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  • Null Pointer Exception on a 2D array (Java)

    - by user315156
    I have a class, "Tetris", in which one of the instance variables is "board". "board" is 2D array of Color objects. Upon the creation of a tetris object I call a method that sets the dimensions of board and then sets all of the Color objects to be the Default value, that is to say, Color.blue. public Tetris(int rows, int cols){ this.rows = rows; this.cols = cols; reset(rows, cols); } public void reset(int rows, int cols){ Color[][] board = new Color[rows][cols]; for(int i = 0; i Unfortunately, when I run the code (which obviously has not been posted in its entirety) I get a null pointer exception on the line: board[i][j] = DEFAULT_COLOR; // Color.blue; //DEFAULT-COLOR. Is there anything obviously wrong with what I am doing? (Sorry if there are glaring format issues, this is my first time on Stack Overflow)

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  • C++ project type: unicode vs multi-byte; pros and cons

    - by Stefan Valianu
    I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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  • Error with Dolphin Boonex Community Framework

    - by Yanki Twizzy
    I just finished moving files from my system to my web host and I am getting this error. I have manually changed the permissions of the tmp folder they are referring to but I keep getting the errror. Please could someone tell me what the problem could be Fatal error: Uncaught exception 'Exception' with message 'Please make sure the /home/sunnews/public_html/dolphin/plugins/phpids/IDS/../../../tmp/ folder is writable' in /home/sunnews/public_html/dolphin/plugins/phpids/IDS/Monitor.php:218 Stack trace: #0 /home/sunnews/public_html/dolphin/inc/security.inc.php(51): IDS_Monitor-__construct(Array, Object(IDS_Init)) #1 /home/sunnews/public_html/dolphin/inc/header.inc.php(172): require_once('/home/sunnews/p...') #2 /home/sunnews/public_html/dolphin/index.php(40): require_once('/home/sunnews/p...') #3 {main} thrown in /home/sunnews/public_html/dolphin/plugins/phpids/IDS/Monitor.php on line 218

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  • Algorithm on trajectory analysis.

    - by Arman
    Hello, I would like to analyse the trajectory data based on given templates. I need to stack the similar trajectories together. The data is a set of coordinates xy,xy,xy and the templates are again the lines defined by the set of control points. I don't know to what direction to go, maybe to Neural Networks or pattern recognition? Could you please advace me page, book or library to start with? kind regards Arman. PS. Is it the right place to ask the question?

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  • How to Handle UriFormatException in standard Web browser control in .Net Compact framework

    - by Sundar
    I have developed a browser in my application using the standard Web Browser control. It is throwing URIFormatException and the application crashes when navigating to some sites like "WWW.oosai.com" and also on clicking back or forward buttons when there is no internet connection. I tried handling the exception but it is not working try { webBrowser1.Navigate(new Uri(address)); } catch (System.UriFormatException) { return ; } the stack trace is like this bei System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) bei System.Uri..ctor(String uriString) bei System.Windows.Forms.WebBrowser.get_Url() bei System.Windows.Forms.WebBrowser.WnProc(WM wm, Int32 wParam, Int32 lParam) bei System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam) bei Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain) bei System.Windows.Forms.Application.Run(Form fm) bei Sts.Windows.Forms.FormRunner`1.GuiThread() In one of other topic a guy as said this exception is handled gracefully by the web browser but in my case am not to handle and moreover my application crashes with a error message like "Aarya.exe as performed an illegal operation and please report this to the administrator" Can anyone one help in handling the exception and is their any event to identify the availability of internet connection in web browser control

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  • Catch isn't working

    - by neoneye
    I'm baffled. What could be causing 'catch' not to be working and how do I fix it? <?php try { throw new Exception('BOOM'); error_log("should not happen"); } catch(Exception $e) { error_log("should happen: " . $e->getMessage()); } ?> Actual output [27-Apr-2010 09:43:24] PHP Fatal error: Uncaught exception 'Exception' with message 'BOOM' in /mycode/exception_problem/index.php:4 Stack trace: #0 {main} thrown in /mycode/exception_problem/index.php on line 4 Desired output should happen: BOOM PHP version 5.2.3 In php_info() I don't see anywhere exceptions could have been disabled. I have tried with "restore_exception_handler();" but that doesn't make the catch block working. I have also tried with "set_exception_handler(NULL);" but that neither make the catch block working. How do I get the desired output?

