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  • poor performance while exporting data to excel from DB2

    - by Naga
    I am facing a performance issue while exporting data from DB2 to Excel 2003. Well the very first reason is file is about 10+ MB where it goes outofMemory Exception. I am using XLSTransformer and HSSFWorkbook classes to transform my xls file. I also have joins in my query( optional). But user most likely is going to choose these options. When they do so, of course, the data becomes huge and take lot of time and some times goes outOfMemory too. So Please advice me on this.

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  • Website directory structure regarding subdomains, www, and "global" content

    - by Pawnguy7
    I am trying to make a homemade HTTP server. It occurs to me, though, I never fully understood what you might call "relativity" among web pages. I have come across that www. is a subdomain, and I understand its original purpose. IT sounds like, in general, you would redirect (is that 301 or 302?) it to a... non-subdomain, sort of. As in, redirecting www.example.com to example.com. I am not entirely sure how to make this work when retrieving files for an HTTP server though. I would assume that example.com would be the root, and www manifests as a folder within it. I am unsure. There is also the question of multi-level subdomains, e.g. subdomain2.subdomain1.example.com. It seems to me they are structured "backwards", where you go from the root left in folder structure. In this situation, subdomain2 is a directory within subdomain1, which is a directory in the root. Finally, it occurs to me I might want a sort of global location. For example, maybe all subdomains still use an image as a logo. It makes more sense to me that there is one image, rather than each having a copy. In the same way, albiet more doubtfully, you might have global CSS (though that is a bit contrary to the idea of a subdomain in the first place), or a javascript that is commonly used. (more efficient than each having its copy and better for organization purposes). Finally, mabye you have a global 404 page. I think this might be the case where you have user-created subdomains (say bloggername.example.com), where example.com still has a default 404 when either a subdomain does not exist or page does not exists under a valid blogger. I am confused on what the directory structure for this should be. To summarize: Should and how it have a global files not in a subdirectory, how should www. be handled, (or how a now www or other subdomain should be handled), and the pattern for root/subdomain, as well as subdomain within subdomains (order-wise). Sorry this is multiple questions, but I feel at the root they are all related to the directory.

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  • Need to test .properties one by one in every possibility?

    - by ??? Shengyuan Lu
    For example, there are some key-value configuration in .properties file. Such like someFeatureEnable=true. It must be bool type value which will be parsed by framework, in my case it's typical Java Spring configuration. Spring will handle the configuration and throw Exception when users set someFeatureEnable=123. My question is: if there many properties in .properties file, Is it worth testing them one by one? It's quite troublesome and low priority. The .properties file is always configured by tech administrator stuff. Limited chances that they will mess up the configuration. Thanks!

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  • Box2D random crash when adding joints

    - by user46624
    I'm currently working on a project which uses Box2D, when the player uses a certain key it should anchor to the ground. For that I use a weld joint, but when I add the joint the game will sometimes crash, it has a 1/10 change to crash. The error I recieve: Showing the controller Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 11 at org.jbox2d.dynamics.Island.add(Island.java:577) at org.jbox2d.dynamics.World.solve(World.java:1073) at org.jbox2d.dynamics.World.step(World.java:598) The code for adding the joints: WeldJointDef def = new WeldJointDef(); def.initialize(body, anchoredObject.body, body.getWorldCenter()); weldJoint = (WeldJoint) world.createJoint(def); I still get the error if I synchronize it

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  • Application trying to use the wrong shared library

    - by Josh
    I'm having a problem with a program (quartus) running on my ubuntu machine. I'm getting the following error. quartus: symbol lookup error: /usr/lib/i386-linux-gnu/libXi.so: undefined symbol: XESetWireToEventCookie I have the correct libXi.so.6.0.0 file but no matter where I put it, the OS won't use it unless I apt-get remove libxi-dev, but a lot of software uses this libXi. What I want to do is add some sort of exception to the dynamic linker so that quartus uses the libXi.so that it needs and everything else still uses the one in /usr/lib/i386-linux-gnu. Thanks!

