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• Unity Launcher only runs once - requires lightdm restart before it runs again

  - by Don

  I have an intermittent problem that just started showing up several days ago. I am running 11.10 and all updates are current. I first saw the symptom with a custom version of the "Home" nautilus-home.desktop file I created in ~/.local.share/applications. I added a few static shortcuts to specific folders. What I found was, clikcing the icon once would open up my home folder, but after closing that nautilus window, clicking the icon again did nothing (did not even show icon backlight animation). However, I could right click on the same icon and access my short cuts as many times as I want. Symptom persisted until restarting lightdm. Just yesterday I saw the same sort of symptom happen with a custom launcher I created for a chromium-borwser to open a specific URL (with a few short cuts to other URLs). Click the icon - it works once. Then never again. Right click the icon and I can use the short cuts over and over - no problem. Note - at one point I assumed I might have a problem with my custom .desktop file, so I did a test by removing my custom nautilus-home.desktop. However, even after restarting lightdm, and verifying the home icon was the standard one from /opt/share/applications (all my custom shortcuts were gone) I saw the same symptom re-appear - it runs once and then not again until restarting lightdm. It seems to be intermittent and seems to move between various launchers. Not sure what to do or even what background data to gather. Attempt to improve question after the first answer: I tried the following: 1) remove all custom launchers 2) reboot 3) add custom lauchers back 4) reboot 5) attempt to use .... still have "runs once and never again" symptom with several launchers

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• Webserver not giving the correct response on CURL and other httprequest methods [migrated]

  - by Maxim

  I am trying to make a REST request to a external webserver by using this code <?php $user = 'USER'; $pass = 'PASS'; $data = "MYDATA" $ch = curl_init('URL'); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Content-Type: application/json', 'Content-Length: ' . strlen($data)) ); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_VERBOSE, true); if(!($res = curl_exec($ch))) { echo('[cURL Failure] ' . curl_error($ch)); } curl_close($ch); echo($res); Now this is a CURL request, however i tried different methods to test my result and they all give me a 403 forbidden error response that i get from the webserver, however i do get a 200 response when i run it on any other webserver (localhost, webserver2, ...) Therefore i think there is something wrong with my webserver and it might be disallowing/caching the post parameters that i provide because sometimes it returns a 200 response but most of the times it returns the 403. This is the response i get : HTTP/1.1 403 Forbidden Accept-Ranges: bytes Content-Type: application/json; charset=UTF-8 Date: Sat, 26 Oct 2013 13:56:37 GMT Server: Restlet-Framework/2.1.3 Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept Content-Length: 77 Connection: keep-alive {"error":"ForbiddenOperationException","errorMessage":"Invalid credentials."} It says Invalid credentials however i provide the correct credentials and i can confirm them because it is working on other servers. Since this is a crucial part of my script that i use for clients to register i assume that there is something wrong with the post parameters. I am running cpanel and uninstalled the following already: - varnish - apachebooster i also recompiled php already and enabled curl and its dependencies but nothing seems to resolve my problem. If more information is required then don't hesitate to ask me in the comments i will respond very quickly as i really need this. any help is appreciated. Kind regards Maxim

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• What can you do to decrease the number of live issues with applications?

  - by User Smith

  First off I have seen this post which is slightly similar to my question. : What can you do to decrease the number of deployment bugs of a live website? Let me layout the situation for you. The team of programmers that I belong to have metrics associated with our code. Over the last several months our errors in our live system have increased by a large amount. We require that our updates to applications be tested by at least one other programmer prior to going live. I personally am completely against this as I think that applications should be tested by end users as end users are much better testers than programmers, I am not against programmers testing, obviously programmers need to test code, but they are most of the times too close to the code. The reason I specify that I think end users should test in our scenario is due to the fact that we don't have business analysts, we just have programmers. I come from a background where BAs took care of all the testing once programmers checked off it was ready to go live. We do have a staging environment in place that is a clone of the live environment that we use to ensure that we don't have issues between development and live environments this does catch some bugs. We don't do end user testing really at all, I should say we don't really have anyone testing our code except programmers, which I think gets us into this mess (Ideally, we would have BAs or QA or professional testers test). We don't have a QA team or anything of that nature. We don't have test cases for our projects that are fully laid out. Ok, I am just a peon programmer at the bottom of the rung, but I am probably more tired of these issues than the managers complaining about them. So, I don't have the ability to tell them you are doing it all wrong.....I have tried gentle pushes in the correct direction. Any advice or suggestions on how to alleviate this issue is greatly appreciated. Thanks.

