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• Integrating GWT, Spring and JPA (Eclipse-link) in Weblogic 10

  - by MVK

  Hi, My application architecture looks like this. GWT in the UI layer - Calls GWT RPC service (servlets) - Looksup Spring Beans - Calls the DAO layer which is implemented in JPA (EclipseLink). I have successfully tested the application with GWT rpc services directly calling the JPA layer. But I am having trouble integrating spring into the mix. (Primary usage of Spring is transaction management). I tried googling, but could not find any good article on the topic. (Most of the articles refers to using Spring MVC within GWT, which is not what I am looking for) Could you please point me to some article/tutorial? Thanks in advance! Manoj

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• Flex - How do I get the absolute X and Y coordinate including HTML offset?

  - by Mauricio

  Hey everyone, I am calling a JS function through the ExternalInterface using Flex which requires the absolute X and Y coordinates to create a pop-up menu. The Flex application is displayed on the center of an HTML page, therefore there is an HTML X and Y offset to consider. I have tried using the LocalToGlobal and ContentToGlobal functions, but these are just giving me the X and Y coordinates relative to the Flex application, it is not considering the HTML X and Y offset of having the Flex app in the center of the page or varying different screen resolutions. Is the best approach to retrieve the HTML X and Y offset using JavaScript? Is there a Flex function I can use that provides the absolute X and Y coordinates based on the HTML page? Thanks!

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• "Socket operation on non-socket" error due to strange syntax

  - by Robert S. Barnes

  I ran across the error Socket operation on non-socket in some of my networking code when calling connect and spent a lot of time trying to figure out what was causing it. I finally figured out that the following line of code was causing the problem: if ((sockfd = socket( ai->ai_family, ai->ai_socktype, ai->ai_protocol) < 0)) { See the problem? Here's what the line should look like: if ((sockfd = socket( ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0) { What I don't understand is why the first, incorrect line doesn't produce a warning. To put it another way, shouldn't the general form: if ( foo = bar() < baz ) do_something(); look odd to the compiler, especially running with g++ -Wall -Wextra? If not, shouldn't it at least show up as "bad style" to cppcheck, which I'm also running as part of my compile?

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• Wicket : Can a Panel or Component react on a form submit without any boilerplate code?

  - by MRalwasser

  I am currently evaluating Wicket and I am trying to figure out how things work. I have a question regarding form submit and panels (or other components). Imagine a custom wicket panel which contains a text field, doing as-you-type validation using ajax. This panel is added to a form. How can the Panel react a form submit (let's say because javascript/ajax is unavailable)? I am currently only aware of one solution: calling a panel's method inside the Form onSubmit() method. But this seems not like a "reusable" approach here, because I have to add boilerplate code to every form's onSubmit() which contains the panel (and every developer which use the panel must know this). So here comes my question: Is there any way that a Panel/Component can "detect" a form submit in some way? Or is there any other solution beside this? Thank you.

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• Good programming style when handling multiple objects

  - by Glitch

  I've been programming a software version of a board game. Thus far I have written the classes which will correspond to physical objects on the game board. I'm well into writing the program logic, however I've found that many of the logic classes require access to the same objects. At first I was passing the appropriate objects to methods as they were called, but this was getting very tedious, particularly when the methods required many objects to perform their tasks. To solve this, I created a class which initialises and stores all the objects I need. This allows me to access an object from any class by calling Assets.dice(), for example. But now that I've thought about it, this doesn't seem right. This is why I'm here, I fear that I've created some sort of god class. Is this fear unfounded, or have I created a recipe for disaster?

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• In Ruby, can the coerce() method know what operator it is that requires the help to coerce?

  - by Jian Lin

  In Ruby, it seems that a lot of coerce() help can be done by def coerce(something) [self, something] end that's is, when 3 + rational is needed, Fixnum 3 doesn't know how to handle adding a Rational, so it asks Rational#coerce for help by calling rational.coerce(3), and this coerce instance method will tell the caller: # I know how to handle rational + something, so I will return you the following: [self, something] # so that now you can invoke + on me, and I will deal with Fixnum to get an answer So what if most operators can use this method, but not when it is (a - b) != (b - a) situation? Can coerce() know which operator it is, and just handle those special cases, while just using the simple [self, something] to handle all the other cases where (a op b) == (b op a) ? (op is the operator).

