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• What are the exact versions of stuff you have to install in order to be able to step-debug a Scala p

  - by Alex R

  How do YOU debug a Scala program? I mean YOU as in the person posting the Answer :) Please answer only from personal experience, not from stuff you've heard or read on the Internet. You should not believe everything you read on the Internet, especially tales of complex open-source software configurations that actually work :-) The are many Java tools which claim to support Scala in some way or another, but I have so far struck out in trying to get any one of them to actually let me set a breakpoint in Scala code and step through it. These are big, major open-source IDEs I'm talking about here. The main problem in getting a debugger to work seems to be the "version hell" with fast-changing IDEs, Plug-Ins, JDKs, and the Scala language itself. Hence, the more detailed re-statement of the question is appropriate: What is the exact version number of the IDE, Plug-In, JDK, Scala, and even Operating System, that you are successfully using? My question is related to this one, but wider in scope: http://stackoverflow.com/questions/2272705/how-to-debug-scala-code-when-outside-of-an-ide Thanks

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• My login controller doesn't work. Problem with fetching username.

  - by misterwebz

  Currently my login controller doesn't work because i can't seem to fetch the username and password. I'm currently using something like this: form_username = str(request.params.get('username')) db_user = meta.Session.query(User).filter_by(username=form_username) if db_user is None: return redirect('auth/error') No matter which username is use, db_user always returns True and thus never goes to auth/error. I used the shell to play with this and i was able establish a connection with the database, so i'm not sure what i'm doing wrong here.

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• Find changed properties of a class

  - by Rohit

  I am using asp.net 3.5 I have a license class containing 10 properties and not marked as serializable. I have to log property changes to the database. License is an entity class,and it is not in my scope to modify it. So I cannot mark it as serializabel neither i can use IpropertyChanged Interface. Now i cannot store it in viewstate as it is not serializable. I wanted to store it so that i can compare it with new values and see which value has changed. How to proceed with this.

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• Does JavaScript have an equivalent to Perl's DESTROY method?

  - by Eric Strom

  Is there any method that is called or event that is dispatched right before an Element is cleaned up by the JavaScript garbage collector? In Perl I would write: package MyObj; sub new {bless {}} sub DESTROY {print "cleaning up @_\n"} and then later: { my $obj = MyObj->new; # do something with obj } # scope ends, and assuming there are no external references to $obj, # the DESTROY method will be called before the object's memory is freed My target platform is Firefox (and I have no need to support other browsers), so if there is only a Firefox specific way of doing this, that is fine. And a little background: I am writing the Perl module XUL::Gui which serves as a bridge between Perl and Firefox, and I am currently working on plugging a few memory leaks related to DOM Elements sticking around forever, even after they are gone and no more references remain on the Perl side. So I am looking for ways to either figure out when JavaScript Elements will be destroyed, or a way to force JavaScript to cleanup an object.

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• Why can't I have static public fields in my managed beans?

  - by AlanObject

  I just started using the Netbeans 7.1 beta and it is calling out errors of a type which I have never seen before. Specifically: A managed bean with a public field should not declare any scope other than @Dependent. The fields it is complaining about are public static final. I can understand the restriction on non-static fields, but I can't think of a good reason this would not be allowed for a static field. Unfortunately I use a lot of them since I don't like having constants in my code. I note that even though I get the red dot in the margin in the editor, the maven-driven build still works and GlassFish still runs my application the way I would expect. So what is my denoument on this issue? Am I going to have to move my static fields elsewhere or is there another way of handling this?

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• Can you read pragma statements on command line startup in SQLite

  - by thermans

  I use the command line sqlite3 executable to check queries I make from my code. Is there a way to read in pragma statements or other session setup (".mode csv" for example) when the executable starts up? I know I can do a ".read " once I'm in, but that's tedious.

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• Does writing program using global variables is safer?

