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• java MainServer gives java.lang.UnsupportedClassVersionError: Unsupported major.minor version 51.0

  - by Paradox

  Compiling is easy but when using java to run the programs, it gives Exception found. I am using Ubuntu 12.04 without internet connections. Also, installed Oracle JDK7 and JRE7. Also did the update-alternatives command on java, javac and javaws. Changed the machine java in /etc/profiles. PATH is pointing to oracle java folder. I did many searches on Google about this topic but each time jdk and jre version are different. Also check version of jdk and jre using java -version and javac - version. Both of them are the same. The system also contains OpenJdk6 and OpenJdk7. So, how do I remove these errors?

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• Is it needed to have your blog title and description in H1 and H2

  - by Saif Bechan

  I have read an article that states that it is not necessary to have your blog title and description on your website at all. Just have the titles of the posts in h1, on the index and the post page. And on the post page have your different sections started with h2. Widget headers start with h3. Title and description are most of the time in the logo image. I have looked at the source of my favorite blog, http://net.tutsplus.com, and I see they do the same. Is this recommended?

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• What are my options for selling software independently on Windows?

  - by technomalogical

  I am looking to port a tool from the Mac app store over to Windows, the platform where I spend most of my time these days. I've spoken with the author of the original app and we've begun talking about licensing options should I decide to sell the application, and it seems like it would be feasible. I've never sold software independently, let alone on Windows. That I know of, there is not (yet) an equivalent app store for Windows (maybe one coming with Windows 8). Assuming my product was done today and I was ready to go to market, what options do I have for selling software for Windows as an independent developer or Micro-ISV? I know can sell it through my own website and accept PayPal, but are there options that will offer more visibility, similar to that of the Apple app stores? Any options to avoid?

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• Just interviewed, turned down, now got an email asking to chat with recruiter. No response. What should I do? [closed]

  - by Lambert

  I was turned down after two interviews by a prominent company for an internship, and only a couple days later, I was asked when I had 10-15 minutes to chat today. Of course, I loved to, so I emailed within just 10 minutes of their email and let them know what times I was available at, and asked them when the best time should be, and if I should go somewhere or expect a phone call. No reply has come from them since yesterday afternoon, the recruiter wanted to talk to me today. I don't want to lose this opportunity, but I have no way to contact the recruiter other than by email, and the recruiter hasn't responded to my emails from yesterday, even though we were supposed to talk today. What's the best thing I can do (preferably within the next few hours!) to get the job? Is that even probably why she emailed me, or was a different reason likely? Any ideas?

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• How do i completely remove phpmyadmin?

  - by blade19899

  I messed up my phpmyadmin, I haven't logged in, in phpmyadmin, in a while, and as a result i forgot my password, so i purged it like so: sudo apt-get purge phpmyadmin. I did get some error messages asking for my password but i forgot that, so i just pressed ignore, after that i installed phpmyadmin again like so: sudo apt-get install phpmyadmin. This time i wont be forgetting my password. But now, when i logging my phpmyadmin I get a 404 not found error page!? Question: How do i completely remove phpmyadmin and as a result get phpmyadmin working again Note: I am running Ubuntu 12.10(AMD64)

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• Oracle 11g RAC 11.1.0.7 on OEL 5.4 templates for Oracle VM released!

  - by wim.coekaerts

  We just released 2 new template packs for Oracle VM on our e-delivery website. The RAC team spent a lot of time building these fine templates for Oracle VM including elaborate documentation for both test and production usage. The documentation is included in the tar/zip files. Have fun ! you can go to http://edelivery.oracle.com/oraclevm Product Pack : Oracle VM templates Platform : x86 32 bit or x86 64 bit Oracle VM Templates for Oracle RAC Media Pack for x86 (32 bit) Oracle VM Templates for Oracle RAC Media Pack for x86_64 (64 bit) Freely downloadable OEL (+OEL/JeOS) and Oracle VM and free download of the trial version of Oracle 11g RAC.

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• Worst practices in C++, common mistakes ...