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• get a function of external file

  - by user295189

  I am using jQuery and my js file thats calling a jquery function resides in totally different directory than jQuery is in. I need to call this function reloadPage like this from js file reloadPage({param1:'First Parameter', param2:ID}); but it gives me an error Line: 341 Error: Object doesn't support this property or method Line 341 is reloadPage({param1:'First Parameter', param2:ID});. What can I do to run this function from outside the directory? I tried parent.reloadPage({param1:'First Parameter', param2:ID}); But that didnt work either.

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• Who should call viewDidLoad on progammatically loaded views?

  - by Remus Rusanu

  When I need to load a view programatically I do the following: MyController* myController = [[MyController alloc] init]; [[NSBundle mainBundle] loadNibNamed:@"myNib" owner:myController options:nil]; // use my controller here, eg. push it in the nav controller This works fine, but my controller's viewDidLoad is never called. So I resorted to manually calling it after the loadNibNamed call, but it doesn't seem correct. I was expecting the framework to call the viewDidLoad on my behalf. Is this the right way or I'm missing something?

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• Handling PHP exceptions with JQuery

  - by Itamar Bar-Lev

  Hello, I'm using JQuery to call a PHP function that returns a JSON string upon success or throws some exceptions. Currently I'm calling jQuery.parseJSON() on the response and if it fails I assume the response contains an exception string. $.ajax({ type: "POST", url: "something.php", success: function(response){ try { var json = jQuery.parseJSON(response); } catch (e) { alert(response); return -1; } // ... do stuff with json } Can anyone suggest a more elegant way to catch the exception? Many thanks, Itamar

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• Accomplishing boost::shared_from_this() in constructor via boost::shared_from_raw(this)

  - by Kyle

  Googling and poking around the boost code, it appears that it's now possible to construct a shared_ptr to this in a constructor, by inheriting from enable_shared_from_raw and calling shared_from_raw(this) Is there any documentation or examples of this? I'm finding nothing with google. Why am I not finding any useful buzz on this on google? I would have thought using shared_from_this in a constructor would be a hot/desirable item. Should I be inheriting from both enable_shared_from_raw and enable_shared_from_this, and restricting my usage of enable_shared_from_raw when I have to? If so, why? Is there a performance hit with shared_from_raw?

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• prevent _doPostBack getting rendered in button markup

  - by Christo Fur

  Hi Is it possible to prevent the _doPostBack() call getting rendered on a button? I would like add some custom logic prior to calling the postback. I have added an onClick event to the button e.g. <button id="manualSubmit" runat="server" class="manual-submit" onclick="$('#jeweller-form').hide();" /> However, this just gets rendered inline before the _doPostBack() But the postback gets fired before the jQueryHide takes place I would like to call my own JS function then manually trigger the postback any ideas?

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• RenderAction in an HtmlHelperExtension Method?

  - by TimLeung

  I am trying to call the RenderAction Extension Method within my own Html Helper: System.Web.Mvc.Html.ChildActionExtensions.RenderAction(helper, "account", "login"); this is so that along with some additional logic, I would like all html helpers to use a common method name structure when calling it on the view: <%= Html.CompanyName().RenderAccount() %> but the problem I am having is that, asp.net will complain about not finding the actual route it needs to process. It does not take in the parameters of "controller" to be used as the action and "login" to be used as the action. It seems to only reference the current route. Any ideas how I can package up the RenderAction?

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• Must all Concurrent Data Store (CDB) locks be explicitly released when closing a Berkeley DB?

  - by Steve Emmerson

  I have an application that comprises multiple processes each accessing a single Berkeley DB Concurrent Data Store (CDB) database. Each process is single-threaded and does no explicit locking of the database. When each process terminates normally, it calls DB-close() and DB_ENV-close(). When all processes have terminated, there should be no locks on the database. Episodically, however, the database behaves as if some process was holding a write-lock on it even though all processes have terminated normally. Does each process need to explicitly release all locks before calling DB_ENV-close()? If so, how does the process obtain the "locker" parameter for the call to DB_ENV-loc_vec()?

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• HttpWebRequest timeout in Windows service

  - by googler1

  I am getting a timeout error while starting my Windows service. I am tring to download an XML file from a remote system which causes a timeout during the service OnStart. This is the method I am calling from OnStart: public static StreamReader GetResponseStream() { try { EventLog.WriteEntry("Epo-Service_Retriver", "Trying ...", EventLogEntryType.Information); CookieContainer CC = new CookieContainer(); HttpWebRequest request = (HttpWebRequest)WebRequest.Create( Utils.GetWeeklyPublishedURL()); request.Proxy = null; request.UseDefaultCredentials = true; request.KeepAlive = true; //THIS DOES THE TRICK request.ProtocolVersion = HttpVersion.Version10; // THIS DOES THE TRICK request.CookieContainer = CC; WebResponse response = request.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); EventLog.WriteEntry("Epo-Service_Retriver", "Connected to Internet...", EventLogEntryType.SuccessAudit); return reader; } } Is there any possibility to avoid this timeout?