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  • Using linq to parse file [closed]

    - by Emaan Abdul majeed
    i am working parsing textfile using LINQ but got struc on it,its going outof range exception string[] lines = File.ReadAllLines(input); var t1 = lines .Where(l => !l.StartsWith("#")) .Select(l => l.Split(' ')) .Select(items => String.Format("{0}{1}{2}", items[1].PadRight(32), //items[1].PadRight(16) items[2].PadRight(32), items[3].PadRight(32))); var t2 = t1 .Select(l => l.ToUpper()); foreach (var t in t2) Console.WriteLine(t); and file is about 200 to 500 lines and i want to extract specific information so i need to split that information to different structure so how to do it this..

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  • How to write this kind of java source in clojure. [closed]

    - by tikky
    I want to know how to write a clojure code by looking at a java code like this. import xxxxxx import com.vaadin.terminal.gwt.server.AbstractApplicationServlet; public class Clojure4Vaadin extends AbstractApplicationServlet { @Override protected Class <? extends Application > getApplicationClass() throws ClassNotFoundException { return Application.class; } @Override protected Application getNewApplication(HttpServletRequest request) throws ServletException { try { RT.load(getServletConfig().getInitParameter("script-name"), true); //run Lisp function return (Application)RT.var(getServletConfig().getInitParameter("package-name"),getServletConfig().getInitParameter("function-name")).invoke(new String[0]); } catch (Exception e) { throw new ServletException(e); } } } I need to write a code clojure code which can do the sane thing that this java code can do.

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  • Why C# is not statically typed but F# and Haskell are?

    - by ??????? ???????
    There was a talk given by Brian Hurt about advantages and disadvantages of static typing. Brian said that by static typing he don't mean C#, but F# and Haskell. Is it because of dynamic keyword added to C#-4.0? But this feature is relatively rarely useful. By the way, there are ? and unsafeCoerse in Haskell which obviously are not the same, but something that could blown your head off in runtime similarly like exception thrown as a result of dynamic. Finally, why F# and Haskell could be named a statically typed languages and C# couldn't?

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  • New Development Snapshot

    I got a little side tracked by the investigation of the Google Collections test suite performance issue, reported by Albert Strasheim in the comments to the previous snapshot. This caused me to do some work on exception handling (unfortunately without any performance benefit to the Google Collections test suite) which, in turn, triggered something I've been wanting to do for while, namely to introduce a stub version of IKVM.OpenJDK.Core.dll which can...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Microsoft XNA code sample wont work with blender model

    - by FreakinaBox
    I downloaded this code sample and integrated it into my game http://xbox.create.msdn.com/en-US/education/catalog/sample/mesh_instancing It works with the model that they supplied, but throws and exception whenever I use one of my models. The current vertex declaration does not include all the elements required by the current vertex shader. TextureCoordinate0 is missing. I tried pluging my model into their original source code and same thing. My model is an fbx from blender and has a texture. This is the function that throws the error GraphicsDevice.DrawInstancedPrimitives( PrimitiveType.TriangleList, 0, 0, meshPart.NumVertices, meshPart.StartIndex, meshPart.PrimitiveCount, instances.Length );

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  • Top Down bounds of vision

    - by Rorrik
    Obviously in a first person view point the player sees only what's in front of them (with the exception of radars and rearview mirrors, etc). My game has a top down perspective, but I still want to limit what the character sees based on their facing. I've already worked out having objects obstruct vision, but there are two other factors that I worry would be disorienting and want to do right. I want the player to have reduced peripheral vision and very little view behind them. The assumption is he can turn his head and so see fairly well out to the sides, but hardly at all behind without turning the whole body. How do I make it clear you are not seeing behind you? I want the map to turn so the player is always facing up. Part of the game is to experience kind of a maze and the player should be able to lose track of North. How can I turn the map rather than the player avatar without causing confusion?

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  • while(true) and loop-breaking - anti-pattern?

