[news.eclipse.platform.rcp] Re: Classsloading Problem

[Charle Kelly <Eclipse@xxxxxxxxxxxxxxxx>]

Hi Christian,

try the following to set the ContextClassLoader


		Thread thread = null;
		ClassLoader classLoader = null;
		try
		{
			thread = Thread.currentThread();
				////////////////////////////////////////////////////////////////
			Class clazz = Class.forName("org.ac.computegrid.TaskEntry");			
			classLoader = thread.getContextClassLoader();
			thread.setContextClassLoader(clazz.getClassLoader() );
				////////////////////////////////////////////////////////////////
				// Your code goes here
				////////////////////////////////////////////////////////////////
			TaskEntry task = (TaskEntry) javaSpace.take (taskTmpl, txn, 30000);	
		}// try
		catch (Exception e)
		{
			// your Exception handling
		}// catch (Exception e)		
		finally
		{
			thread.setContextClassLoader(classLoader);
		}// finally






Christian Hager wrote:
> Hello,
>
>
> I'm trying to built an application using RCP and JavaSpaces. Currently 
> I'm experiencing some classloading problems and was hoping someone here 
> could maybe help me solve them.
> So here is what the problem is. I have a worker which is an RCP 
> Application and which is supposed to take entries from a JavaSpace 
> process them and put the results back into the space.
> The Problem is when I try to take an Entry from the Space and want to 
> cast it I using the following code
>
> TaskEntry task = (TaskEntry) javaSpace.take (taskTmpl, txn, 30000);
>
> I get the following exception
>
> java.lang.ClassCastException: org.ac.computegrid.TaskEntry
> at org.ac.computegrid.worker.GenericWorker.loop(GenericWorker.java:123)
> at org.ac.mvc.ExtThread.run(ExtThread.java:399)
> at java.lang.Thread.run(Unknown Source)
>
> I think the JavaSpace uses an RMIClassloader and the bundle does not 
> which makes the classes different. But I have no idea what I can do 
> about that. I was hoping anyone here has any idea of what I can do to 
> make it work.
>
> Thanks in advance for any help.
>
> Christian Hager