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• Converting raw data type to enumerated type

  - by Jim Lahman

  There are times when an enumerated type is preferred over using the raw data type.  An example of using a scheme is when we need to check the health of x-ray gauges in use on a production line.  Rather than using a scheme like 0, 1 and 2, we can use an enumerated type: 1: /// <summary> 2: /// POR Healthy status indicator 3: /// </summary> 4: /// <remarks>The healthy status is for each POR x-ray gauge; each has its own status.</remarks> 5: [Flags] 6: public enum POR_HEALTH : short 7: { 8: /// <summary> 9: /// POR1 healthy status indicator 10: /// </summary> 11: POR1 = 0, 12: /// <summary> 13: /// POR2 healthy status indicator 14: /// </summary> 15: POR2 = 1, 16: /// <summary> 17: /// Both POR1 and POR2 healthy status indicator 18: /// </summary> 19: BOTH = 2 20: } By using the [Flags] attribute, we are treating the enumerated type as a bit mask.  We can then use bitwise operations such as AND, OR, NOT etc. . Now, when we want to check the health of a specific gauge, we would rather use the name of the gauge than the numeric identity; it makes for better reading and programming practice. To translate the numeric identity to the enumerated value, we use the Parse method of Enum class: POR_HEALTH GaugeHealth = (POR_HEALTH) Enum.Parse(typeof(POR_HEALTH), XrayMsg.Gauge_ID.ToString()); The Parse method creates an instance of the enumerated type.  Now, we can use the name of the gauge rather than the numeric identity: 1: if (GaugeHealth == POR_HEALTH.POR1 || GaugeHealth == POR_HEALTH.BOTH) 2: { 3: XrayHealthyTag.Name = Properties.Settings.Default.POR1XRayHealthyTag; 4: } 5: else if (GaugeHealth == POR_HEALTH.POR2) 6: { 7: XrayHealthyTag.Name = Properties.Settings.Default.POR2XRayHealthyTag; 8: }

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• How much effort should you put into a junior developer?

  - by Crazy Eddie

  At what point should one give up? I've tried helping them out by having them shadow me. We agree to break a minute, and then they go missing in action for a while...then just go back to their desk. Even when I know they've done this, part of me feels like I shouldn't have to go get them but that they should be showing interest in learning. Frankly, it's a bunch of time I don't have explaining things as I go when I could just do it. Am I expecting too much to expect that if they want to learn they'll make sure I know they're ready and willing? They go to meetings that they where not told they had to, good, but then sit in the corner and sleep...bad. I don't even know what to do with that. Sometimes I give them something small to do and they do it great, so I give them something just a touch harder and they totally fail, hard. Check in things without testing them. Part of me thinks that maybe I should be spending more time with them but at the same time I don't see a lot of interest and I really, honestly don't have time teaching the same things over and over. Sometimes I get asked questions that are really, really easy to answer if you just do a little bit of your own work trying to find out. Other times I'm not asked anything. I'm sure I could be doing better but honestly...I don't really want to anymore.