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  • How to obtain the native stacktrace from native exceptions caught in managed code

    - by aaa
    I have some managed code that calls to a method inside some native DLL(i have the appropriate symbol files). Sometimes, that native method throws an exception which I catch in my managed code. However, when i print the stacktrace from my caught exception, I see only managed code (the last frame is the call to the native code .. but it don't see the stacktrack within the native code). How can I obtain the native callstack as well? *When i'm debugging the code, i am able to step into the native code, and see the actuall call stack.

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  • Visual Studio 2008 built-in web server needs integrated pipeline mode - How?

    - by jdk
    Using Visual Studio 2008 and built-in web server. In a Web Handler .ashx file public void ProcessRequest(HttpContext context) { context.Response.ContentType = MimeType_text_xvcard; context.Response.Headers.Add(HttpHeader_ContentLength, "2138"); when I try to add an HTTP header I get the exception: This operation requires IIS integrated pipeline mode. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.PlatformNotSupportedException: This operation requires IIS integrated pipeline mode. I can find information about this error on the Internet but need specific info about how to presumably enable Integrated Pipeline mode (through web.config?) to allow HTTP headers to be manipulated. How do do I put the built-in web server into integrated pipeline mode? Note: Not using full-fledged IIS

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  • Which are the Extreme Programming "core" practices?

    - by MiKo
    Recently, I began reading about agile methodologies and XP in particular. I am a bit confused, though, about what are considered the practices involved in extreme programming. More precisely: Wikipedia reports 12 practices, which I someway believe to be the "classic" ones. Both Kent Beck and Ron Jeffries indicate 13 practices (you can find the links at the bottom of wikipedia page about "Extreme Programming Practices", I cannot post them here since I am new user of Stack Overflow), while this review of Kent Beck's "XP explained" (2nd edition) report more than 20 somewhat different practices. As a complete beginner in the topic (and basically as a complete beginner as a programmer), I would like to be enlightened on the matter. My impression is that I should look at Beck's book, since the second edition has been written after several years of XPerience, but I can find a lot less material based on that.

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  • Error in java code.

    - by user243680
    I am getting the following error when i try to use a blue tooth dongle to transfer a video file from pc to mobile phone. does anyone know run: BlueCove log redirected to log4j log4j:WARN No appenders could be found for logger (com.intel.bluetooth). log4j:WARN Please initialize the log4j system properly. BlueCove version 2.1.0 on bluesoleil java.io.IOException: Device not discovered BlueCove stack shutdown completed at com.intel.bluetooth.BluetoothStackBlueSoleil.connectionRfOpenClientConnection(BluetoothStackBlueSoleil.java:361) at com.intel.bluetooth.BluetoothRFCommClientConnection.<init>(BluetoothRFCommClientConnection.java:37) at com.intel.bluetooth.MicroeditionConnector.openImpl(MicroeditionConnector.java:379) at com.intel.bluetooth.MicroeditionConnector.open(MicroeditionConnector.java:162) at javax.microedition.io.Connector.open(Connector.java:83) at de.avetana.obexsolo.OBEXConnector.open(OBEXConnector.java:103) at OBEXTest.main(OBEXTest.java:23)

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  • SQL Server Account will work for SQLSERVER but fails to ReportServer

    - by Larry
    Setting up SSRS. For Service Account, 1. I set a domain account as the Report Server Service Account. 2. click apply 3. SQL Server Connection Dialog pops up. Need to specify an account with admin privileges. i. set Credentials Type = SQL Server Account ii. I use sa account (which works, verified many ways with sql server management studio) I fails with the following: System.InvalidOperationException: Cannot start service ReportServer on computer 'DEVDB5'. --- System.ComponentModel.Win32Exception: The service did not start due to a logon failure --- End of inner exception stack trace --- at System.ServiceProcess.ServiceController.Start(String[] args) at System.ServiceProcess.ServiceController.Start() at ReportServicesConfigUI.Panels.WindowsServiceIdentityPanel.StartWindowsServicePostChangeWindowsServiceIdentity(ServiceController rsService) What am I doing wrong. btw: it was working fine as of yesterday. I originally set up SSRS a few days ago using the sa account

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  • Are there any code libraries that validate/convert blog comments to XHTML strict?

