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• Custom SessionListener, name is not bound in this context, javax.naming.NameNotFoundException

  - by mehmet6parmak

  Hi, I am trying to implement HttpSessionListener so that users of this listener can register implementation of ISessionEvent interface to session Events.code is below: public class MySessionListener implements HttpSessionListener{ @Resource ISessionEvent sessionEvent; public ISessionEvent getSessionEvent() { return sessionEvent; } public void setSessionEvent(ISessionEvent sessionEvent) { this.sessionEvent = sessionEvent; } @Override public void sessionCreated(HttpSessionEvent arg0) { sessionEvent.SessionCreated(arg0.getSession()); } @Override public void sessionDestroyed(HttpSessionEvent arg0) { sessionEvent.SessionDestroyed(arg0.getSession()); } } When user implement ISessionEvent and add as a bean, SessionCreated and SessionDestroyed functions of implementation will be called when these events occured. You can ask why dont you just write inside listeners methods, i dont i'm just trying. When i try the code above i got the following error message: javax.naming.NameNotFoundException: Name com.mehmet6parmak.sessionlistener.MySessionListener is not bound in this Context at org.apache.naming.NamingContext.lookup(NamingContext.java:770) at org.apache.naming.NamingContext.lookup(NamingContext.java:153) at org.apache.catalina.util.DefaultAnnotationProcessor.lookupFieldResource(DefaultAnnotationProcessor.java:278) at org.apache.catalina.util.DefaultAnnotationProcessor.processAnnotations(DefaultAnnotationProcessor.java:187) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4082) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445) at org.apache.catalina.core.StandardService.start(StandardService.java:519) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:581) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Resource annotation causes the error but i could not resolve it. Thanks All... Interface and Implementation @Resource public interface ISessionEvent { public void SessionCreated(HttpSession session); public void SessionDestroyed(HttpSession session); } @Resource public class SessionEvent implements ISessionEvent { @Override public void SessionDestroyed(HttpSession session) { System.out.println("From Session Event Callback(Destroy):" + session.getId()); } @Override public void SessionCreated(HttpSession session) { System.out.println("From Session Event Callback(Create):" + session.getId()); } } Bean Definition <context:annotation-config/> <context:component-scan base-package="com.mehmet6parmak"> </context:component-scan> <bean id="sessionEvent" autowire="byName" class="com.mehmet6parmak.sessionlistener.SessionEvent"></bean> Solution:Using the method used in link works.

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• Java: JPQL search -similar- strings

  - by bguiz

  What methods are there to get JPQL to match similar strings? By similar I mean: Contains: search string is found within the string of the matches entity Case-insensitive Small mispellings: e.g. "arow" matches "arrow" I suspect the first two will be easy, however, I would appreciate help with the last one Thank you

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• cannot assing <null> to implicit types local variable using asp.net

  - by rockers

  I have this var result = general.GetInformation(int.Parse(ID), F_account, F_Info, Types); this GetInformation is my Entity.Getinformation class.. when I am trying to assing result globly I am getting Cannot Assing to implicit typed local variable? var result = ? what should I assing in global? thanks

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• How to cache queries in EJB and return result efficient (performance POV)

  - by Maxym

  I use JBoss EJB 3.0 implementation (JBoss 4.2.3 server) At the beginning I created native query all the time using construction like Query query = entityManager.createNativeQuery("select * from _table_"); Of couse it is not that efficient, I performed some tests and found out that it really takes a lot of time... Then I found a better way to deal with it, to use annotation to define native queries: @NamedNativeQuery( name = "fetchData", value = "select * from _table_", resultClass=Entity.class ) and then just use it Query query = entityManager.createNamedQuery("fetchData"); the performance of code line above is two times better than where I started from, but still not that good as I expected... then I found that I can switch to Hibernate annotation for NamedNativeQuery (anyway, JBoss's implementation of EJB is based on Hibernate), and add one more thing: @NamedNativeQuery( name = "fetchData2", value = "select * from _table_", resultClass=Entity.class, readOnly=true) readOnly - marks whether the results are fetched in read-only mode or not. It sounds good, because at least in this case of mine I don't need to update data, I wanna just fetch it for report. When I started server to measure performance I noticed that query without readOnly=true (by default it is false) returns result with each iteration better and better, and at the same time another one (fetchData2) works like "stable" and with time difference between them is shorter and shorter, and after 5 iterations speed of both was almost the same... The questions are: 1) is there any other way to speed query using up? Seems that named queries should be prepared once, but I can't say it... In fact if to create query once and then just use it it would be better from performance point of view, but it is problematic to cache this object, because after creating query I can set parameters (when I use ":variable" in query), and it changes query object (isn't it?). well, is here any way to cache them? Or named query is the best option I can use? 2) any other approaches how to make results retrieveng faster. I mean, for instance I don't need those Entities to be attached, I won't update them, all I need is just fetch collection of data. Maybe readOnly is the only available way, so I can't speed it up, but who knows :) P.S. I don't ask about DB performance, all I need now is how not to create query all the time, so use it efficient, and to "allow" EJB to do less job with the same result concerning data returning.