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• Karmetasploit (aircrack-ng) Not consistantly Broadcasting AP ssid

  - by Sparky

  I cannot seem to get karmetasploit to broadcast my AP. Actually, taking it back a few steps I cannot get airbase-ng (v.r2154) to broadcast an SSID. I have seen it broadcast a few intermittent times (not many at all), but most of the time it doesn't show up at all. When it showed up the last time it came up as ad-hoc also. simplest comand I have tried: sudo airbase-ng -e "Wifi-test" -c 11 -v mon0 (I have tried with/without -c and -P -C 30) It appears to work just fine on the attacking machine, but nothing gets broadcasted. I have tried viewing from (3) different computers (winXP, Win7, ubuntu 12.04) Additionally, I am running Ubuntu 12.04 I have tried (3) different wireless cards Internal Card: Intel 4965 External USB: Ubiquiti Atheros carl9170 external SUB: ALFA AWUS036H Realtek RTL8187L I have tried putting each in/out of monitor mode (airmon-ng start monX) I have also tested to see if injection is working: sudo aireplay-ng -9 mon0 sudo aireplay-ng -9 mon0 22:37:54 Trying broadcast probe requests... 22:37:55 Injection is working! 22:37:56 Found 4 APs ... ... Has anyone experienced this issue and have advice/solution? I the aircrack-ng forum site has been down for some time, so I cannot get advice from that site. Thanks, Sparky

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• How can I give a basic idea of what I'm working on to a non programmer?

  - by Jesse

  As a relatively new programmer (1 year professionally, many years as an amateur) I've run into many situations that sent me running to Stack Overflow for answers that failed my meagre experiences. Tonight I received the hardest question ever. My wife asked me: What are you working on? The questions is deceptive in it's simplicity. A straight forward and truthful answer of "I'm working on a c# class module for monitoring database delivery times" is sure incite suggestion of attempts to confuse. My second instinct was to suggest that it couldn't really be explained to a layperson, after very brief consideration I came to the conclusion that this would likely result in a long and sleepless night on the sofa. The end result was a muddled answer along the lines of "something to monitor automatic things to make sure they're delivered on time". The reception was fairly chilly, I had to make many assurances that I was not insulting her ample intelligence. My question is thus, what is the best way to discuss your work as a programmer with your significant other who is not.

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• Self Service Reporting With PowerPivot

  - by blakmk

  There are so many cool new features in Sql 2008 release 2 it was difficult for me to pick a topic for T-SQL Tuesday . But the one that I am now a secret fan of, I once resented for its creation. Let me explain, for years I have encountered reporting systems cobbled together in tools like Access and Excel built by "database hobbyists" who had no formal training in database design or best practices. They would take their monstrosities as far as they could go before ultimatley it stopped working or the person that wrote it left the company. At that point it would become the resident DBA's problem to support it as a Live application. So when I first heard of Power Pivot, a sense of Deja Vu overtook me and I felt like the guy in the Ausin Powers movie , knowing the inevitable is coming but somehow unsure how to get out of the way. But when I eventually saw it in action, I quickly realised that it is a very powerful tool. It has a much smaller "time to market" than traditional BI architectures. Combined with the new features of Excel, some pretty impressive dashboards can be produced.Of course PowerPivot is not a magic bullet and along with potential scalability issues there are the usual issues such as master data management and data quality that cannot be overcome easily with power pivot. As a tool though, it has potential. Traditional BI is expensive, both in terms of time and the amount of resources it takes to deliver the system. The time lag between an analyst or a commercial accountant requesting reports and the report being delivered can make a huge commercial difference. I have observed companies where empowered end users become extremely productive when allowed to plough in to various disperate datasets. It may not be the correct way or the most sustainable but its cheap and quick. In these times when budgets are being slashed and we are forced to deliver more with less, why not empower the end user in a tool that is designed for exactly this task.... @blakmk  

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• How often does Dreamhost change IP Addresses

