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  • Can two different UDP socket in a system bind same port?

    - by swift
    I have an application which uses UDP connection, now when i try to run the app more than once its throwing me an exception java.net.BindException: Address already in use: Cannot bind but in my another app, which uses tcp connection, i can open two instance of the same app and its working fine. why this error only with UDP connection?

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  • Find out which object being added to NSMutableArray is nil

    - by Raphael Caixeta
    I started a project using ARC, and I'm inserting a few objects into an NSMutableArray. The objects have all started out as NSStrings, and when attempting to add these objects into the array, I get the following error: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[__NSArrayM insertObject:atIndex:]: object cannot be nil This array is holding several objects. Is there a quick way for me to find which of the objects I'm attempting to put into the array is nil?

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  • LINQ display row numbers

    - by timvaines
    I simply want to include a row number against the returned results of my query. I found the following post that describes what I am trying to achieve but gives me an exception http://vaultofthoughts.net/LINQRowNumberColumn.aspx "An expression tree may not contain an assignment operator" In MS SQL I would just use the ROWNUMBER() function, I'm simply looking for the equivalent in LINQ.

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  • Multi-Dimensional Array and ArrayIndexOutOfBoundsException

    - by notset
    Hello, I have a strange problem which I can't fix: A field: private boolean[][][] gaps; Constructor (1st line): gaps = new boolean[NOBARRICADES][WIDTH][HEIGHT]; Constructor (2nd line): for (int i = 0; i < NOBARRICADES; i++) { JAVA throws an error for the 2nd line, saying: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException Does it have anything to do with JAVA syntax (the mistake is in these lines of code) or I should look for the problem somewhere else?

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  • Can this statement ever evaluate to FALSE?

    - by BojanG
    I stumbled upon this while doing a review and the author is not available: int n = Convert.ToInt32(text); if (((n > 0) || (n < 0)) || (n == 0)) { return 1; } The code in general looks solid and it's hard for me to believe that the only purpose of this snippet is to confuse reviewers, but I don't see a way for this condition to fail. Am I missing something?

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  • What is a .NET application domain?

    - by Luke
    In particular, what are the implications of running code in two different application domains? How is data normally passed across the application domain boundary? Is it the same as passing data across the process boundary? I'm curious to know more about this abstraction and what it is useful for. EDIT: Good existing coverage of the AppDomain class in general at http://stackoverflow.com/questions/622516/i-dont-understand-appdomains

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  • VS2005: two projects doing identical tasks but with different result

    - by Craig Johnston
    In VS2005 I have multi-project solution. Two of the projects use an external set of DLLs to create a report, using report definition data taken from an SQL Server. One of the projects creates the report just fine, but the other project results in an Exception. I have checked that the projects are referencing the same versions of the all the DLLs and they appear to be identical. What could the cause of this problem?

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  • Performance of vector::size() : is it as fast as reading a variable?

    - by zoli2k
    I have do an extensive calculation on a big vector of integers. The vector size is not changed during the calculation. The size of the vector is frequently accessed by the code. What is faster in general: using the vector::size() function or using helper constant vectorSize storing the size of the vector? I know that compilers usually able to inline the size() function when setting the proper compiler flags, however, making a function inline is something that a compiler may do but can not be forced.

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  • Created query is not supported by my DB

    - by stacker
    I created an application using seam-gen. The created operation to search the DB ends with and exception (syntax error). The query has a where clause like this: lower(barcode0_.barcode_ean) like lower((?||'%')) limit ? Does hibnerate or seam create the where clause which my DB can't understand? Or is there a workaround for SQL statement related issues in seam?

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  • Notify by email when passenger error occurs

    - by foresth
    Hello, is it possible to send notification emails when passenger error occurs? Something similar to the email sending by exception notifier when there is an error in Rails app. I wonder because now we have no way to find out if someone hits an unexpected app spawner or other error (like memory limit etc.). Thank you!

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  • Return user to original page after logging in (rails session mgmt)

    - by keruilin
    I'm looking for some general guidance as to how to return a user back to the original page they were viewing after trying to log-in. The way I have the site setup now is that if a user visits the Store page, for example, and then clicks the login button in the upper right, the user is returned to the default landing page. Any help would be greatly appreciated!

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  • Multi-key dictionaries (of another kind) in C#?

    - by Matthew Scharley
    Building on this question, is there a simple solution for having a multi-key dictionary where either key individually can be used to identify the value? ie. MultikeyDictionary<TKey1, TKey2, TValue> foo; foo.Add(key1, key2, value); myValue = foo[key1]; // value == myValue foo.Remove(key2); myValue = foo[key1]; // invalid, Exception or null returned

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  • Why thread started by ScheduledExecutorService.schedule() never quits?

    - by moonese
    If I create a scheduled task by calling ScheduledExecutorService.schedule(), it never quits after execution, is it a JDK bug, or I just miss something? note: doSomething() is empty method below. public static void doSomething() { } public static void main(String[] args) { ScheduledFuture scheduleFuture = Executors.newSingleThreadScheduledExecutor().schedule(new Callable() { public Void call() { try { doSomething(); } catch (Exception e) { e.printStackTrace(); } return null; } }, 1, TimeUnit.SECONDS); }

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  • alternative to rescue in ruby ?

    - by wefwgeweg
    it seems like i have begin rescue end statements everywhere in my code. this doesn't seem like the correct thing to do. i am learning process, can anyone suggest how can i catch any exceptions without having to place everything inside begin,rescue, end. anyway to just tell ruby to shut up and just keep going even if exception is raised ?

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