  - by Felix Dombek

  After reading this famous rant by Linus Torvalds, I wondered what actually are all the bad things programmers might do in C++. I'm explicitly not referring to typography errors or bad program flow as treated in this question and answers, but to more high-level errors which are not detected by the compiler and do not result in obvious bugs at first run, complete design errors, things which are improbable in C but are likely to be done by newcomers who don't understand the full implications of their code. I also welcome answers pointing out a huge performance decrease where it would not usually be expected. An example of what one of my professors once told me: You have used somewhat too many instances of unneeded inheritance and virtuality. Inheritance makes a design much more complicated (and inefficient because of the RTTI (run-time type inference) subsystem), and it should therefore only be used where it makes sense, e.g. for the actions in the parse table." [I wrote an LR(1) parser generator.] "Because you make intensive use of templates, you practically don't need inheritance."

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• Thread.Interrupt Is Evil

  - by Alois Kraus

  Recently I have found an interesting issue with Thread.Interrupt during application shutdown. Some application was crashing once a week and we had not really a clue what was the issue. Since it happened not very often it was left as is until we have got some memory dumps during the crash. A memory dump usually means WindDbg which I really like to use (I know I am one of the very few fans of it).  After a quick analysis I did find that the main thread already had exited and the thread with the crash was stuck in a Monitor.Wait. Strange Indeed. Running the application a few thousand times under the debugger would potentially not have shown me what the reason was so I decided to what I call constructive debugging. I did create a simple Console application project and try to simulate the exact circumstances when the crash did happen from the information I have via memory dump and source code reading. The thread that was  crashing was actually MS code from an old version of the Microsoft Caching Application Block. From reading the code I could conclude that the main thread did call the Dispose method on the CacheManger class which did call Thread.Interrupt on the cache scavenger thread which was just waiting for work to do. My first version of the repro looked like this   static void Main(string[] args) { Thread t = new Thread(ThreadFunc) { IsBackground = true, Name = "Test Thread" }; t.Start(); Console.WriteLine("Interrupt Thread"); t.Interrupt(); } static void ThreadFunc() { while (true) { object value = Dequeue(); // block until unblocked or awaken via ThreadInterruptedException } } static object WaitObject = new object(); static object Dequeue() { object lret = "got value"; try { lock (WaitObject) { } } catch (ThreadInterruptedException) { Console.WriteLine("Got ThreadInterruptException"); lret = null; } return lret; } I do start a background thread and call Thread.Interrupt on it and then directly let the application terminate. The thread in the meantime does plenty of Monitor.Enter/Leave calls to simulate work on it. This first version did not crash. So I need to dig deeper. From the memory dump I did know that the finalizer thread was doing just some critical finalizers which were closing file handles. Ok lets add some long running finalizers to the sample. class FinalizableObject : CriticalFinalizerObject { ~FinalizableObject() { Console.WriteLine("Hi we are waiting to finalize now and block the finalizer thread for 5s."); Thread.Sleep(5000); } } class Program { static void Main(string[] args) { FinalizableObject fin = new FinalizableObject(); Thread t = new Thread(ThreadFunc) { IsBackground = true, Name = "Test Thread" }; t.Start(); Console.WriteLine("Interrupt Thread"); t.Interrupt(); GC.KeepAlive(fin); // prevent finalizing it too early // After leaving main the other thread is woken up via Thread.Abort // while we are finalizing. This causes a stackoverflow in the CLR ThreadAbortException handling at this time. } With this changed Main method and a blocking critical finalizer I did get my crash just like the real application. The funny thing is that this is actually a CLR bug. When the main method is left the CLR does suspend all threads except the finalizer thread and declares all objects as garbage. After the normal finalizers were called the critical finalizers are executed to e.g. free OS handles (usually). Remember that I did call Thread.Interrupt as one of the last methods in the Main method. The Interrupt method is actually asynchronous and does wake a thread up and throws a ThreadInterruptedException only once unlike Thread.Abort which does rethrow the exception when an exception handling clause is left. It seems that the CLR does not expect that a frozen thread does wake up again while the critical finalizers are executed. While trying to raise a ThreadInterrupedException the CLR goes down with an stack overflow. Ups not so nice. Why has this nobody noticed for years is my next question. As it turned out this error does only happen on the CLR for .NET 4.0 (x86 and x64). It does not show up in earlier or later versions of the CLR. I have reported this issue on connect here but so far it was not confirmed as a CLR bug. But I would be surprised if my console application was to blame for a stack overflow in my test thread in a Monitor.Wait call. What is the moral of this story? Thread.Abort is evil but Thread.Interrupt is too. It is so evil that even the CLR of .NET 4.0 contains a race condition during the CLR shutdown. When the CLR gurus can get it wrong the chances are high that you get it wrong too when you use this constructs. If you do not believe me see what Patrick Smacchia does blog about Thread.Abort and List.Sort. Not only the CLR creators can get it wrong. The BCL writers do sometimes have a hard time with correct exception handling as well. If you do tell me that you use Thread.Abort frequently and never had problems with it I do suspect that you do not have looked deep enough into your application to find such sporadic errors.

