| narrowing problem in my plugin using jmx [message #45831] |
Tue, 19 October 2004 10:19  |
Eclipse User |
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Originally posted by: buhla2.hta-bi.bfh.ch
hello!
i have a problem in my plugin when i try to narrow (using the
PortableRemoteObject.narrow() method) an object to a
javax.management.j2ee.ManagementHome instance.
InitialContext context = new InitialContext(props);
Object object = context.lookup(props.getProperty(JSR77Connector.CONTEXT));
Class homeClass =
Thread.currentThread().getContextClassLoader().loadClass(MAN AGEMENT_HOME);
Object o = PortableRemoteObject.narrow (object, homeClass);
ManagementHome home = (ManagementHome) o;
loading the ManagementHome class works without any problem, but the narrow()
method rises a ClassCastException.
the same code works fine as a non plugin standalone java programm.
the bundle manifest file looks like that:
Bundle-Activator: ch.bfh.jmxconsole.connectors.jsr77.internal.ConnectionImpl
Bundle-ClassPath: /ConnectionImpl.jar, /jbossall-client.jar
Import-Package: ch.bfh.jmxconsole.core.connection,
ch.bfh.jmxconsole.connectors.jsr77, org.osgi.framework
Export-Package: ch.bfh.jmxconsole.connectors.jsr77.internal
the classpath should be ok because the class can be found and loaded from
the library jar.
does someone have any ideas?
thanx alex
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| Re: narrowing problem in my plugin using jmx [message #45885 is a reply to message #45864] |
Thu, 21 October 2004 00:44  |
| Eclipse User |
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Originally posted by: buhla2.hta-bi.bfh.ch
thanks for your help jeff... actually the contextclassloader was wrong...
before using my own custom urlclassloader i tryied to instantiate some
objects without setting the current thread's contextclassloader because i
assumed it was set to the bundle's own classloader... this led to
problems... later i found that when the current thread's classloader is not
explicitly set, then it was null. so i used my own custom url classloader to
handle that... without any success.
to fix the problem i just have to set the current thread's
contextclassloader to the bundle's own classloader and now the following
works:
Thread.currentThread().setContextClassLoader(this.getClass() .getClassLoader());
InitialContext ic = new InitialContext(props); Object ref =
ic.lookup(props.getProperty(JSR77Connector.CONTEXT));
Class mgmtHomeClass = bundleContext.getBundle().loadClass(MANAGEMENT_HOME);
ManagementHome mgmtHome = (ManagementHome)PortableRemoteObject.narrow(ref,
mgmtHomeClass);
alex
"Jeff McAffer" <jeff_mcaffer@REMOVE.ca.ibm.com> schrieb im Newsbeitrag
news:cl3jtu$5ec$1@eclipse.org...
>I would start by trying to find if there is someone else who can supply the
>class you are trying to narrow to. I suspect that the context classloader
>is finding a different one than you expect.
>
> BTW, who is setting up the context classloader? What are you expecting it
> to be?
>
> Jeff
>
> "Alex B
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