[news.eclipse.platform.rcp] Re: Plug-in classpath problems with hibernat

[Raj Saini <rajbsaini@xxxxxxxxx>]

I have been playing with J2EE server and I had the simmilar class 
laoding problems. I have my J2EE/JMS API wrapped in a separate plugin 
and my application in another plugin.

I was having a ClassNotFoundException while looking up JMS connection 
and topics on JNDI.

I solved the problem my setting the context class laoder of the current 
thread to the classloader of the plugin wrapping J2EE/JMS API.

ClassLoader newloader = YourPlugin.getDefault().getClass().getClassLoader();

ClassLoader oldLoader  = Thread.getContextClassLoader();

Thread.currentThread().setContextClassLoader(newLoader);
//Do your stuff here

Thread.currentThread().setContextClassLoader(oldLoader);

It solved my problem of looking up Objects on JNDI.

Regards

Raj
Tran Khiet wrote:

> Be assured, I am in the situation as you do. The problem seems to be
> generalized on libraries using manipulating java beans at runtime: almost
> all frameworks such as hibernate or spring. The answer to your question
> seems crucial although I don't have the solution nor find any.
> Khiet.
>
> Luc Feys wrote:
>
>
> > I suddenly remembered that in hibernate one can specify the mapping 
> > files in code (using the hibernate API). So I tried that (again using 
> > ClassLoader.getResource), which worked fine. But now the problem has 
> > just shifted, because hibernate is now unable to find my persistent 
> > classes that correspond to my .hbm mapping files.
>
>
> > So I'm back to question 1: is it possible to make a required plug-in 
> > access classes and resources of the application that uses the required 
> > plug-in? I guess I could make the hibernate plug-in dependent on my rcp 
> > app (but that would create a circular reference, which is probably not 
> > allowed?). And that would also mean that I can not reuse my hibernate 
> > plug-in in other projects, so what would be the use of putting the jar's 
> > in a separate plug-in then?
>
>
> > Or am I seriously missing something over here?
>
>
> > Thanks in advance for your help.