  - by pjreddie

  So I just migrated our site to dreamhost because they are free for non-profits. However, right after I switched the nameservers over to them they changed the IP address of the site. So first they propagated out IP address x.x.x.180, then they switched it to x.x.x.178 and had to propagate that out. Point being it meant a lot of downtime since a lot of big DNS servers (like google) thought the address was still x.x.x.180 for up to 5 hours after they switched it. This is compounded by the fact that most our visitors to the site live here in Unalaska and we have local DNS servers that take a LONG time to update (like a day or more) since we get all our internet over satellite. So every time Dreamhost changes our IP address it can mean a day of downtime for us in our community. So my question is, how often do these changes take place? I asked Dreamhost support and they gave me a vague response: I wish I could say, however those changes happen at random times. They're not that frequent, maybe even months between updates, but there's no way to know for sure. First, I hardly believe that they don't know their own system well enough to give me at least some estimate or average. Second, is it worth looking at other providers so that I can get a static IP address? We were hosting the site here originally and hadn't run into this problem since we have a static IP here. We don't get a ton of traffic but usually around 500 hits a day or so, sometimes more if our stories are featured on statewide or national news broadcasts. So hours of downtime every time Dreamhost "randomly" decides to move our server location can be bad for our readership.

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• How to show or direct a business analyst to a data modelling subject?

  - by AaronLS

  Our business analysts pushed hard to collect data through a spreadsheet. I am the programmer responsible for importing that data. Usually when they push hard for something like this, I never know how well it will work out until a few weeks later when I have time assigned to work on the task of programming the import of the data. I have tried to do as much as possible along the way, named ranges, data validations, etc. But I usually don't have time to take a detailed look at all the data and compare to the destination in the database to determine how well it matches up. A lot of times there will be maybe a little table of items that somehow I have to relate to something else in the database, but there are not natural or business keys present that would allow me to do so. Make the best of this, trying to write something that can compare strings and make a best guess at it and then go through the effort of creating interfaces for a user to match the imported data to the destination. I feel like if the business analyst was actually creating a data model, they would be forced to think about these relationships, and have an appreciation for the need of natural or business keys to be part of the spreadsheet for the purposes of smoothly importing the data. The closest they come to business analysis is a big flat list of fields, and that would be fine if it were like any other data dictionary and include data types+relationships, but it isn't. They are just a bunch of names. No indication of what type of data they might hold, and it is up to me to guess. When I have pushed for more detail, they say that it is just busy work. How can I explain the importance of data modelling? How can I tell them what it is and how to do it? It feels impossible, because they don't have an appreciation for its importance. They do however, usually have an interest in helping out in whatever way they can, it's just this in particular has never gotten a motivated response.

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• Architectural and Design Challenges with SOA

  With all of the hype about service oriented architecture (SOA) primarily through the use of web services, not much has been said about potential issues of using SOA in the design of an application. I am personally a fan of SOA, but it is not the solution for every application. Proper evaluation should be done on all requirements and use cases prior to deciding to go down the SOA road. It is important to consider how your application/service will handle the following perils as it executes. Example Challenges of SOA Network Connectivity Issues Handling Connectivity Issues Longer Processing/Transaction Times How many of us have had issues visiting our favorite web sites from time to time? The same issue will occur when using service based architecture especially if it is implemented using web services. Forcing applications to access services via a network connection introduces a lot of new failure points to the application. Potential failure points include: DNS issues, network hardware issues, remote server issues, and the lack of physical network connections. When network connectivity issues do occur, how are the service clients are implemented is very important. Should the client wait and poll the service until it is accessible again? If so what is the maximum wait time or number of attempts it should retry. Due to the fact of services being distributed across a network automatically increase the responsiveness of client applications due to the fact that processing time must now also include time to send and receive messages from called services. This could add nanoseconds to minutes per each request based on network load and server usage of the service provider. If speed highly desirable quality attribute then I would consider creating components that are hosted where the client application is located. References: Rader, Dave. (2002). Overcoming Web Services Challenges with Smart Design: http://soa.sys-con.com/node/39458

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• Suddely internet is not accessible