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• Channel 9 Video:SharePoint and WCF

  - by Sahil Malik

  Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). A VERY LONG TIME AGO :), Zhiming from Microsoft and I got together and talked a bit about why WCF is such a big deal in SharePoint. In this video we talk a bit about why SharePoint has been so successful. And why WCF in SharePoint can have a great positive impact on your productivity. A lot of what I say in that video is still applicable to SP2010, but that video was recorded before there was ANY information out in the general world about SP2010. Well, that video is now finally online .. enjoy! :) Comment on the article ....

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• Vancouver .NET User Group

  - by pluginbaby

  While in Vancouver for my Silverlight training in early May, I will give a free Silverlight presentation at the local .NET User Group, .netBC. When: May 5, 2010, 6:30 PM Where: Building SW3 room 1750, BCIT Burnaby Campus, 3700 Willingdon Ave, Burnaby, BC, V5G 3H2 What: Silverlight 4 Business Applications “In this session a live demo will be built to show the new features of Silverlight 4 that helps you create business-oriented applications easier than ever. Importing/exporting data, printing, drag drop target, data visualization, context menu, WCF RIA Services and design-time enhancements in Visual Studio 2010.” Read all the details here: http://www.netbc.ca/DNCal/EventDetail.aspx?date=2010/05/05 See you there!   Thanks Telerik for helping this event to happen!   Technorati Tags: Silverlight,Silverlight Training

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• No windows whatsoever after compiz reset

  - by Shashank Singh

  Currently using 12.04. This time I was trying to use the application switcher, and it asked me to resolve a few conflicts most of which were not easy to comprehend. So after some yes and no dialogue boxes leading me nowhere, I thought a reset should set things fine. However, after preferences-reset to default, I can't see any window!! NONE whatsoever except the log out one when I press ctrl+alt+del All I can see is the wallpaper and the mouse pointer. I cant even see the terminal or anything when I press alt+f2. I am posting this when I switch to ubuntu 2d (I cant make out the difference between the two, but this just works for now almost the same way)

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• Loading content (meshes, textures, sounds) in the background

  - by Boreal

  In my game, I am aiming for a continuous world, that is, a world where you can go anywhere without breaking the immersion through load times and "virtual seams". My world is broken up into regions, which are nodes in a graph. A region is considered adjacent to another if it can be travelled to or seen from that region. In order to keep this continuous, I want to preload the assets needed in the adjacent regions (such as world meshes, textures, and music) before they are actually used. As for actually loading the content, I use a manager that keeps at most one copy of each asset in memory at a time, accessible by its filename. When I try to access an asset, it loads it (if necessary) and then returns it. I can then unload any asset that is currently loaded to save memory. Clearly, I want to do this in the background so there are no hiccups. I assume I have to use threads in some way, but I'm not sure how.

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• How to avoid getting carried away with details?