    - by Matthew James Taylor
    I am working on a website in PHP where people can make comments similar to a blog, and I only want particular tags to be allowed. Are there any pre-built libraries that process comments and produce valid XHTML Strict code? I would need to do this in JavaScript so I can generate a live preview like Stack Overflow, plus in PHP before saving it to a MySQL database. The allowed HTML tags will be: strong, em, blockquote, and links (rel=nofollow not required) One way would be to allow people to directly enter the HTML into the comment field but I would prefer to use a simple mark up something like this (can be different - this is an example): *strong* _em_ [blockquote] http://www.link.com I want line breaks to be converted to <br />. Are there any code libraries that do the above?

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  • realistically speaking, could a seasoned .net developer enter the java space and land a job?

    - by mrblah
    I've been working with .net since 2001, and I am considering making a move into the java space. I find that java has so many more mature tools (hibernate is more mature, spring framework, established patters/designs, containers, distributed cache frameworks, etc etc.) I have been doing .net, and just recently I have been getting into design patterns, ORMS, etc. and it just seems the .net side of things are not as mature. Yes the trend going forward looks great as more and more are getting into this design strategy etc. I don't want this to get into a flame war, but I read that its not about the framework/stack, but the tools around it are what make the difference. And to me Java seems to be the winner. Anyhow, the real question here is, could I realistically get into shape in 6 months? i.e. Someone would consider hiring me, and not at a junior dev pay rate? Is this a bad idea?

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  • Xcode custom project template creates only references to files

    - by user315374
    Hi, I tried to create a custom project template for setting up unit testing. The problem is that when i create a new project based on this template it creates references to the template files : When i edit a file, it changes my template files instead of my actual project files ! When i delete my template, files from my actual project becomes red ! The project template is in : /Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Project Templates/Application/Test-based Application Reading some question on stack overflow i tried to install my template project in /Library/Application Support/Developer/Shared/Xcode/Project Templates But i cannot see my template when i create a new project. Can anybody help ? Thanks, Vincent

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  • ASP.NET mvc on mono 2.2

    - by Markus
    Hi, I am having a trouble. I am trying to run asp.net mvc 1.0 on mono 2.2.I have copied the system.web.mvc.dll to bin directory. I have done HttpContext.Current.RewritePath("/Home/Index");. Still I am having te error: Server Error in '/' Application The incoming request does not match any route Description: HTTP 500. Error processing request. Stack Trace: System.Web.HttpException: The incoming request does not match any route at System.Web.Routing.UrlRoutingHandler.ProcessRequest (System.Web.HttpContextBase httpContext) [0x00000] at System.Web.Routing.UrlRoutingHandler.ProcessRequest (System.Web.HttpContext httpContext) [0x00000] at System.Web.Routing.UrlRoutingHandler.System.Web.IHttpHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] at MvcApplication4._Default.Page_Load (System.Object sender, System.EventArgs e) [0x00000] at System.Web.UI.Control.OnLoad (System.EventArgs e) [0x00000] at System.Web.UI.Control.LoadRecursive () [0x00000] at System.Web.UI.Page.ProcessLoad () [0x00000] at System.Web.UI.Page.ProcessPostData () [0x00000] at System.Web.UI.Page.InternalProcessRequest () [0x00000] at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000] Version information: Mono Version: 2.0.50727.1433; ASP.NET Version: 2.0.50727.1433

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  • dismissModalViewControllerAnimated: crashes in Simulator but not on phone

    - by Jon
    I'm doing the following: [self.parentViewController dismissModalViewControllerAnimated:YES] This code fails using the Simulator but works with no issues on the phone itself. The Simulator's console shows no erros. I used NSLog statements to pinpoint this line of code as the culprit. When running on the phone, however, the console(windoworganizer) shows that the above code is executed and the application proceeds forward with no problem. When running the code in debugger, the following statement appears at the bottom of the Xcode debug window: GDB: Data Formatters temporarily unavailable, will re-try after a 'continue'. (Not safe to call dlopen at this time.) Then a window dispalys stating: Loading 43672 stack frames. (that sounds bad) In the debug window the following line appears numerous times: [UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] Without getting too deep into my code, does anyone know about or have experience with this type of condition? Thanks