  - by user189708

  I am going crazy here. One day everything was working fine. I turned pc off and went to sleep. Next day turn pc on and cannot access internet (from any browser). The situation is: I cannot open any webpage from browser (tried Firefox and Epiphany) and cannot receive emails in thunderbird. BUT if I run firefox from console as sudo, I can use it as usual. I can access Skype and pretty much any other network stuff (like installing software with apt-get etc.), also if I use Astrill VPN software I can access webpages even running without sudo. I haven't install any software or anything like that for several days = I have not a clue what could cause this. Just by the way, other Win PC in our home has no issue. Here is what I have tried to fix this: I have tried to restart my pc, router, modem - multiple times I have tried to change permissions to my firefox profile I have tried to completely re-install firefox and start with blank profile, thus no addons I have tried to change /etc/resolv.conf to an IP of my router (it was 127.0.1.1) I have tried to change my hostname (from tomino-NB to tominoNB) I think I might try even more stuff. None of it works. Can someone please try to help me. Thank you UPDATE 1: I have tried this: Removing resolv.conf - Didn't help Also "ping" and "dig" commands cannot resolve host UPDATE 2: I have tried to edit nameservers in resolv.conf but still no effect. I can ping router as well as I can ping outside IP. So definitely just some DNS issue. Is it possible that something is rewriting path to resolv.conf and using different file? UPDATE 3: I have just restarted PC and everything works now... resolv.conf went back to nameserver 127.0.1.1 . I have no clue what happened that it works again...

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• How does one network at software conferences?

  - by Billy ONeal

  Well... I'm still at Microsoft TechEd -- and the response to my last question was overwhelmingly "networking is the most useful part of software conferences". Problem: I have no idea how to even approach that task. I've always been kind of an introvert. At school and at work I've generally not had issues because there are enough extroverts around that approach me that I've made some awesome friends over the years. However, at conferences, it seems most are introverted like myself, and those who aren't seem to be salespeople. The couple of times I've felt okay approaching people it's been after a session where there's been healthy discussion throughout the whole room, and just when I get the nerve to go up and talk to some people, they leave and go on to other things. Are there books I can read? Advice I can take? Anything as far as approaching people one does not know? 'Cause every time I try I just feel like an awkward mess. :( (Oddly enough, I don't have problems speaking to a group of people -- it's the one-on-one things that trip me up :P) (Oh, and by the way, if anyone from here is also there and would like to meet to talk about things, I'm game :P)

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• My card reader doesn't show up at all, but previously did in 10.10

  - by Nathan J. Brauer

  I bought a pin-based-USB powered internal media card reader and it worked perfectly when I first installed Ubuntu 10.10 a month ago. I used it a few times since and today I booted up the computer and it's not working. Here's how it used to work: In nautilus->computer, 5 "drives" would display even when no card was inserted. One for each slot (SD, XD, CF/MS, etc). Opening one w/o a card would initiate a "Please insert card." dialog. Inserting a card would automatically open nautilus. Now: No drives display at all whether cards are inserted or not. lsusb lists the following (which seems to indicate that it's not being detected) Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 002: ID 046d:c52e Logitech, Inc. (my keyboard/mouse) Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub (A side note, all of my USB ports are 2.0 + 1 USB port which is 3.0, why does everything say 1.1/2.0?) I tried using ubuntu-bug but for USB devices it expects you to be able to remove and insert them while the computer is running -- obviously something you probably shouldn't be doing when you're dealing with devices plugged straight into the USB pins. Thanks in advance!

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• Keyboard freezes / stuck if a key pressed repeatedly

  - by Aziz Rahmad

  I use Acer 4530. This problem has happened long since Ubuntu 10.10 and now that I use 11.04 dual booted with Linux Mint 10. Everytime I press one key repeatedly, like when I read a long article in a website/ebook or when I play games which required me to press arrow keys repeatedly, it would randomly freeze. That is, whatever I press on keyboard has no effect, and that also happens with touchpad. However, the USB mouse works just fine. I later found out that it's not actually freeze but more like it's like the key stuck. For example when I play tetris which I usually press w (down) button repeatedly, after some times it would freeze. And if I put the cursor in, say, browser's address bar, it would type "wwww....." infinitely. The only way I could fix it is by suspend the laptop, either by using mouse or by closing the lid. And instead of suspended, in that case the laptop would automatically wake up and everything will be fine. (Usually my laptop would wake up after suspended by pressing any key) It has happened since the first time I use Ubuntu, 10.10, and it also happens in Linux Mint 10, and until now in Ubuntu 11.04. It never happened when I use Windows, though. Anyone has ever encounter similar problem? Anyone know how to fix it permanently? UPDATE I just recently installed Windows 7 and Windows 8 Development Preview and both have similar symptoms. So I declare that this problem is not OS specific, probably hardware problem.