  - by gablin

  When I program, I often get too involved with details. There might be some little thing that doesn't do exactly what I want it to, or maybe there's some little feature I want to add. Either way, none are really essential to the application - it's just a minor niusance (if any). However, when trying to fix it, I may happen to spend way more time on it than I planned, and there are things much more important that I should be doing instead of dealing with this little detail. What can I do to avoid getting carried away with details, when there's more essential things that need doing? (I didn't know how to tag this question, so feel free to add whatever appropriate tags that are missing.)

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• PPTP VPN connection with dd-wrt terminates

  - by StalkerNOVA

  I have problems with connection to DD-WRT router with PPTP server installed. Win7 has no problems with connection to it. But in Ubuntu I'm getting all the time: Dec 28 21:52:14 IT-nb pppd[4209]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded. Dec 28 21:52:14 IT-nb pppd[4209]: pppd 2.4.5 started by root, uid 0 Dec 28 21:52:14 IT-nb pppd[4209]: Using interface ppp0 Dec 28 21:52:14 IT-nb pppd[4209]: Connect: ppp0 <--> /dev/pts/2 Dec 28 21:52:18 IT-nb pppd[4209]: Connection terminated. Dec 28 21:52:18 IT-nb pppd[4209]: Exit.

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• Issues while trying to install Xsane

  - by Sebastian

  :) I am sort of new in the world of Linux. I installed Zorin OS and I am very happy with it. My only problem is that I would like to be able to use my scanner. My Kodak printer works fine, but the scanner is not detected; therefore, I am trying to install Xsane. The issue remains, every time that I try to install it, and error message comes up saying; "Package dependencies cannot be resolved" What can I do? thanks!

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• Standard -server to server- and -browser to server- authentication method

  - by jeruki

  I have server with some resources; until now all these resources were requested through a browser by a human user, and the authentication was made with an username/password method, that generates a cookie with a token (to have the session open for some time). Right now the system requires that other servers make GET requests to this resource server but they have to authenticate to get them. We have been using a list of authorized IPs but having two authentication methods makes the code more complex. My questions are: Is there any standard method or pattern to authenticate human users and servers using the same code? If there is not, are the methods I'm using now the right ones or is there a better / more standard way to accomplish what I need? Thanks in advance for any suggestion.

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• Dynamic MMap ran out of room when trying to sudo apt-get anything

  - by user1610406

  I was having an error in Update Manager that asks me to do a partial upgrade and it fails. Now I can't sudo apt-get install anything. I tried to fix it, and now I can't sudo apt-get anything. Every time, I get this output: Reading package lists... Error! E: Dynamic MMap ran out of room. Please increase the size of APT::Cache-Limit. Current value: 25165824. (man 5 apt.conf) E: Error occurred while processing libuptimed0 (NewVersion1) E: Problem with MergeList /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_lucid_universe_binary-i386_Packages W: Unable to munmap E: The package lists or status file could not be parsed or opened. I have no idea why this is happening or how to fix it, and I fear that if I try something that probably doesn't work that it will make my problem worse. (Just for reference I am currently running 10.04 (Lucid) on my machine.)

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• How do I create a curved line or filled circle or generally a circle using C++/SDL?

  - by NoobScratcher

  Hello I've been trying for ages to make a pixel circle using the putpixel function provided by SDL main website here is that function : void putpixel(int x,int y , int color , SDL_Surface* surface) { unsigned int *ptr = static_cast <unsigned int *> (surface->pixels); int offset = y * (surface->pitch/sizeof(unsigned int)); ptr[offset + x] = color; } and my question is how do I curve a line or create an circle arc of pixels or any other curved shape then a rectangle or singular pixel or line. for example here are some pictures filled pixel circle below enter link description here now my idea was too change the x and y value of the pixel position using + and - to create the curves but in practice didn't provide the correct results what my results are in this is to be able to create a circle that is made out of pixels only nothing else. thank you for anyone who takes the time to read this question thanks! :D

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• Google I/O 2010 - Customizing Google Apps

  Google I/O 2010 - Customizing Google Apps Google I/O 2010 - Customizing Google Apps & integrating with customer environments Enterprise 201 Mike O'Brien, Matt Pruden (Appirio), Adam Graff (Genentech), Don Dodge (moderator) Learn from real life examples of customizing Google Apps to meet customer requirements. Hear from the customer (Genentech) and the System Integrator (Appirio). Explore integration issues and deployment best practices with people who have done it. Get your questions answered in this session. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 52:00 More in Science & Technology

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• Will we ever lose the human touch?