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  • The Community-Driven GDB Primer

    - by fbrereto
    I was reading this question and realized it might be helpful for entry- and pro-level developers alike (including myself) to have a common reference for best practices in using gdb. Many questions asked on Stack Overflow could easily be solved by taking some time to step some code in a debugger, and it would be good to have a community-approved resource to "teach them how to fish", so to speak. Even for those seasoned veterans who occasionally find themselves in gdb when they are accustomed to a GUI-tastic debugger might benefit from those who are much more familiar with the command line tool. For starters (both to gdb and to prime this thread) I submit: Ninefinger's gdb primer The gdb quick reference guide, which is useful for telling you what commands are available but not how best to use them. My hope is this thread is a seed planted that is of continued value to the community. If by "continued value" the community decides to nix it altogether, well then the masses have spoken.

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  • an enter key are handled twice in WPF/Winform mixed project

    - by user527403
    I have a winform dashboard which hosts some WPF dialogs. When I select a row in the winform ListView and hit Enter key, OnItemActivate is called which launches a WPF dialog. However, the WPF dialog appears and then disappears immediately because the default button “cancel” is hit. It seems that the Enter key is triggered twice, one for launching the WPF dialog, the other for hitting cancel button. We don’t want the WPF dialog to be canceled by the Enter key hitting. According to the stack trace, it looks like that WPF and Winform handle the enter key separately. The WPF does not know that the enter key has been handled by the Winform ListView. Is this by design in Winform and WPF interop? To make the enter key not close the WPF dialog, we have to change the focus from the cancel button to another control (e.g. a textblock). Is there a better way to fix/around this issue?

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  • Using FourSquare API in a Rails App

    - by MikeH
    Anybody have any good resources that might be helpful in trying to integrate the FourSquare API into a Rails app? I'm specifically looking for a good tutorial. There doesn't seem to be much out there yet. There are a few ruby gems, but they are pretty bare bones and I need a bit more hand-holding. Here is a resource that I've found so far: http://tedgrubb.com/ Stack Overflow won't let me include a second hyperlink, but you can also google: Foursquare ruby gem for another resource. I have not done much work with APIs in the past, but I am very comfortable with Rails. What I need is a little better sense of exactly where all the pieces fit. A basic tutorial is what I'm looking for. Thanks.

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  • iPhone 4.0 SDK UIWebView crashes with DOMHTMLElement error..

    - by hytgbn
    My app have an UIWebView and I open a twitter oauth page with it. when I open oauth page , it works well. after I sign-in, it redirects to another page which have PIN code. and It crashes down with logs below. Is it a bug in 4.0 SDK? 2010-06-14 22:55:11.159 AllFx[1435:2003] -[DOMHTMLElement setHref:]: unrecognized selector sent to instance 0x74e4040 2010-06-14 22:55:11.162 AllFx[1435:2003] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DOMHTMLElement setHref:]: unrecognized selector sent to instance 0x74e4040' *** Call stack at first throw: ( 0 CoreFoundation 0x02b6c919 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x02cba5de objc_exception_throw + 47 2 CoreFoundation 0x02b6e42b -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x02ade116 ___forwarding___ + 966 4 CoreFoundation 0x02addcd2 _CF_forwarding_prep_0 + 50 5 DataDetectorsUI 0x0bde8ac4 -[WebTextIterator(DDExtensions) dd_doUrlificationForQuery:forResults:document:DOMWasModified:URLificationBlock:] + 1731 6 DataDetectorsUI 0x0bde2f09 -[DDOperation _doURLificationOnDocument] + 341 7 DataDetectorsUI 0x0bddff9c -[DDDetectionController _doURLificationOnWebThreadAndRelease:] + 563 8 CoreFoundation 0x02add42d __invoking___ + 29 9 CoreFoundation 0x02add301 -[NSInvocation invoke] + 145 10 WebCore 0x039fa2b3 _ZL15HandleAPISourcePv + 147 11 CoreFoundation 0x02b4dd7f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15 12 CoreFoundation 0x02aac2cb __CFRunLoopDoSources0 + 571 13 CoreFoundation 0x02aab7c6 __CFRunLoopRun + 470 14 CoreFoundation 0x02aab280 CFRunLoopRunSpecific + 208 15 CoreFoundation 0x02aab1a1 CFRunLoopRunInMode + 97 16 WebCore 0x039943c3 _ZL12RunWebThreadPv + 483 17 libSystem.B.dylib 0x98552a19 _pthread_start + 345 18 libSystem.B.dylib 0x9855289e thread_start + 34 ) terminate called after throwing an instance of 'NSException'

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  • Are there any JSF components for implementing breadcrumb navigation?

