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  • Stateless singleton VS Static methods

    - by Sebastien Lorber
    Hey, Don't find any good answer to this simple question about helper/utils classes: Why would i create a singleton (stateless) rather than static methods? Why an object instance could be needed while the object has no state? Sometimes i really don't know what to use...

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  • Getting the right result of mouse click event

    - by Jessy
    Hello, I'm curious why I got the "right" BUT "wrong"number of result when I click the mouse. I supposed to print on the console mouseClicked once everytimes the mouse is clicked. However I got many of them printed out everytimes I clicked the mouse ...sometimes 5 e.g. mouseClicked mouseClicked mouseClicked mouseClicked mouseClicked Instead of just mouseClicked Why? public void mouseClicked(MouseEvent arg0) { System.out.println("mouseClicked"); }

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  • Eclipse autocomplete not working in some Java files

    - by m_a_khan
    Hi, I have noticed that autocomplete is not working in some of java files in Eclipse. Also, the files where autocomplete is not working, display a hollow "J" as the icon for the Java file. The files where autocomplete is working, icon for java file is a filled "J" I am wondering if someone can point out what went wrong all of suddent, why the change in icons and why autocomplete and syntax highlighting is turned-off in the files with a hollow "J" icon? Thanks.

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  • How to avoid Perm Gem space exception in JBoss server ?

    - by Purushotham
    I deploy my J2EE application after making some changes to the code. At maximum of 4 times I can deploy the EAR file into the server without restarting the JBoss server. After the 4th deployment if I deploy one more time it throws PermGem space exception. I don't what this exception is. I restart the server then everything works fine. Any idea why the Jboss server throws PermGem space exception after 4 deployments ?And Why it occurs ?

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  • struct size is different from typedef version?

    - by samoz
    I have the following struct declaration and typedef in my code: struct blockHeaderStruct { bool allocated; unsigned int length; }; typedef struct blockHeaderStruct blockHeader; When I do sizeof(blockheader), I get the value of 4 bytes back, but when I do sizeof(blockHeaderStruct), I get 8 bytes. Why is this happening? Why am I not getting 5 back instead?

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  • Logging Application Block doesn't add log entries to Event Viewer on machines other than that on whi

    - by Neo
    I am using the Logging Application Block (of Microsoft Enterprise Library 5.0) to log exceptions in the Event Viewer that occur in my WPF XBAP application. However, exceptions are only being logged if the application is run on my machine (the machine it was built on). Any other machine it doesn't log anything. I've tried to find a reason why this might be occurring - I've tried setting requirePermission to false - but to no avail. Anyone any ideas on why this might be happening?

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  • [Castle Dynamic Proxy] What really interceptors do with my c# class?

    - by Pandiya Chendur
    I was asked to implement castle dynamic proxy in my asp.net web application and i was going through couple of articles which i got from Castle Project and Code Project about castle dynamic proxy in asp.net web application.... Both articles delt with creating interceptors but i can't get the idea why interceptors are used with classes.... Why should i intercept my class which is behaving properly?

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  • ((System.Object)p == null)

    - by Daniel Bryars
    Why do this: // If parameter cannot be cast to Point return false. TwoDPoint p = obj as TwoDPoint; if ((System.Object)p == null) { return false; } Instead of this: // If parameter cannot be cast to Point return false. TwoDPoint p = obj as TwoDPoint; if (p == null) { return false; } I don't understand why you'd ever write ((System.Object)p)? Regards, Dan

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  • What is usefulness and importance of user stylesheet?

    - by metal-gear-solid
    I know the importance of Browser styles-sheet and author style-sheet. but what is the importance of user style-sheet? Why user stylesheet needed? Does every browser has user styleshhet desktop or mobile? Which type of users use user stylesheet and why? Is thery anything to do for userstyle sheet for XHTML css developer? Is userstyle sheet related to accessibility?

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  • Call overidden method in Dojo

    - by nomind
    In dojo, one cannot call a overidden superclass method outside of the same method in the derived class (for which there is this.inherited(), other than that one can call using class_name.function_name.apply). This feature is no longer there because of some refactoring and dojo guys are not going to put it back because they are not convinced about a good enough case for this. Please read this mail thread for details. Isn't there a good enough case for this functionality? Why or why not?