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• Defining Makefiles variables from a script

  - by Freddy

  I am creating a Makefile which I want it to be a single file for different architectures, OSes, libraries, etc. To do this I have a build specific XML file which defines the different configuration options for each architecture. The config file is read by Perl (it could be any language) and the Perl output returns something like: var1 := var1_value var2 := var2_value var3 := var3_value What I am trying to do is define this variables in my Makefile. From the makefile I am calling my readconfig script and it is giving the correct output, but I have not been able to get this variables as part of my Makefile. I have tried the use of eval and value, but none of them have work (although it could be an issue of me not knowing how to use them. In overall what I am trying to do is something like: read_config: $(eval (perl '-require "readConfig.pl"')) @echo $(var1) It could be assumed I am using only GNU Make behavior. Things I could not change: Config file is on XML Using Perl as a XML parser

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• jQuery tooltips on a dynamically generated page.

  - by Kyle Sevenoaks

  Him I'm trying to add a jQuery tooltip to a dynamically generated list, the text I want to display the tooltip on is in a table, so my CSS tooltip doesn't work: CSS tooltip. I tried to add this jQuery tooltip to the page, it works on my local test page, but I think the problem has something to do with uniqur ids, and I'm not sure how to implement the bind all function explained there: "To bind all of the targets to their corresponding content, it takes only one line: $(".tooltip-target").ezpz_tooltip(); Calling ezpz_tooltip() on a class will bind the hover event to each element, and because of the naming convention it will know which content to display." Can someone help me to understand what exactly I have to do to make this work on a dynamic page? The page is Euroworker's checkout product page. (You'll have to add some items to the basket, click the home button on the left of the bnav bar and click the little white button "kjøp" then the orange button "handlevogn".) Thanks.

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• What is the best way to implement an object cache with Entity Framework?

  - by Harshal

  Say I have a table of "BlogPosts" in a database and i want to be able to cache the ones that were retrieved already in memory, for further reads, I can just use a standard hashtable type memory cache like System.Web.Caching.Cache, but if i then need to update a property on one of these blog posts e.g. blogPost.Title and update the record in DB, i cannot do this without fetching it again from database as the Entity Framework context used to fetch this record when it was loaded into my cache is already disposed? How do I write code so that I am getting an object from my cache, updating one property and just calling the SaveChanges method without incurring an extra read.

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• stylesheet_link_tag producing absolute links instead of relative

  - by mathee

  I set up facebooker to tunnel my Ruby on Rails application. The issue is that I would like to test locally. That is, I don't want to have to start a tunnel every time I want to see my changes. Right now, when I start the application using ruby script/server (not calling rake facebooker:tunnel:background_start beforehand), links created by helpers (e.g., stylesheet_link_tag, javascript_include_tag, image_tag) are prepended with my tunnlr address: http://web1.tunnlr.com:myPort/. (For example, a CSS link looks like this in the page source: http://web1.tunnlr.com:myPort//stylesheets/appName.css?1234567890.) I don't want that functionality; I can't see my CSS or JavaScript changes without having to start the tunnel first. I want the links to be relative, not absolute. So, stylesheet_link_tag should produce /stylesheets/appName.css?1234567890. Does anyone know why it's doing that in the first place and how to fix it? Thanks in advance.

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• Django database caching

  - by hekevintran

  I have a Django form that uses an integer field to lookup a model object by its primary key. The form has a save() method that uses the model object referred to by the integer field. The model's manager's get() method is called twice, once in the clean method and once in the save() method: class MyForm(forms.Form): id_a = fields.IntegerField() def clean_id_a(user_id): id_a = self.cleaned_data['id_a'] try: # here is the first call to get MyModel.objects.get(id=id_a) except User.DoesNotExist: raise ValidationError('Object does not exist') def save(self): id_a = self.cleaned_data['id_a'] # here is the second call to get my_model_object = MyModel.objects.get(id=id_a) # do other stuff I wasn't sure whether this hits the database two times or one time so I returned the object itself in the clean method so that I could avoid a second get() call. Does calling get() hit the database two times? Or is the object cached in the thread? class MyForm(forms.Form): id_a = fields.IntegerField() def clean_id_a(user_id): id_a = self.cleaned_data['id_a'] try: # here is my workaround return MyModel.objects.get(id=id_a) except User.DoesNotExist: raise ValidationError('Object does not exist') def save(self): # looking up the cleaned value returns the model object my_model_object = self.cleaned_data['id_a'] # do other stuff

