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  • Thread runs only once

    - by folone
    When a Thread is finished, you cannot run it once more, using start() method: it throws an Exception. Could anyone explain, why? What stands behind such an architectural decision?

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  • selecting the first of multiple classes

    - by gleddy
    Not sure if you can do this, but I want to select the first of two classes of an element with jQuery and return it's first class only. <div class="module blue"> I want to return 'module'. tried this: var state = $('body').attr('class').first(); but none of that seems to work, thanks for any advice.

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  • Why do i get a circular reference exception when calling to_json on an ActiveRecord::Relation

    - by midas06
    In Rails 3 (beta 3 on 1.8.7), when calling to_json on a relation i get a circular reference exception. Converting that relation to an array first, and THEN calling to_json works. Code That fails: Model.where().to_json (Where model is any model in your Rails 3 app) Code that works: Model.where().to_a.to_json This can be reproed on the console. Has anyone else run in to this? Is this expected?

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  • VS2010 throws exception while opening project

    - by Prashant
    When I try opening a project I get an exception saying Web application is configured to use IIS. Error : The Web Application Project EntityServices is configured to use IIS. To access local IIS Web sites, you must install the following IIS components: IIS 6 Metabase and IIS 6 Configuration Compatibility In addition, you must run Visual Studio in the context of an administrator account. NOTE - I have already installed IIS 7. My box is a x64 bit Windows 7 box.

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  • MessageBroker.getMessageBroker(null) getting null pointer Exception

    - by Shital
    I am creating Dynamic Destinations MessageBroker broker = MessageBroker.getMessageBroker(null); MessageService service = (MessageService) broker.getService("message-service"); MessageDestination destination = (MessageDestination) service.createDestination("Group1"); if (service.isStarted()) { destination.start(); } But I am getting Null Pointer Exception MessageBroker broker = MessageBroker.getMessageBroker(null); Can Anyone Help Me

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  • Silverlight DataGrid Exception Reordering Column Headers

    - by Mike
    I'm trying to set the initial display order of the column headers in a silverlight datagrid by changing the column header DisplayIndex values. If I try to set the column order at page load time, I get an out of range exception. If I set the column order (same routine) at a later time like, in a button click handler, it works. Is this just a bug in the silverlight datagrid control? Suggestions for a possible work around?

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  • Where do I handle asynchronous exceptions?

    - by Jurily
    Consider the following code: class Foo { // boring parts omitted private TcpClient socket; public void Connect(){ socket.BeginConnect(Host, Port, new AsyncCallback(cbConnect), quux); } private void cbConnect(IAsyncResult result){ // blah } } If socket throws an exception after BeginConnect returns and before cbConnect gets called, where does it pop up? Is it even allowed to throw in the background?

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  • converting string to valid datetime

    - by Ranjana
    strdate=15/06/2010 DateTime dt = DateTime.Parse(strdate, System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat); i cannot able to get the datetime value as dd/mm/yyyy. it is giving exception 'string is not recognized as a valid datetime' oly if it is in 06/15/2010 it is working. how to get the same format in dt.

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  • `return value' from Constructor Exception in Java?

    - by Lajos Nagy
    Take a look that the following code snippet: A a = null try { a = new A(); } finally { a.foo(); // What happens at this point? } Suppose A's constructor throws a runtime exception. At the marked line, am I always guaranteed to get a NullPointerException, or foo() will get invoked on a half constructed instance?

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  • Last chance to see ... Virtualisation for Developers at NxtGenUG Cambridge, Tuesday 14th December

    - by Liam Westley
    As a farewell to 2010 I'm also saying farewell to presenting my Virtualisation for Developers and Hyper-V for Developers presentations with a final outing at NxtGenUG in Cambridge (my first visit to a user group in The Fens). I may have some homemade nibbles and party stuff to liven up the evening, and a certain Rachel Hawley has suggested a santa hat might be appropriate too. It's going to be a fun night. Sign up details are available here,   http://www.nxtgenug.net/ViewEvent.aspx?EventID=353 And for those of you who can't make this last outing, I am planning on converting both presentations into a series of blog posts so the content will be available to a wider audience.  If the posts don't seem to be appearing fast enough drop me an e-mail to remind me to get on with it !

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  • Why first arg to execve() must be path to executable

    - by EBM
    I understand that execve() and family require the first argument of its argument array to be the same as the executable that is also pointed to by its first argument. That is, in this: execve(prog, args, env); args[0] will usually be the same as prog. But I can't seem to find information as to why this is. I also understand that executables (er, at least shell scripts) always have their calling path as the first argument when running, but I would think that the shell would do the work to put it there, and execve() would just call the executable using the path given in its first argument ("prog" from above), then passing the argument array ("args" from above) as one would on the command line.... i.e., I don't call scripts on the command line with a duplicate executable path in the args list.... /bin/ls /bin/ls /home/john Can someone explain?