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• Java Road Trip: Code to Coast (#javaroadtrip)

  - by Justin Kestelyn

  Hey, have you heard? The Java Road Trip bus may be stopping at a city near you this summer, starting June 14. And your peeps at Oracle Technology Network have donated some goodies. What is the Java Road Trip? Basically, we have packed a rock-star bus with demos (Java FX, Oracle ADF, Java EE 6, JDK 7, GlassFish, Java ME) and are putting it on the road; it will make 20 stops across the U.S. in the next couple of months (and MAY may make a special appearance at JavaOne, if we can find a big enough parking space). In many cases these stops will coincide with Java or Oracle user group meet-ups and will always involve beer, food, and free stuff. Furthermore, engineers from HQ will be flying out at various times to rendezvous with these meet-ups and answer your questions. Also, because this tour will only reach a relatively small number of people, we're working hard to provide a virtual experience: there will be a blogger/videographer/photog/tweeter on board, reporting on its every move. You'll find all this content at java.com/roadtrip, and you can get real-time updates via @java. And this new update: If you're attending ODTUG Kaleidoscope in Washington, D.C., in late June, you'll get a chance to see the Java Bus in all its glory. And don't forget your t-shirt, cup, and screen cleaner, all provided by Oracle Technology Network.

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• Why does Ubuntu keep trying to connect to a WiFi network while plugged into an ethernet

  - by labarna

  My desk is situated at the edge of the range of a wireless signal which I use occasionally (when away from my desk) and is therefore saved in network manager. At my desk, however, I plug into the ethernet cable. While I'm working the computer is constantly trying to join the wireless network and usually failing this results in two annoying behaviors. 1: In gnome shell the network connect and disconnect notices keep popping up at the bottom of the screen and I have to click them to make them disappear (I assume it's been fixed in the next version of gnome). 2: (the worst!) Occasionally the wifi password dialog will pop up and ask for the password to this network (which is already saved). An additionally annoyance is that in gnome shell I'll get two copies of the dialog that I have to cancel, one is gnome shell themed (no window border etc...) and the other is just normal gnome themed. (Sometimes if I've been away from the computer for a while I will have multiple copies of this dialog up as its been trying to connect for a while resulting in at times 20 dialogs to cancel). Note, all the while I've been happily connected to the ethernet and have full network access. This is incredibly annoying and distracting, why doesn't ubuntu stop trying to connect to wifi if I'm on the ethernet (unless I want to broadcast my own network, but that's different)?

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• Game Resource Generation

  - by Darthg8r

  I am currently building a game that has a "City" entity. These cities generate and consume resources such as food variably over a period of time. I need to be able query the server often to find exactly how much food the city at any given point. These queries can take place multiple times per minute. There could also be 400,000 cities to track at a given time. How would you handle tracking these resources? Would you do it in real time, keeping an instance of the city in memory on the server, with some sort of a snapshot in time of the resources, then computing the growth/consumption from that snapshot time for subsequent queries? Would you work exclusively with a database, using a similar "snapshoting" scheme? Maybe a mixture of the 2, caching recently queried cities in memory for a period of time? There is also a lot of other data that each city needs to track. A player can queue units to build in a barrack. The armies available in the city will need to be updated as units complete. I'm interested in everyone's input on where/when/how you'd manage the real time data.