    - by KeithS
    Consider the following code: public void doSomething(int input) { while(true) { TransformInSomeWay(input); if(ProcessingComplete(input)) break; DoSomethingElseTo(input); } } Assume that this process involves a finite but input-dependent number of steps; the loop is designed to terminate on its own as a result of the algorithm, and is not designed to run indefinitely (until cancelled by an outside event). Because the test to see if the loop should end is in the middle of a logical set of steps, the while loop itself currently doesn't check anything meaningful; the check is instead performed at the "proper" place within the conceptual algorithm. I was told that this is bad code, because it is more bug-prone due to the ending condition not being checked by the loop structure. It's more difficult to figure out how you'd exit the loop, and could invite bugs as the breaking condition might be bypassed or omitted accidentally given future changes. Now, the code could be structured as follows: public void doSomething(int input) { TransformInSomeWay(input); while(!ProcessingComplete(input)) { DoSomethingElseTo(input); TransformInSomeWay(input); } } However, this duplicates a call to a method in code, violating DRY; if TransformInSomeWay were later replaced with some other method, both calls would have to be found and changed (and the fact that there are two may be less obvious in a more complex piece of code). You could also write it like: public void doSomething(int input) { var complete = false; while(!complete) { TransformInSomeWay(input); complete = ProcessingComplete(input); if(!complete) { DoSomethingElseTo(input); } } } ... but you now have a variable whose only purpose is to shift the condition-checking to the loop structure, and also has to be checked multiple times to provide the same behavior as the original logic. For my part, I say that given the algorithm this code implements in the real world, the original code is the most readable. If you were going through it yourself, this is the way you'd think about it, and so it would be intuitive to people familiar with the algorithm. So, which is "better"? is it better to give the responsibility of condition checking to the while loop by structuring the logic around the loop? Or is it better to structure the logic in a "natural" way as indicated by requirements or a conceptual description of the algorithm, even though that may mean bypassing the loop's built-in capabilities?

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  • How to ensure that a member variable is initialized before calling a class method

    - by Omkar Ekbote
    There's a class with a parametrized constructor that initializes a member variable. All public methods of the class then use this member variable to do something. I want to ensure that the caller always creates an object using the parametrized constructor (there is also a setter for this member variable) and then call that object's methods. In essence, it should be impossible for the caller to call any method without setting a value to the member variable (either by using the parametrized constructor or the setter). Currently, a caller can simply make an object using the default constructor and then call that object's method - I want to avoid checking whether or not the member variable is set in each and every one of the 20-odd methods of the class (and throw an exception if it is not). Though a runtime solution is acceptable (better than the one I mentioned above); a compile-time solution is preferable so that any developer will not be allowed to make that mistake and then waste hours debuggging it!

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  • Spotlight on an office - Nairobi, Kenya

    - by Maria Sandu
    Hi everyone, my name is Joash Mitei. I am a graduate Intern at Oracle Systems Kenya and I will briefly take you through our offices and the working environment here in Nairobi, Kenya. I’ve been with Oracle since February 2012 and I’m responsible for Applications Pre-sales focusing on Oracle EPM and E-Business Suite. My background is Finance and Accounting therefore joining Oracle was almost a totally a different ball game but the transition has been smooth. The Oracle offices here are located on the second floor of Mebank Towers. We moved to the 2nd floor just three months ago from the 5th floor mainly because of the growing workforce. We are covering the whole Eastern Africa region hence diversity in culture is evident. This is a plus since you get to interact with people of very different backgrounds, cultures and ways of thinking. The building itself is on the outskirts of the CBD hence free from the hustle and bustle of the town. The office is split into different sections; there is a main working area which has an open desk design that fosters interaction between colleagues, there are 4 conference rooms for meetings and presentations, there are 3 quiet rooms for a little privacy when needed and there is a dining area for meals and ‘hanging out’. The working environment is world-class, to say the least. The employees are very professional, quite smart and needless to say, very busy. There are 4 interns covering sales and pre-sales in both Tech and Apps. As an intern you get support from your supervisor but you are required to show initiative yourself and thus the need to be very pro-active and inquisitive. The local management is well structured and communicative to ensure effectiveness and efficiency in the office. Apart from the daily work, we usually have events to boost staff morale such as ‘TGIF hang -out’, football matches against each other or versus other companies, and team building retreats. All these are monumental in fostering the RED POTENTIAL. We also do numerous CSR activities in the local communities . Well, that’s the Kenyan office for you. Glad to be your tour guide. Have a superb day!