  - by ZoZo123

  I was reading about buffer, stack and heap overflows. I read this post as well. my question is like that: if I use only global variables in my code, can I say it prevents all the exploits of overflow? let's say I have this buffers in code declared in the global scope: char buf1[10]; char buf2[100]; If I send buf1 as the buffer to recv(int s, char *buf, int len,int flags); I will overwrite the data segment and may ruin the buf2 content, right? Would I be able to run a code from it because as I know it is not a code segment and data segment is not executable. Can we conclude that using Globals is the safest way?

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• hibernate - uniqueResult silently fails

  - by robinmag

  I have a login controller that use the hibernate uniqueResult method. Everything works fine when i test it in eclipse's tomcat server. But when i deploy my webapps to tomcat server (on the same machine) it fails: it always returns null even i use the correct credential. Here is my hibernate code: session.createCriteria(User.class) .add(Restrictions.eq(User.USERNAME_FIELD, userName)) .add(Restrictions.eq(User.PASSWORD_FIELD, password)).uniqueResult(); Thank you!

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• what factors should a fresher(for programmer job) consider and learn before saying yes to employer f

  - by Senthil

  what factors should a fresher(for programmer job) consider and learn before saying yes to employer for job offer? and to contract? and most importantly how should one get the details?how can I approach them? I know some employers dont want to give such details..right? I have shortlisted by a Software COmpany..that is parter with microsoft. and works on technology like VB ADO.DOTNET,and some other reporting stuffs.,sql servers etc.,Tell me about scope of that..because They are asking me to sign for 2 year certificate bond agreement..I want to be a great programmer and Project Leader after 5 years..advise me guys..Language/OS not problem for me,As I curious to learn more things. Most of the SO members are programmers..so yours advice is greatly appreciated

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• Extjs 3.4 - Button Icon does not show or does not center

  - by Chris

  I want to fill a button with an icon I created but whatever I have tried just seems to put the icon either half cut off and way left, or it doesn't show at all. I've been trying different combinations of CSS and the icon, iconcls, cls button options. I was following the Ext 3 buttons example page but that doesn't seem to display anything for me... This code is an item inside my form panel (I try to replicate this with different buttons in the panel) { xtype: 'container', layout: { type: 'table', columns: 2, tableAttrs: { cellspacing: 5 } }, // padding: 5, pack: 'center', align: 'middle', items: [{ xtype: 'button', width: 40, // scale: 'medium', ref: '../drawToolsBtn', tooltip: 'Drawing Tools', icon: 'img/draw.png', iconAlign: 'top', baseCls: 'x-plain', // iconCls: 'drawBtn', enableToggle: true, // padding: 3, toggleHandler: function(btn, state) { this.showDrawToolsWin(state); }, scope: this },{ xtype: 'label', // columnWidth: 1, // remainder of container padding: 3, text: 'Click button to open Drawing Tools Menu' }] } CSS -------------------- .drawBtn{ background: url(../img/draw.png) !important; } Thank you for any help!

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• what is the best way to track unique visitors?

  - by dnkira

  hello what i want is to make user counter as true as possible. exluding bots, and clever users as much as possible. as 4 what i know, it can be done in several ways: ip (trouble with dinamic ones and proxy's) cookies (with session id maybe, but can be deleted or browser can be changed) flash cookies (not all users have it) any other ways? and what is the best?

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• Is it ok to store large objects (java component for example) in an Application variable?

  - by DustMason

  I am developing an app right now which creates and stores a connection to a local XMPP server in the Application scope. The connection methods are stored in a cfc that makes sure the Application.XMPPConnection is connected and authorized each time it is used, and makes use of the connection to send live events to users. As far as I can tell, this is working fine. BUT it hasn't been tested under any kind of stress. My question is: Will this set up cause problems later on? I only ask because I can't find evidence of other people using Application variables in this way. If I weren't using railo I would be using CF's event gateway instead to accomplish the same task.

