes Relevant information: Luntbuild is 1.5.6, Maven is 2.1.0, findbugs-maven-plugin is 2.0.1. This is the Findbugs section of the relevant pom.xml: <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>findbugs-maven-plugin</artifactId> <version>2.0.1</version> </plugin> This is the head of my build log: User "luntbuild" started the build Perform checkout operation for VCS setting: Vcs name: Subversion Repository url base: http://some.repository.com/repo/ Repository layout: multiple Directory for trunk: trunk Directory for branches: branches Directory for tags: tags Username: xxxx Password:xxxx Web interface: ViewVC URL to web interface: http://some.repository.com/repo/ Quiet period: modules: Source path: somepath, Branch: , Label: , Destination path: somewhere Source path: somepath, Branch: somewhere1.0.x, Label: , Destination path: somewhere-1.0.x Source path: somepath, Branch: somewhere1.1.x, Label: , Destination path: somewhere-1.1.x Update url: http://some.repository.com/repo//trunk Duration of the checkout operation: 0 minutes Perform build with builder setting: Builder name: default Builder type: Maven2 builder Command to run Maven2: "C:\maven\apache-maven-2.1.0\bin\mvn.bat" -e -f somewhere\pom.xml -P site -Dmaven.test.skip=false -DbuildDate="Tue Nov 24 11:13:24 CET 2009" -DbuildVersion="site-core138" -Dsvn.username=xxxx -Dsvn.password=xxxx -DstagingSiteURL=file:///C:/luntbuild/core-reports -Dmaven.findbugs.jvmargs=-Xmx512m Directory to run Maven2 in: Goals to build: site:stage site:stage-deploy Build properties: buildVersion="site-core138" artifactsDir="C:\\Program Files\\Luntbuild\\publish\\somewhere\\site-core\\site-core138\\artifacts" buildDate="Tue Nov 24 11:13:24 CET 2009" junitHtmlReportDir="" Environment variables: MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=512m" Build success condition: result==0 and builderLogContainsLine("INFO","BUILD SUCCESSFUL") Execute command: Executing 'C:\maven\apache-maven-2.1.0\bin\mvn.bat' with arguments: '-e' '-f' 'somewhere\pom.xml' '-P' 'site' '-Dmaven.test.skip=false' '-DbuildDate=Tue Nov 24 11:13:24 CET 2009' '-DbuildVersion=site-core138' '-Dsvn.username=xxxxxx' '-Dsvn.password=xxxxxx' '-DstagingSiteURL=file:///C:/luntbuild/reports' '-Dmaven.findbugs.jvmargs=-Xmx512m' '-DbuildVersion=site-core138' '-DartifactsDir=C:\\Program Files\\Luntbuild\\publish\\somewhere\\site-core\\site-core138\\artifacts' '-DbuildDate=Tue Nov 24 11:13:24 CET 2009' '-X' 'site:stage' 'site:stage-deploy' Tail of my build log: Analyzed: C:\luntbuild\somewhere-work\somewhere\...\SomeClass.class ... Analyzed: C:\luntbuild\somewhere-work\somewhere\...\target\classes Aux: C:\luntbuild\somewhere-work\somewhere\...\target\classes Aux: c:\maven\local-repo\...\somejar-1.1.1.1-SNAPSHOT.jar Aux: c:\maven\local-repo\commons-lang\commons-lang\2.3\commons-lang-2.3.jar .... Aux: c:\maven\local-repo\org\openoffice\ridl\3.1.0\ridl-3.1.0.jar Aux: c:\maven\local-repo\org\openoffice\unoil\3.1.0\unoil-3.1.0.jar [INFO] ------------------------------------------------------------------------ [ERROR] FATAL ERROR [INFO] ------------------------------------------------------------------------ [INFO] Java heap space [INFO] ------------------------------------------------------------------------ [DEBUG] Trace java.lang.OutOfMemoryError: Java heap space at java.util.HashMap.(HashMap.java:209) at edu.umd.cs.findbugs.ba.type.TypeAnalysis$CachedExceptionSet.(TypeAnalysis.java:114) at edu.umd.cs.findbugs.ba.type.TypeAnalysis.getCachedExceptionSet(TypeAnalysis.java:688) at edu.umd.cs.findbugs.ba.type.TypeAnalysis.computeThrownExceptionTypes(TypeAnalysis.java:439) at edu.umd.cs.findbugs.ba.type.TypeAnalysis.transfer(TypeAnalysis.java:411) at edu.umd.cs.findbugs.ba.type.TypeAnalysis.transfer(TypeAnalysis.java:89) at edu.umd.cs.findbugs.ba.Dataflow.execute(Dataflow.java:356) at edu.umd.cs.findbugs.classfile.engine.bcel.TypeDataflowFactory.analyze(TypeDataflowFactory.java:82) at edu.umd.cs.findbugs.classfile.engine.bcel.TypeDataflowFactory.analyze(TypeDataflowFactory.java:44) at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.analyzeMethod(AnalysisCache.java:331) at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getMethodAnalysis(AnalysisCache.java:281) at edu.umd.cs.findbugs.classfile.engine.bcel.CFGFactory.analyze(CFGFactory.java:173) at edu.umd.cs.findbugs.classfile.engine.bcel.CFGFactory.analyze(CFGFactory.java:64) at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.analyzeMethod(AnalysisCache.java:331) at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getMethodAnalysis(AnalysisCache.java:281) at edu.umd.cs.findbugs.ba.ClassContext.getMethodAnalysis(ClassContext.java:937) at edu.umd.cs.findbugs.ba.ClassContext.getMethodAnalysisNoDataflowAnalysisException(ClassContext.java:921) at edu.umd.cs.findbugs.ba.ClassContext.getCFG(ClassContext.java:326) at edu.umd.cs.findbugs.detect.BuildUnconditionalParamDerefDatabase.analyzeMethod(BuildUnconditionalParamDerefDatabase.java:103) at edu.umd.cs.findbugs.detect.BuildUnconditionalParamDerefDatabase.considerMethod(BuildUnconditionalParamDerefDatabase.java:93) at edu.umd.cs.findbugs.detect.BuildUnconditionalParamDerefDatabase.visitClassContext(BuildUnconditionalParamDerefDatabase.java:79) at edu.umd.cs.findbugs.DetectorToDetector2Adapter.visitClass(DetectorToDetector2Adapter.java:68) at edu.umd.cs.findbugs.FindBugs2.analyzeApplication(FindBugs2.java:971) at edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:222) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756) [INFO] ------------------------------------------------------------------------ [INFO] Total time: 17 minutes 16 seconds [INFO] Finished at: Tue Nov 24 11:31:23 CET 2009 [INFO] Final Memory: 70M/127M [INFO] ------------------------------------------------------------------------ Maven2 builder failed: build success condition not met! Note that apparently maven only uses 70MB... but that probably doesn't mean anything since the Findbugs plugin forks its own process.