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  • Choosing a new programming language to learn [on hold]

    - by Xelom
    I'm a Microsoft Stack(ASP.NET, C#) developer. Mainly, I develop server side software, windows services, restful apis etc. My client side interaction is really really low. So aside from C# I want to learn a new language. Time is precious and I want to give my focus to a language which have a future. My language list is: Scala (Powerful usage in Twitter) Go (Getting popular and channels are pretty awesome) Erlang (Stable server side programs. Used at Whatsapp) You can give advice for the above or you can give me a better option. My only exception is Objective-C. I don't want to get in that one. Thanks

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  • Kernel Panic while Installing Ubuntu 12.10 from USB Drive

    - by user100889
    Good evening, I recently looked into installing Ubuntu alongside my Windows. I was able to mount the iso on a USB drive using Universal USB Installer. I verified it with the MD5sum utility and the hash is correct. When installing, I can get to the screen where I choose the boot order, select the USB drive, and then I get to a screen where Ubuntu seems to be 'loading' (purple background with Ubuntu logo and name in the middle). Then, all of a sudden, I get a "Kernel Panic - Not syncing: fatal exception in interrupt" error message. My specs : Intel Core 2 Duo CPU T5850 @ 2.16 GHz / 4 GB of ram / Packard Bell computer from 2007. / Windows 7 Ultimate x64 installed. What should I do now ? Thanks for your help.

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  • Android game scrolling background

    - by Stevanicus
    Hi There, I'm just trying to figure out the best approach for running a scolling background on an android device. The method I have so far.... its pretty laggy. I use threads, which I believe is not the best bet for android platforms @Override public void run() { // Game Loop while(runningThread){ //Scroll background down bgY += 1; try { this.postInvalidate(); t.sleep(10); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } where postinvalidate in the onDraw function simply pushings the background image down canvas.drawBitmap(backgroundImage, bgX, bgY, null); Thanks in advance

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  • L'App Store génère toujours quatre fois plus de revenus que Google Play, mais la galerie d'Android augmente rapidement son CA

    L'App Store génère toujours quatre fois plus de revenus que Google Play Mais la galerie de Google augmente rapidement son chiffre d'affaires d'après App Annie Les études sur les galeries applicatives se suivent et se ressemblent toutes un peu. L'Index de App Annie ne fait pas exception. En résumé, d'après cette analyse, Google Play est en très forte croissance? mais reste beaucoup moins rentable que l'App Store d'Apple. En octobre, le chiffre d'affaires (CA) de la galerie de Google a certes triplé (+ 313 %) par rapport à janvier quand celle des iDevices ne progressait « que » de 12.9 %. Mais au final c'est bien un Apple qui qui génèrerait le plus de revenus a...

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  • Getting "server certificate verification failed" during apt-get update

    - by mydoghasworms
    I am trying to update a system using an HTTPS package mirror located here: https://mirror.ufs.ac.za/os/linux/distros/ubuntu/ubuntu/ However, during apt-get update, I get the following message: Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none If you visit the site in your browser, you are warned about the site's certificate, but I trust the site, so it's not an issue for me. I assume I must be able to add this exception somewhere for apt to proceed. Can you tell me where and how?

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  • What are you using the debugger for? [closed]

    - by Peter Gfader
    Some scenarios that I can think of: Reading/Understanding code Understanding the flow (what happens when) Stop program and see where it is up to a. Attach debugger b. Exception -- Debug Discover API Run to breakpoint and verify state The question got closed on SO, so I ask here... http://stackoverflow.com/questions/6462461/what-do-you-use-the-debugger-for What are you using the debugger for? Which scenario did you ran into, that you needed the debugger? Could you have done it differently?