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• Best Practices for Working with Multiple Monitors in Visual Studio 2010

  - by Clever Human

  Now that Visual Studio 2010 has support for multiple monitors, I am curious how other people have their environments arranged. I have yet to come up with an arrangement that I am really satisfied with. The current best I have come up with for my 2 monitor system is to have all code windows detached. Then, on my primary monitor, I am able to have two code windows side by side (using the Windows 7 keyboard shortcuts WinKey+LeftArrow and WinKey+RightArrow.) On my secondary monitor I put the rest of the IDE with all of the tool windows that are normally on the bottom (errors list, find window, call stack, etc...) docked where the code windows normally go. I've also tried having all those things detached and having almost nothing in the IDE proper. The problems with this layout are: Newly opened code windows always open in the IDE, not on top of one of the detached windows. Detached code windows do not remember their exact placement from session to session (they are slightly off, having me to use the winkey + arrow key shortcut again and again for each window. There seems to be no way to have the code panes aware that they are on top of one another (IE -- multiple tabs.) The CTRL+TAB shortcut always displays on top of the IDE proper. The Code Panes are always "on top" of (children of) the IDE. So clicking on any code pane brings the IDE to the foreground, even when I care only about that code pane, and not the IDE. Other more minor issues... What would go a long way to making this better is having the code panes detach such that they are tab strips that can have other code panes docked within them. The new multi-monitor support in VS2010 is good, but it still seems really lacking. Can these issues be solved with an add-in? If so, is anyone aware of one? Is there a better way to work with the IDE on multiple monitors than what I am doing? NOTE: While this question is subjective (there is certainly no "this is the best way and that's final" answer) I'd really like to know possibly better methods of working with the IDE than what I have come up with. The intent is not to start a "mine's best" flame war.

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• Should I make my MutexLock volatile?

  - by sje397

  I have some code in a function that goes something like this: void foo() { { // scope the locker MutexLocker locker(&mutex); // do some stuff.. } bar(); } The function call bar() also locks the mutex. I am having an issue whereby the program crashes (for someone else, who has not as yet provided a stack trace or more details) unless the mutex lock inside bar is disabled. Is it possible that some optimization is messing around with the way I have scoped the locker instance, and if so, would making it volatile fix it? Is that a bad idea? Thanks.

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• What's the best practice for single sign on at one web server?

  - by Jade.Wang

  We have some apps written in classic ASP, ASP.NET and PHP. They are all in one same web server. We want to transfer between the apps who is currently log in or none, we do not need to transfer everything in the session object. What is the best way? We need secure and high performance. Thanks.

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• Persisting sensitve data in asp.net, odd implementation

  - by rawsonstreet

  For reasons not in scope of this question I have implemented a .net project in an iframe which runs from a classic asp page. The classic asp site persisted a few sensitive values by hitting the db on each page. I have passed there variables as xml to the aspx page, now I need to make these values available on any page of this .net site. I've looked into the cache object but we are on a web farm so I am not sure it would work. Is there a way I can can instantiate an object in a base page class and have other pages inherit from the base page to access these values? What is the best way to persist these values? A few more points to consider the site runs in https mode and I cannot use session variables, and I would like to avoid cookies if possible..

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• Logging out of Facebook invalidates offline_access token

  - by Mike Pateras

  I'm getting an offline access token like this: https://graph.facebook.com/oauth/access_token?scope=offline_access&client_id=MYCLIENTID&redirect_uri=MYREDIRECTURI&client_secret=MYSECRET&code=MYCODE obviously the MYCLIENTID and stuff have been changed for the sake of this post. Anyway, as soon as the user logs out of facebook, the key seems to no longer be valid. Am I not requesting offline_access properly (there's still an "expires" value on it, should there be if it is actually getting offline access), or is that just how it works? If it's the latter, how can I get a key that will persist, regardless of if the user logs out of facebook? I'm sure this is possible, because Tweetdeck can still write to Facebook, even though I'm currently logged out.

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• Problem While Deploying Application in GlassFish

  - by Sarang

  I have to deploy an application named "mrs-ws-server.war" in glassfish. I did it using both : 1) Package File to be uploaded to the server 2) Local package File or Directory at the address : http://localhost:42328/common/index.jsf It generates the following error : Exception while loading the app : java.lang.Exception: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection What should be the solution for the same ?