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• write behind cache Ehcache new feature?

  - by cometta

  Hi, i looking for guide/document/tutorial on how to use this new feature write-behind-cache in ehcache? Is there any demo in spring+jpa+ehcache+hibernate? just to clariyfing, write-behind-cache mean each time we persist entity, it will be written into cache rather than into database correct?

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• FluentNHibernate: mapping a Version property

  - by Brian

  How do I map a Version property using conventions (e.g. IClassConvention, AutomapperConfiguration)? public abstract class Entity { ... public virtual int? Version { get; protected set; } ... } <class ...> <version name="Version" column="version" generated="never" type="Int32" unsaved-value="0" /> </class>

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• Why do programmers sometimes refer to "C++/STL" like it's a separate language?

  - by BillyONeal

  This may seem a trivial question, but it's one that's bothered me a lot lately. Why do some programmers refer to "C++/STL" like it's a different language? The STL is part of the C++ standard library -- and therefore is part of the language, "C++". It's not a separate component, and it does not live alone in the scope of things C++. Yet some continually act like it's a different language altogether. Why?

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• Print/save full webpage as PDF

  - by Oliver

  I need a method to be able to print/save the current full webpage as a PDF. I know it can be done if I download a PDF printer and print to that; but I need it to be done without the user having to do anything other than click a button in a webpage. I can't do it via PHP as the page is all client side content, so I'm guessing an ActiveX component? Any ideas would be greatly appreciated! Many thanks

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• mouse wheel operates on scrollbar

  - by basicblock

  If a SWF file or even a component within it has scrollbars, wouldn't it make sense that if the user is hovered over that area (it's in focus) and uses the mouse wheel, that this movement would automatically translate to the scrollbar moving. Any ideas how this is done, the events or classes used for this? I'm open to outside components or classes too. I haven't started yet, but I'll do an item renderer because it's easy to give it scrollbar.

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• Is there an XmlWriter that writes a colorful HTML-formatted output for displaying XML in a webpage?

  - by Vilx-

  I've got a bit of XML I want to display on my ASP.NET website as-is (for debugging purposes), and it would be nice if it was colored. This should be easy to achieve with the right kind of XmlWriter, but I don't have the time to make one myself. Is there an existing (free) component that can do this?

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• How to selectively fetch items from a certain table via JPA

  - by Samuel

  Environment: JPA 1, Hibernate 3.3.x I have an JPA entity class (User), how do I selectively fetch member variables say (first_name, last_name) instead of fetching all user attributes using the JPA api.

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• Forms Designer Error Display HTML Source

  - by Pranay Rana

  I i am unable to see the design view of a winform app Errors are: One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes. The event Click is read-only and cannot be changed. at System.ComponentModel.Design.EventBindingService.EventPropertyDescriptor.SetValue(Object component, Object value) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeAttachEventStatement(IDesignerSerializationManager manager, CodeAttachEventStatement statement) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)

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• Instanciate a class with a given id in ExtJS

  - by Miller

  Hello, I would like to know if it is possible to instanciate a class by its id . For example we have a class extending Ext.grid.GridPanel with an id property, is it possible to instanciate the class just knowing his id (which is the component id in this case) ?

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• How can I make xmlpp::DomParser less verbose on errors?

  - by Beau Simensen

  How can I make xmlpp::DomParser be less verbose on errors? Right now, if parsing fails, I get a bunch of text printed to my console and I'd just as soon have that not be visible. Entity: line 1: parser error : Opening and ending tag mismatch: feed line 1 and fed <feed><entry id='5' /></fed> I don't see a lot of options for xmlpp::DomParser but I have to believe this is something that can be disabled/tweaked.