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• FULL LIST Difference Edubuntu over Ubuntu

  - by Richard Kemp

  I have always used Edubuntu rather than Ubuntu because I have many children including home educated ones who casually use the education offerings. I appreciate many but not all of the extra offerings. I never got beyond 8.04.4 LTS, so am considering updating. I note now with Edubuntu 12.04 it is 2GB i.e.4 times bigger, even apparently using squashfs. I do now have to consider whether the extra resources are worth it in each computer in my household. I am sick of reading over and over again 'Edubuntu is Unbuntu with extras such as blah blah', and in a different place the same thing but with a different blah blah. I downloaded Edubuntu 12.04 and ran it 'live'. Can't say I got on at all with the Unity Interface (this can be changed when installed), but the apparent education stuff seemed quite small and pathetic, I am obviously not finding it. Is there anywhere a FULL LIST of what Edubuntu has pre-installed has over Ubuntu, so a sensible decision can be made whether to go for it, or just add packages that look relevant to me to Ubuntu. Is there truly no other difference between Unbuntu/Edubuntu but the extra educational packages? (I for example have no school server, but if I understood exactly what is involved, with the number of computers in the house, it may be worth creating one!) Please advise. Thank You.

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• XNA Skinned Animated Mesh Rendering Exported from Maya

  - by Devin Garner

  I am working on translating an old RTS game engine I wrote from DirectX9 to XNA. My old models didn't have animation & are an old format, so I'm trying with an FBX file. I temporarily "borrowed" a model from League of Legends just to test if my rendering is working correctly. I imported the mesh/bones/skin/animation into Maya 2012 using an "unnamed" 3rd-party import tool. (obviously I'll have to get legit models later, but I just want to test if my programming is correct). Everything looks correct in maya and it renders the animations flawlessly. I exported everything into a single FBX file (with only a single animation). I then tried to load this model using the example at the following site: http://create.msdn.com/en-US/education/catalog/sample/skinned_model With my exported FBX, the animation looks correct for most of the frames, however at random times it screws up for a split second. Basically, the body/arms/head will look right, but the leg/foot will shoot out to a random point in space for a second & then go back to the normal position. The original FBX from the sample looks correct in my program. It seems odd that my model was imported into maya wrong, since it displays fine in Maya. So, I'm thinking either I'm exporting it wrong, or the sample code is bad & the model from the sample caters to the samples bad code. I'm new to 3D programming & maya, so chances are I'm doing something wrong in the export. I'm using mostly the defaults, but I've tried all 3 interpolation modes (quaternion, euler, resample). Thanks

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• How to explain why design choices are good?

  - by Telastyn

  As I've become a better developer, I find that much of my design skill comes more from intuition than mechanical analysis. This is great. It lets me read code and get a feel for it quicker. It lets me translate designs between languages and abstractions much easier. And it let's me get stuff done faster. The downside is that I find it harder to explain to teammates (and worse, management) why a particular design is advantageous; especially teammates that are behind the times on best practices. "This design is more testable!" or "You should favor composition over inheritance." go right over their heads, and lead into the rabbit hole of me trying to clue everyone in to the last decade of software engineering advances. I'll get better at it with practice of course, but in the mean time it involves a lot of wasted time and/or bad design (that will lead to wasted time fixing it later). How can I better explain why a certain design is superior, when the benefits aren't completely obvious to the audience?

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• Dell Laptop's Bluetooth isn't detected by Ubuntu