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  • Mercurial Branching Oddity

    - by Steve Horn
    I'm trying to understand why the below is occuring: It appears that I have started another branch, but it has no name, and I do not remember creating a new branch. Why did this new head(branch) get created? How do I keep it from happening?

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  • jquery in ajax loaded content

    - by Kim Gysen
    My application is supposed to be a single page application and I have the following code that works fine: home.php: <div id="container"> </div> accordion.php: //Click functions: load content $('#parents').click(function(){ //Load parent in container $('#container').load('http://www.blabla.com/entities/parents/parents.php'); }); parents.php: <div class="entity_wrapper"> Some divs and selectors </div> <script type="text/javascript"> $(document).ready(function(){ //Some jQuery / javascript }); </script> So the content loads fine, while the scripts dynamically loaded execute fine as well. I apply this system repetitively and it continues to work smoothly. I've seen that there are a lot of frameworks available on SPA's (such as backbone.js) but I don't understand why I need them if this works fine. From the backbone.js website: When working on a web application that involves a lot of JavaScript, one of the first things you learn is to stop tying your data to the DOM. It's all too easy to create JavaScript applications that end up as tangled piles of jQuery selectors and callbacks, all trying frantically to keep data in sync between the HTML UI, your JavaScript logic, and the database on your server. For rich client-side applications, a more structured approach is often helpful. Well, I totally don't have the feeling that I'm going through the stuff they mention. Adding the javascript per page works really well for me. They are html containers with clear scope and the javascript is just related to that part. More over, the front end doesn't do that much, most of the logic is managed based on Ajax calls to external PHP scripts. Sometimes the js can be a bit more extended for some functionalities, but all just loads as smooth in less than a second. If you think that this is bad coding, please tell me why I cannot do this and more importantly, what is the alternative I should apply. At the moment, I really don't see a reason on why I would change this approach as it just works too well. I'm kinda stuck on this question because it just worries me sick as it seems to easy to be true. Why would people go through hard times if it would be as easy as this...

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  • how to use the 'video' element on safari.

    - by zjm1126
    <video id="myVideo" src="2.mp4" controls="" tabindex="0">decoder not found</video> this code show ' decoder not found' on safari (my os is windows xp) why ? thanks and this html5 vedio can be show on firefox and chrome ,but not safari. http://shapeshed.com/examples/HTML5-video-element/ why ?

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  • What problem does NHibernate solve?

    - by SLC
    I've seen some jobs that require nhibernate knowledge, as well as numerous questions on stack. I found another question that pointed me to Summer Of NHibernate and I am watching the videos now. However it has no introduction explaining why NHibernate was created and what problem is solves. By looking on wikipedia, I can see vaguely what it does, but to me it looks like .NET already has the entity framework which seems to do the same thing. Can anyone clarify why nhibernate exists?

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  • Multiple Inheritance Debates II: according to Stroutroup

    - by asksuperuser
    I know very well about the traditional arguments about why Interface Inheritance is prefered to multiple inheritance, there has been already a post here : http://stackoverflow.com/questions/191691/should-c-include-multiple-inheritance But according to Stroutroup the real reason why Microsoft and Sun decided to get rid off multiple inheritance is that they have vested interest to do so: instead of putting features in the languages, they put in frameworks so that people then become tied to their platform instead of people having the same capability at a language standard level. What do you think ?

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  • Real life example fo Floating Point error

    - by Rob
    Is there any examples of a company that was burned by floating point data that caused a rounding issue? We're implementing a new system and all the monetary values are stored in floats. I think if i can show actual examples of why this has failed it'll have more weight than the theory of why the values can't be stored properly.

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  • Javascript date comparison

    - by Art
    Why does equality operator return false in the first case? var a = new Date(2010, 10, 10); var b = new Date(2010, 10, 10); alert(a == b); // <- returns false alert(a.getTime() == b.getTime()); // returns true Why?

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  • what is "removing backup files" installation step

    - by mfeingold
    In many windows installers the last step is called "removing backup files". I understand that to provide transactional integrity of the install process some "backup files" could've been created and have to be cleaned up. What I do not understand is why on many occasions this step takes considerably longer than the rest of the installation. Any idea why?

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