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• App losing db connection

  - by DaveKub

  I'm having a weird issue with an old Delphi app losing it's database connection. Actually, I think it's losing something else that then makes the connection either drop or be unusable. The app is written in Delphi 6 and uses the Direct Oracle Access component (v4.0.7.1) to connect to an Oracle 9i database. The app runs as a service and periodically queries the db using a TOracleQuery object (qryAlarmList). The method that is called to do this looks like this: procedure TdmMain.RefreshAlarmList; begin try qryAlarmList.Execute; except on E: Exception do begin FStatus := ssError; EventLog.LogError(-1, 'TdmMain.RefreshAlarmList', 'Message: ' + E.Message); end; end; end; It had been running fine for years, until a couple of Perl scripts were added to this machine. These scripts run every 15 minutes and look for datafiles to import into the db, and then they do a some calculations and a bunch of reads/writes to/from the db. For some reason, when they are processing large amounts of data, and then the Delphi app tries to query the db, the Delphi app throws an exception at the "qryAlarmList.Execute" line in the above code listing. The exception is always: Access violation at address 00000000. read of address 00000000 HOW can something that the Perl scripts are doing cause this?? There are other Perl scripts on this machine that load data using the same modules and method calls and we didn't have problems. To make it even weirder, there are two other apps that will also suddenly lose their ability to talk to the database at the same time as the Perl stuff is running. Neither of those apps run on this machine, but both are Delphi 6 apps that use the same DOA component to connect to the same database. We have other apps that connect to the same db, written in Java or C# and they don't seem to have any problems. I've tried adding code before the '.Execute' method is called to: check the session's connection (session.CheckConnection(true); always comes back as 'ccOK'). see whether I can access a field of the qryAlarmList object to see if maybe it's become null; can access it fine. check the state of the qryAlarmList; always says it's qsIdle. Does anyone have any suggestions of something to try? This is driving me nuts! Dave

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• Dispose a Web Service Proxy class?

  - by Matt

  When you create and use a Web Service proxy class in the ASP.Net framework, the class ultimately inherits from Component, which implements IDisposable. I have never seen one example online where people dispose of a web proxy class, but was wondering if it really needs to be done. When I call only one method, I normally wrap it in a using statement, but if I have a need to call it several times throughout the page, I might end up using the same instance, and just wondered what the ramifications are of not disposing it.

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• Is there a way to connect to a specific APN on Windows Mobile 6?

  - by Rupert

  Hi all, on a windows mobile 6.x phone, is there a way to instruct the connection manager (or whatever other component) to establish a data-link through a particular APN? Thank you very much.

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• Nginx: check content-length before file upload takes place

  - by robw

  I'm trying to prevent users from uploading (accidentally or maliciously) very large files to my website. I have nginx max_client_body_size set to 4M, but if a file larger than this is uploaded, then it uploads the entire file before returning 413 (entity too large). I want to make nginx check the Content-Length header, so that it rejects the request before it's uploaded. Alternatively, a Rails solution would also be acceptable. Any help appreciated.

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• What is the best forum plug-in solution for the Symfony framework?

  - by Zoja

  I'm looking for a good solution to integrate a forum into a symfony application. Something like phpBB would be excellent. I've seen phpBB plugins to integrate with symfony but that's not enough for my purposes, also, mapping database tables is a lame approach in my opinion. If anybody knows a good working forum component for Symfony then I would really apreciate it. :) Thanks!

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• What is a 'better' approach to query/save from server: DTO or Wcf Data Services?

  - by bonefisher

  From my perspective, the Data Services and their query approach is useful when querying simple object graphs from your server-side domain model. But when you want to query complex dependencies I couldn't create anything good out of it. The classic DTO approach is fine-grained and can handle everything, but the downside is that you have to create Dto classes for every type of server-request which is time consuming and you have to synchronize the Dto type with your domain entity/business logic.

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• Draw Custom View on specific position of screen - Android

  - by Pria

  I have a custom component which consists of 2 text view and 4 toggle buttons. I want to draw this view at some specific position on the screen. How is that possible?

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• HTML to PostScript Conversion

  - by mnour

  I'm searching for a free component or library that could convert HTML to PostScript ( .ps file format ). I'm using .Net framework 1.1. Any one have experience with situation like this ?

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• What should be the best approach to add a help file in my web application project?

  - by ahmed

  We have a Asp.Net Vb.Net application with around 35 webforms.There are some remote users who do not have the functional idea of the webforms.So i was thinking of adding a help file in my project.Is there any special component or javascript ? will it be a good option if i go with form by form or a single help file ?

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• How to stop debugging (or detach process) without stopping the process?

  - by Valentein

  I often use VS 2008 to debug a .NET C# component of an application. Sometimes, I want to quit debugging and continue running the application. Stop Debugging kills the process I was debugging. How can I achieve my aim? This is not a web app, it's a local process that runs managed and unmanaged code. I don't see any "Detach" or "Detach All" option in the Debug menu (is it enabled in some option?).

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• Restricting access to records. Is claim-based permissions a good idea.

  - by Vitalik

  in .net Claim-based identity framework If i wanted to restrict users to do an operation (view or edit) on let's say an account, a particular account #123456.(i am talking about business entity, like a bank account.) Is it a good idea to create a claim for each account they can view or edit? Any disadvantages of having a lot of claims in a set? a system admin might have access to all accounts in the system thus creating hundreds of claims (maybe more than one for each account)

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