    - by kazanaki
    As far as I know there are two "kinds" of breadcrumbs. The static/hierarchy one Works like a stack Entries are pushed when a user goes "deeper" into the site Entries are poped when user goes "up" into the site Is the same for all users (for a given page) Shows location rather than history A simple Example would be HOME - BIG CATEGORY - SMALL CATEGORY - ARTICLE The dynamic/historical one Works like a queue Entries are pushed at the end when a user goes to another page Entries are removed from the front when the maximum size is reached Is different for each user, since it is personalized. Shows timeline/history instead of location. A simple example would be SMALL CATEGORY - HOME - BIG CATEGORY - HOME The question is: Are there any ready-made JSF component for these types of navigation?

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  • dotConnect LINQ to MySQL Issue

    - by Saravanan I M
    I am using dotConnect LINQ to MySQL and i have the following error. what would be the cause for this issue annot convert parameter value of type 'System.String' to MySQL type 'MySqlType.TimeStamp'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Cannot convert parameter value of type 'System.String' to MySQL type 'MySqlType.TimeStamp'. Source Error: Line 93: { Line 94: string loginLowered = login.ToLower(); Line 95: return context.ISVs.Where(u = u.Email == loginLowered).SingleOrDefault() == null; Line 96: Line 97: }

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  • Guessing the time zone from an arbitrary "location" string?

    - by Thomas
    I'm trying to run some statistics over the Stack Overflow data dump, and for that I would like to know the time zone for each user. However, all I have to go on is the completely free-form "location" string. I'll stress that I'm only looking for an approximation of the time zone; of course, in general this is an unsolvable problem. However, many people fill out their country, state and/or city, which should give a pretty good indication. It's okay if it fails for other cases. It doesn't have to be reliable, it doesn't have to be accurate, it doesn't have to cover all bases. I don't want to waste too much time on this, so I'm wondering if there is some code out there that can make a reasonable guess. Any language, platform, API or library goes. Any ideas?

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  • iPhone - how to find a parent View

    - by Oscar Peli
    Hi there, I need some help to find a View inside a hierarchy. Here is how I build up the View stack. Inside my first UITableViewController I push an UIViewController that contains an UITabBarController: [[self navigationController] pushViewController:itemVC animated:YES]; Inside the UITabBarController I add an UITableViewController: ISSTableViewController *graphics = (ISSTableViewController *)[tabBarController.viewControllers objectAtIndex:3]; Inside the didSelectRowAtIndexPath I present a Modal View Controller using a UINavigationController: GraficoViewController *graph = [[GraficoViewController alloc] initWithNibName:@"GraficoViewController" bundle:nil]; UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:graph]; [self presentModalViewController:navigationController animated:YES]; [navigationController release]; Now the (BIG) question is: I have to hide the NagivationBar of my first UITableViewController inside my last view. I tried with this: [[[[[self parentViewController] parentViewController] parentViewController] navigationController] setNavigationBarHidden:YES]; but it doesn't work. Can someone tell me how I can find my ancestor View??? Thanks.

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  • Maven problems using GAE and DataNucleus

    - by Wraith
    I'm having trouble retrieving 2 artifacts in my Maven/Java/Google App Engine project: com.google.appengine.orm:datanucleus-appengine:jar:1.0.7.final com.google.appengine:appengine-api-1.0-sdk:jar:1.3.4 There's a similar question posted, but each answer brings me back to the same error message. More detail I don't know if it is relevant, but rather than a version number, my original dependency for DataNucleus contained a variable. I am using Eclipse. <groupId>org.datanucleus</groupId> <artifactId>datanucleus-core</artifactId> <version>${datanucleus.version}</version> <scope>runtime</scope> I did not include my stack trace in Maven for brevity's sake. Please let me know if it would help to post it. Thank you.

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