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• Ruby Methods: how to return an usage string when insufficient arguments are given

  - by Shyam

  Hi, After I have created a serious bunch of classes (with initialize methods), I am loading these into IRb to test each of them. I do so by creating simple instances and calling their methods to learn their behavior. However sometimes I don't remember exactly what order I was supposed to give the arguments when I call the .new method on the class. It requires me to look back at the code. However, I think it should be easy enough to return a usage message, instead of seeing: ArgumentError: wrong number of arguments (0 for 9) So I prefer to return a string with the human readable arguments, by example using "puts" or just a return of a string. Now I have seen the rescue keyword inside begin-end code, but I wonder how I could catch the ArgumentError when the initialize method is called. Thank you for your answers, feedback and comments!

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• UI not redrawing after display powered off on Win 7

  - by oltman

  Some portions of my application's interface are not getting refreshed after Windows 7 powers down the display. More specifically, I'm swapping out images, User Controls, and a button's content while the display is powered off and after it has been restarted, and this isn't being reflected in the UI until I minimize and restore the window or move it to one of the screen's edges. I've tried calling the Window's InvalidateVisual() method when the app was in a state where it needed to redraw, and that didn't solve the problem. I have only been able to reproduce this issue on Windows 7. Any ideas?

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• What are the pros and cons to keeping SQL in Stored Procs versus Code

  - by Guy

  What are the advantages/disadvantages of keeping SQL in your C# source code or in Stored Procs? I've been discussing this with a friend on an open source project that we're working on (C# ASP.NET Forum). At the moment, most of the database access is done by building the SQL inline in C# and calling to the SQL Server DB. So I'm trying to establish which, for this particular project, would be best. So far I have: Advantages for in Code: Easier to maintain - don't need to run a SQL script to update queries Easier to port to another DB - no procs to port Advantages for Stored Procs: Performance Security

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• javascript too much recursion?

  - by Ken

  Hi, I'm trying to make a script that automatically starts uploading after the data has been enter in the database(I need the autoId that the database makes to upload the file). When I run the javascript the scripts runs the php file but it fails calling the other php to upload the file. too much recursion setTimeout(testIfToegevoegd(),500); the script that gives the error send("/projects/backend/nieuwDeeltaak.php",'deeltaakNaam='+f.deeltaaknaam.value+'&beschrijving='+ f.beschrijving.value+'&startDatum='+f.startDatum.value+'&eindDatum='+f.eindDatum.value +'&deeltaakLeider='+f.leiderID.value+'&projectID='+f.projectID.value,id); function testIfToegevoegd(){ if(document.getElementById('resultaat').innerHTML == "<b>De deeltaak werd toegevoegd</b>"){ //stop met testen + upload file document.getElementById('nieuwDeeltaak').target = 'upload_target'; document.forms["nieuwDeeltaak"].submit() }else{ setTimeout(testIfToegevoegd(),500); } } testIfToegevoegd(); sorry for the dutch names we have to use them it is a school project. when I click the button that calls all this for a second time (after the error) it works fine.

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• Is ruby ||= intelligent?

  - by brad

  I have a question regarding the ||= statement in ruby and this is of particular interest to me as I'm using it to write to memcache. What I'm wondering is, does ||= check the receiver first to see if it's set before calling that setter, or is it literally an alias to x = x || y This wouldn't really matter in the case of a normal variable but using something like: CACHE[:some_key] ||= "Some String" could possibly do a memcache write which is more expensive than a simple variable set. I couldn't find anything about ||= in the ruby api oddly enough so I haven't been able to answer this myself. Of course I know that: CACHE[:some_key] = "Some String" if CACHE[:some_key].nil? would achieve this, I'm just looking for the most terse syntax.

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• NHibernate: uninitialized proxy passed to save() and cascade

  - by jonnii

  Hi, I keep getting an NHibernate.PersistentObjectException when calling session.Save() which is due to an uninitialized proxy passed to save(). If I fiddle with my cascade settings I can make it go away, but then child objects aren't being saved. The only other fix I have found is by adding the following to my DefaultSaveEventListener. protected override bool ReassociateIfUninitializedProxy(object obj, global::NHibernate.Engine.ISessionImplementor source) { if (!NHibernateUtil.IsInitialized(obj)) NHibernateUtil.Initialize(obj); return base.ReassociateIfUninitializedProxy(obj, source); } This is obviously not an ideal solution. Any ideas?

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