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• ORM Persistence by Reachability violates Aggregate Root Boundaries?

  - by Johannes Rudolph

  Most common ORMs implement persistence by reachability, either as the default object graph change tracking mechanism or an optional. Persistence by reachability means the ORM will check the aggregate roots object graph and determines wether any objects are (also indirectly) reachable that are not stored inside it's identity map (Linq2Sql) or don't have their identity column set (NHibernate). In NHibernate this corresponds to cascade="save-update", for Linq2Sql it is the only supported mechanism. They do both, however only implement it for the "add" side of things, objects removed from the aggregate roots graph must be marked for deletion explicitly. In a DDD context one would use a Repository per Aggregate Root. Objects inside an Aggregate Root may only hold references to other Aggregate Roots. Due to persistence by reachability it is possible this other root will be inserted in the database event though it's corresponding repository wasn't invoked at all! Consider the following two Aggregate Roots: Contract and Order. Request is part of the Contract Aggregate. The object graph looks like Contract->Request->Order. Each time a Contractor makes a request, a corresponding order is created. As this involves two different Aggregate Roots, this operation is encapsulated by a Service. //Unit Of Work begins Request r = ...; Contract c = ContractRepository.FindSingleByKey(1); Order o = OrderForRequest(r); // creates a new order aggregate r.Order = o; // associates the aggregates c.Request.Add(r); ContractRepository.SaveOrUpdate(c); // OrderAggregate is reachable and will be inserted Since this Operation happens in a Service, I could still invoke the OrderRepository manually, however I wouldn't be forced to!. Persistence by reachability is a very useful feature inside Aggregate Roots, however I see no way to enforce my Aggregate Boundaries.

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• Using Unicode in fancyvrb’s VerbatimOut

  - by Konrad Rudolph

  Problem VerbatimOut from the “fancyvrb” package doesn’t play nicely with UTF-8 characters. Minimal working example: \documentclass{minimal} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{fancyvrb} \begin{document} \begin{VerbatimOut}{\jobname.test} é \end{VerbatimOut} \input{\jobname.test} \end{document} Error message When compiled using pdflatex mini, this gives the error File ended while scanning use of \UTFviii@three@octets. A different error occurs when the sole occurrence of é above is replaced by something else, e.g. é */: Package inputenc Error: Unicode char \u8:### not set up for use with LaTeX. – indicating that in this case, LaTeX succeeds in reading a multi-byte UTF-8 character, but not knowing what to do with it (i.e. it’s the wrong character). In fact, when I open the produced .test file manually, it contains the character é, but in Latin-1 encoding! Proof: when I open the files in a hex editor, I get the following: Original file: C3 A9 (corresponds to LATIN SMALL LETTER E WITH ACUTE in UTF-8) Written file: E9 (corresponds to é in Latin-1) Question How to set VerbatimOut up correctly? filecontents* (from “filecontents”) shows that it can work. Unfortunately, I don’t understand either code so I cannot fix fancyvrb’s code by replicating the logic from filecontents manually. I also cannot use filecontents* instead of VerbatimOut because the former doesn’t work within a \newenvironment, while the latter does. (Oh, by the way: vanilla Verbatim instead of VerbatimOut also works as expected. The error seems to occur when writing the file, not when reading the verbatim input)

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