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  • Bad_alloc exception when using new for a struct c++

    - by bsg
    Hi, I am writing a query processor which allocates large amounts of memory and tries to find matching documents. Whenever I find a match, I create a structure to hold two variables describing the document and add it to a priority queue. Since there is no way of knowing how many times I will do this, I tried creating my structs dynamically using new. When I pop a struct off the priority queue, the queue (STL priority queue implementation) is supposed to call the object's destructor. My struct code has no destructor, so I assume a default destructor is called in that case. However, the very first time that I try to create a DOC struct, I get the following error: Unhandled exception at 0x7c812afb in QueryProcessor.exe: Microsoft C++ exception: std::bad_alloc at memory location 0x0012f5dc.. I don't understand what's happening - have I used up so much memory that the heap is full? It doesn't seem likely. And it's not as if I've even used that pointer before. So: first of all, what am I doing that's causing the error, and secondly, will the following code work more than once? Do I need to have a separate pointer for each struct created, or can I re-use the same temporary pointer and assume that the queue will keep a pointer to each struct? Here is my code: struct DOC{ int docid; double rank; public: DOC() { docid = 0; rank = 0.0; } DOC(int num, double ranking) { docid = num; rank = ranking; } bool operator>( const DOC & d ) const { return rank > d.rank; } bool operator<( const DOC & d ) const { return rank < d.rank; } }; //a lot of processing goes on here; when a matching document is found, I do this: rank = calculateRanking(table, num); //if the heap is not full, create a DOC struct with the docid and rank and add it to the heap if(q.size() < 20) { doc = new DOC(num, rank); q.push(*doc); doc = NULL; } //if the heap is full, but the new rank is greater than the //smallest element in the min heap, remove the current smallest element //and add the new one to the heap else if(rank > q.top().rank) { q.pop(); cout << "pushing doc on to queue" << endl; doc = new DOC(num, rank); q.push(*doc); } Thank you very much, bsg.

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  • Exception throwing

    - by Ben Aston
    In C#, will the folloing code throw e containing the additional information up the call stack? ... catch(Exception e) { e.Data.Add("Additional information","blah blah"); throw; }

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  • Regular expression to retrieve everything before first slash

    - by alex
    I need a regular expression to basically get the first part of a string, before the first slash (). For example in the following: C:\MyFolder\MyFile.zip The part I need is "C:" Another example: somebucketname\MyFolder\MyFile.zip I would need "somebucketname" I also need a regular expression to retrieve the "right hand" part of it, so everything after the first slash (excluding the slash.) For example somebucketname\MyFolder\MyFile.zip would return MyFolder\MyFile.zip.

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  • How to select and hide all but first 5 elements in a HTML file (DOM)

    - by Zhen
    I am attempting to use coffeescript/jQuery to do the following: 1) Retrieve all the 'topics' displayed in the html (seen below) 2) Hide all the topics from display except for the first 5 listed. I tried to do the following but is not working //Retrieve the entire list of and hide all but the first 5 topics in the list $(".topics .topic")[5..-1].hide() Can someone advise me on how I can correctly retrieve the list of topics from the HTML document and subsequently hide ALL but the first 5 topics?

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  • Javascript permission denied. Not cross domain?

    - by Dan
    I'm working on a web app that very rarely returns a Javacript permission denied error when attempting to access document elements. I'm well aware of cross-domain issues and I am actively pursuing them as a possible cause. My question is: are there other possible causes for a permission denied exception? Just want to make sure I'm looking in to all possible avenues. Thanks!

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  • FileSystemWatcher and System Out of Memory Exception

    - by Saurabh
    A little context There is a wpf based application which i left opened for 2-3 days without performing any activity throws out of memory exception , this is very Weird situation and does not happen all of the time. During this ideal activity , my application does nt perform any activity but just a file system watcher contineously watching a shared location , so i thought that would be a problem but i am not sure. Any suggestion is always welcomed.

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  • Spring 3 MVC - Form Failure Causes Exception When Reloading JSP

    - by jboyd
    Using Spring 3 MVC, please bear with the long code example, it's quite simple, but I want to make sure all relevant information is posted. Basically here is the use case: There is a registration page, a user can login, OR fill out a registration form. The login form is a simple HTML form, the registration form is a more complicated, Spring bound form that uses a RegistrationFormData bean. Here is the relevant code: UserController.java ... @RequestMapping(value = "/login", method = RequestMethod.GET) public String login(Model model) { model.addAttribute("registrationInfo", new ProfileAdminFormData()); return "login"; } ... @RequestMapping(value = "/login.do", method = RequestMethod.POST) public String doLogin( @RequestParam(value = "userName") String userName, @RequestParam(value = "password") String password, Model model) { logger.info("login.do : userName=" + userName + ", password=" + password); try { getUser().login(userName, password); } catch (UserNotFoundException ex) { logger.error(ex); model.addAttribute("loginError", ex.getWebViewableErrorMessage()); return "login"; } return "redirect:/"; } ... @RequestMapping(value = "/register.do") public String register( @ModelAttribute(value = "registrationInfo") ProfileAdminFormData profileAdminFormData, BindingResult result, Model model) { //todo: redirect if (new RegistrationValidator(profileAdminFormData, result).validate()) { try { User().register(profileAdminFormData); return "index"; } catch (UserException ex) { logger.error(ex); model.addAttribute("registrationErrorMessage", ex.getWebViewableErrorMessage()); return "login"; } } return "login"; } and the JSP: ... <form:form commandName="registrationInfo" action="register.do"> ... So the problem here is that when login fails I get an exception because there is no bean "registrationInfo" in the model attributes. What I need is that regardless of the path through this controller that the "registrationInfo" bean is not null, that way if login fails, as opposed to registration, that bean is still in the model. As you can see I create the registrationInfo object explicitly in my controller in the method bound to "/login", which is what I thought was going to be kind of a setup method" Something doesn't feel right about the "/login" method which sets up the page, but I needed to that in order to get the page to render at all without throwing an exception because there is no "registrationInfo" model attribute, as needed by the form in the JSP

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  • Python RegExp exception

    - by Jasie
    How do I split on all nonalphanumeric characters, EXCEPT the apostrophe? re.split('\W+',text) works, but will also split on apostrophes. How do I add an exception to this rule? Thanks!

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