  - by vishwaje

  I have Dell vostro 3500 Laptop. I Installed Ubuntu 12.04. It doesn't detect my bluetooth. below is my information. lsusb | grep Bluetooth Bus 001 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth) lsmod | grep bluetooth bluetooth 158438 10 bnep,rfcomm rfkill list 0: brcmwl-0: Wireless LAN Soft blocked: yes Hard blocked: no 1: dell-wifi: Wireless LAN Soft blocked: yes Hard blocked: no (wifi working fine. I disabled it using network menu. So, it's fine) dmesg | grep Bluetooth [ 21.981835] Bluetooth: Core ver 2.16 [ 21.981872] Bluetooth: HCI device and connection manager initialized [ 21.981877] Bluetooth: HCI socket layer initialized [ 21.981881] Bluetooth: L2CAP socket layer initialized [ 21.981891] Bluetooth: SCO socket layer initialized [ 21.986047] Bluetooth: RFCOMM TTY layer initialized [ 21.986059] Bluetooth: RFCOMM socket layer initialized [ 21.986065] Bluetooth: RFCOMM ver 1.11 [ 22.361783] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 22.361791] Bluetooth: BNEP filters: protocol multicast So How can I fix this? I saw other place (I don't remember which site) They said, some times, when in windows, if bluetooth disabled by windows driver, It can't be enabled by linux. So, I should install windows and enable blueethooth from windows and then re install linux. That is impossible for me, because I don't have Windows installation media. But I tried this, which is I installed windows xp on virtual box. Vbox showed me thow unknow USB devices. I connected them and installed windows bluethooth drivers to xp. But it didn't ditected Bluethooth either. Also, when I set off mode in hardware switch, those unknown devices disappear from Vbox usb device seletcion menu. So, they are definitely something to do with wifi or bluethooth. Please help me..

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• Relationship between Repository and Unit of Work

  - by NullOrEmpty

  I am going to implement a repository, and I would like to use the UOW pattern since the consumer of the repository could do several operations, and I want to commit them at once. After read several articles about the matter, I still don't get how to relate this two elements, depending on the article it is being done in a way u other. Sometimes the UOW is something internal to the repository: public class Repository { UnitOfWork _uow; public Repository() { _uow = IoC.Get<UnitOfWork>(); } public void Save(Entity e) { _uow.Track(e); } public void SubmittChanges() { SaveInStorage(_uow.GetChanges()); } } And sometimes it is external: public class Repository { public void Save(Entity e, UnitOfWork uow) { uow.Track(e); } public void SubmittChanges(UnitOfWork uow) { SaveInStorage(uow.GetChanges()); } } Other times, is the UOW whom references the Repository public class UnitOfWork { Repository _repository; public UnitOfWork(Repository repository) { _repository = repository; } public void Save(Entity e) { this.Track(e); } public void SubmittChanges() { _repository.Save(this.GetChanges()); } } How are these two elements related? UOW tracks the elements that needs be changed, and repository contains the logic to persist those changes, but... who call who? Does the last make more sense? Also, who manages the connection? If several operations have to be done in the repository, I think using the same connection and even transaction is more sound, so maybe put the connection object inside the UOW and this one inside the repository makes sense as well. Cheers

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• Understanding Service Compensation part of Industrial SOA series

  - by JuergenKress

  Some of the most important SOA design patterns that we have successfully applied in projects will be described in this article. These include the Compensation pattern and the UI mediator pattern, the Common Data Format pattern and the Data Access pattern. All of these patterns are included in Thomas Erl's book, "SOA Design Patterns", and are presented here in detail, together with our practical experiences. We begin our "best of" SOA pattern collection with the Compensation pattern. Compensation is required in error situations in an SOA, as multiple atomic service operations cannot generally be linked with classic transactions this would violate the principle of loose coupling. An error situation of this sort will occur, particularly if service operations are combined into processes or new services during orchestration or by applying the Composite pattern, and the transaction bracket has to be expanded as a result. We need mechanisms to undo the effects of individual services (the status changes in the overall system) and to ensure that a consistent system state is maintained at all times, so as to preserve system integrity. For the Compensation pattern, we would like to address the following questions: Why is compensation important in relation to SOA? How is the topic of compensation linked with the topic of transactions? What are the challenges with regard to compensation... Read the full article in the Service Technology Magazine or at OTN. Share your comments and feedback on the Industrial SOA series by using the hashtag #industrialsoa. Missed an article of the Industrial SOA series visit the overview at OTN. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: Industrial SOA,SOA,SOA Service Compensation,Community,Oracle SOA,Oracle BPM,OPN,Jürgen Kress

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• More Tables or More Databases?

  - by BuckWoody

  I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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