/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.system;
import java.net.MalformedURLException;
import java.rmi.server.RMIClassLoader;
import java.rmi.server.RMIClassLoaderSpi;
/**
* An implementation of RMIClassLoaderSpi to workaround the
* proxy ClassCastException problem in 1.4<p>
*
* <b>THIS IS A HACK!</b><p>
*
* Sun's implementation uses the caller classloader when
* unmarshalling proxies. This is effectively jboss.jar since
* that is where JRMPInvokerProxy lives. On a redeploy the
* new interfaces are ignored because a proxy is already cached
* against the classloader.<p>
*
* Another redeployment problem is that the getClassAnnotation(String)
* will end up using the old deployment class loader and this can result
* in NPEs do the class loader being destroyed.
*
* This class ignores Sun's guess at a suitable classloader and
* uses the thread context classloader instead.<p>
*
* It has to exist in the system classloader so I have included it
* in "system" for inclusion in run.jar<p>
*
* @author <a href="mailto:adrian.brock@happeningtimes.com">Adrian Brock</a>
* @author Scott.Stark@jboss.org
* @version $Revision: 85942 $
*/
public class JBossRMIClassLoader
extends RMIClassLoaderSpi
{
// Attributes ----------------------------------------------------
/**
* The JVM implementation (we delegate most work to it)
*/
RMIClassLoaderSpi delegate = RMIClassLoader.getDefaultProviderInstance();
// Constructors --------------------------------------------------
/**
* Required constructor
*/
public JBossRMIClassLoader()
{
}
// RMIClassLoaderSpi Implementation ------------------------------
/*
* Ignore the JVM, use the thread context classloader for proxy caching
*/
public Class<?> loadProxyClass(String codebase, String[] interfaces, ClassLoader ignored)
throws MalformedURLException, ClassNotFoundException
{
return delegate.loadProxyClass(codebase, interfaces, Thread.currentThread().getContextClassLoader());
}
/*
* Just delegate
*/
public Class<?> loadClass(String codebase, String name, ClassLoader ignored)
throws MalformedURLException, ClassNotFoundException
{
return delegate.loadClass(codebase, name, Thread.currentThread().getContextClassLoader());
}
/*
* Just delegate
*/
public ClassLoader getClassLoader(String codebase)
throws MalformedURLException
{
return delegate.getClassLoader(codebase);
}
/*
* Try to delegate an default to the java.rmi.server.codebase on any
* failure.
*/
public String getClassAnnotation(Class<?> cl)
{
String annotation = null;
try
{
annotation = delegate.getClassAnnotation(cl);
}
catch(Throwable t)
{
// Try the java.rmi.server.codebase property
annotation = System.getProperty("java.rmi.server.codebase");
}
return annotation;
}
}