  - by divya.malik

  I was at a conference two weeks ago, which was targeted to sales and marketing professionals. The discussions around the changing scenario in sales was very interesting. More and more of selling is moving to the internet- sales people are delivering more of their presentations online, or via the phone. Budget constraints and new technologies have dramatically decreased the need for face-to-face interactions. At the same time, customers are also researching for products on their own, taking the advice of peers, making up their mind, and then contacting the vendor. That takes care of more than half of the usual selling process. But humans are social animals, and because of that I believe that despite these changing trends and technologies, the need to maintain the human touch will always be necessary. One of the presenters at the conference shared this video, which stayed in my mind.

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• Save to Hard Drive instead of bootable USB

  - by WAM

  I followed the instructions on the Ubuntu website on how to put Ubuntu 12.04 on a USB and make it a bootable USB stick for windows. It worked fine and I can boot up and run Ubuntu, but every time I try to download software or change settings it tries to save it to the USB rather than the hard drive built into the computer. The USB doesn't have enough space so the download fails and in addition it doesn't retain setting changes so when I restart my computer all the settings return to default and anything I saved is gone. Is there any way to change things so that when I download software or change settings Ubuntu will save it to my hard drive instead of the USB?

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• How to categorize textures into atlases

  - by Esa

  I am going to use texture atlasing for the first time in my games, and at first it seemed like a great idea to split textures into atlases by categorizing them by terrain themes e.g ForestTextures, WinterTextures etc. But that could cause a problem when for example a flower has to use transparency shader and other models use a diffuse shader. So those cannot be atlased into the same texture. Thus, would atlasing textures into themes as mentioned before and then splitting them by shader like ForestDiffuse and ForestTransparent be good? Or is there a better way to categorize and build them?

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• Is Ubuntu running well on an usb hdd? Need suggestions

  - by Klaus

  Dear Linux and Ubuntu pros, I have here a company notebook, and because the hdd is full encrypted I cannot install an extra partition for another system that I would like to use in my free time. And I really need another system, because this crap windows here with that much of antivirus, antispyware, anti-whatever on it is sooo slow and anoying. What can I do? I could use an external usb hdd with another system. Because I would like to handle big files and so on, I dont want to use an sub stick. An usb 2.5hdd + ubuntu is what I think the best option. Here are my question: Do I have to note something? Is Ubuntu running well on an external hdd? Do I have big performance problems (because of the usb hdd)? Should I buy a very fast hdd for much money or is it not that important? Any suggestions? Thank you :)

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• USB Audio Device Loopback Through Speakers

  - by matto1990

  I have a USB turntable which when plugged in to my ubuntu 10.10 machine appears in the audio settings as an input device (USB PnP Audio Device Analog Stereo) like a microphone. What I'd like to be able to do it to have the sound for that audio device played back through the audio output (speaker or whatever). I'm not too worried if there's a slight delay between the audio coming in and it being played out through the speakers. As far as I'm aware this is refereed to as software loopback. I can achieve exactly what I want if I open Audacity, enable software loopback and press record. Obvious this isn't ideal as I don't really want it recording what I'm playing all the time. I know this is possible because of the Audacity example however I'd like to know if there's a way to do it without it recording. I've search around for a while for a piece of software that does this, however I couldn't get anything even close. Any help would be greatly appreciated.

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• How to improve testing your own code

  - by Peter

  Today I checked in a change on some code which turned out to be not working at all due to something rather stupid yet very crucial. I feel really bad about it and I hope I finally learn something from it. The stupid thing is, I've done these things before and I always tell myself, next time I won't be so stupid... Then it happens again and I feel even worse about it. I know you should keep your chin up and learn from your mistakes but here's the thing: I try to improve myself, I just don't see how I can prevent these things from happening. So, now I'm asking you guys: Do you have certain groundrules when testing your code?

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