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  • Missing error handling in Streaming-AJAX-Proxy Log

    - by Michael Freidgeim
    We are using AjaxProxy(FROM http://www.codeproject.com/KB/ajax/ajaxproxy.aspx) on our web site, but started to notice errors accessing log.txt file. I found that the file is created by Log class and doesn't have ability to switch it off and error handling. I've added reading file name from configuration and try/catch block   public static class Log     {         private static StreamWriter logStream;         private static object lockObject = new object ();     public static void WriteLine(string msg)         {                       string logFileName = ConfigurationExtensions.GetAppSetting("AjaxStreamingProxy.LogFile" ,"");                       if (logFileName.IsNullOrEmpty())                             return;                       try                      {                             if (logStream == null )                            {                                    lock (lockObject)                                   {                                           if (logStream == null )                                          {                            logStream = File.AppendText(Path .Combine(AppDomain.CurrentDomain.BaseDirectory, logFileName));                                          }                                   }                            }                            logStream.WriteLine(msg);                      }                       catch (Exception exc)                      {                             string ignoredMsg = String .Format("The error occured while logging {0}, but processing will continue.\n {1} ", exc);                             LoggerHelper.LogEvent(ignoredMsg, MyCategorySource, TraceEventType .Warning, true);                      }         }

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  • Is this a violation of the Liskov Substitution Principle?

    - by Paul T Davies
    Say we have a list of Task entities, and a ProjectTask sub type. Tasks can be closed at any time, except ProjectTasks which cannot be closed once they have a status of Started. The UI should ensure the option to close a started ProjectTask is never available, but some safeguards are present in the domain: public class Task { public Status Status { get; set; } public virtual void Close() { Status = Status.Closed; } } public ProjectTask : Task { public override void Close() { if (Status == Status.Started) throw new Exception("Cannot close a started Project Task"); base.Close(); } } Now when calling Close() on a Task, there is a chance the call will fail if it is a ProjectTask with the started status, when it wouldn't if it was a base Task. But this is the business requirements. It should fail. Can this be regarded as a violation?

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  • Printing Tip Handling User Initiated Dialogs Exceptions

    I see this question every so often so it makes sense to share it through a quick post. When using the print API in Silverlight 4 you can run into the dreaded exception: System.Security.SecurityException: Dialogs must be user-initiated Then you examine your code and confirm that your code where you invoke the PrintDocuments Print method are indeed being handled by a user-initiated event. If you are not invoking Print in a user-initiated event then your know your solution :) Here is some sample...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Can not export JARS in lwjgl!

    - by NerdyLegend
    I did it before but for some reason it's doing the stupid problem again. I want to export as a regular Jar file, not a folder full of files. I export it like in Oskar Veerhoak. cmd says Exception in thread "main" java.lang.RuntimeException: Resource not found: res/F lubberFlap.png at org.newdawn.slick.util.ResourceLoader.getResourceAsStream(ResourceLoa der.java:69) at com_FlubberSpace.MainFS.main(MainFS.java:118) I tested it out with my other project with the same code pretty much. This is how I load my Textures wood = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("res/wood.png")); of course it works fine in eclipse but not after export. I havn't tried giving the previous game its' own project, I have it in a package. Can someone record how to export properly? I want a jar file that you just double click to start it. I also want it so nobody can extract the files and see my classes and res.

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  • SMTP mailbox unavailable - intermittent and self-inflicted

    - by user134451
    I have an app that runs daily, sending confirmation emails to dozens of customers. Emails are sent using SMTP with authentication. The app also has some error handling, and occasionally anonymous SMTP is used to notify the webmaster that an e-mail issue has been encountered (a malformed email address, usually). Whenever these warning notifications are sent, the customer notifications that follow throw an error: "Mailbox unavailable. The server response was: 5.7.1 Unable to relay". The customer notification emails are sent, but my app drops into the exception handler. And all subsequent customer notification emails have this problem. Everything is fine next time the programs run, until a webmaster warning email is sent. Anyone have an ideas what would cause this? My first thought was that the client didn't like being switched back and forth between anonymous to authenticated modes. I created a separate client for each mode, but that didn't help.

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