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• [C#] How to share a variable between two classes?

  - by Altefquatre

  Hello, How would you share the same object between two other objects? For instance, I'd like something in that flavor: class A { private string foo_; // It could be any other class/struct too (Vector3, Matrix...) public A (string shared) { this.foo_ = shared; } public void Bar() { this.foo_ = "changed"; } } ... // inside main string str = "test"; A a = new A(str); Console.WriteLine(str); // "test" a.Bar(); Console.WriteLine(str); // I get "test" instead of "changed"... :( I read there is some ref/out stuff, but I couldn't get what I'm asking here. I could only apply some changes in the methods scope where I was using ref/out arguments... I also read we could use pointers, but is there no other way to do it? Thanks Altefquatre

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• JSP doPost getAtribute null value

  - by newbie123

  I want to pass value to servlet but I keep get null value. <jsp:useBean id="Helper" class="model.Registration" scope="request"/> <form action="/Project/Registration" method="post" enctype="multipart/form-data"> <input type="text" size="20" name="name" value="<%=Helper.getName()%>"> <input type="submit"> </form> protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Registrationh2 = (Registration) request.getAttribute("Helper"); if(h2!=null){ System. out.println(h2.getName()); } else System. out.println("NULL"); } Is there anything wrong with my code?

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• Getting Result of $q's Resolution or Rejection

  - by Kevin Meredith

  I'm looking at a $q example from Mastering Web Application Development with Angular. For this code, how can I retrieve the String result of pizzaOrderFulfillment.resolve(...) or pizzaOrderFulfillment.reject? var myApp = angular.module('myApp',[]); myApp.controller("MyCtrl", function ($scope, $q) { var Person = function(name) { this.eat = function(food) { return name + " is eating " + food; }; this.beHungry = function(reason) { return name + " is hungry because" + reason; }; }; // success var pizzaOrderFulfillment = $q.defer(); var pizzaDelivered = pizzaOrderFulfillment.promise; var man = new Person("man"); pizzaDelivered.then(man.eat, man.beHungry); pizzaOrderFulfillment.resolve("chicken"); // TODO: var successResult = "man is eating chicken" });

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• JMS Acknowledge Asynchronous Message

  - by x1a0

  Hi, How do I acknowledge a message when I am using a message listener? I get the following error when I try to do an acknowledge in my message listener. A synchronous method call is not permitted when a session is being used asynchronously: 'acknowledge'

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• How to store and access JSON data for a site?

  - by Callmeed

  I'm buiding an HTML/jQuery site where almost all the content comes from remote JSON data. I'm having trouble coming up with a good way to store and access the data in the future (scope-wise). Currently, I've written a jQuery plugin that gets the JSONP data when the site loads. But I have other functions and jQuery plugins that need to access this data. Where should this data be stored so other functions and plugins can access it? Should it be a global variable? If it matters, this site will only run on the iPad and the back-end of the site is in Rails.

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• Which Java MVC frameworks integrate easily with StringTemplate?

  - by Daniel Jomphe

  It's hard to see how StringTemplate integrates easily (or not) with popular Java web MVC frameworks. Which Java MVC frameworks integrate easily with StringTemplate? A good answer: mentions one solution to integrate with a framework, includes a link to something useful and applicable, like: a tutorial, or documentation, or a reference to source code: free, and open source or public domain. Readers/Voters, please vote for a solution if you know it's true and great. In the scope of this question, I am not interested in any other templating engine than StringTemplate.

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• Implementing long running search in ASP.NET

  - by Gursharn Singh

  I am building a search page in asp.net 3.5. Search takes a bit of time (few seconds to few minutes). Current I use AsyncMethodCaller to call Search method. AsyncMethodCaller method stores search results in Session. I user Ajax timer to check if Search method finished and then display results. What would be the best way to implement this scenario?

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