[jboss-user] [Messaging, JMS & JBossMQ] - Re: No ClassLoaders found for: ClassLoading problem in JMS M

avis1977 do-not-reply at jboss.com
Thu Jul 12 10:00:53 EDT 2007

Thats correct... we are infact using the defineClass()

Is there a way still to make this class available to the RepositotyClass loader.

By the way the classLoader instance that I get at the point of time when I generate my code is an instance of the GenericClassLoader.

Are there any other alternatives cos all we have is bytes[] of the class file at the time when we load these classes in memory. 

Earlier my code called defineClass on the currentClass.class.getClassLoader()

I have changed the implementation to use the Thread.currentThread().getContextClassLoader().

No luck here... I get the NoClassLoaders found for error in the first Try Catch. 

Here is how the code looks like now

private Class createClass(ClassWriter writer, String className,
			String baseClassName) throws Exception {
		Class clazz = null;
		String qualifiedClassName = className.replaceAll("/", ".");
		try {
			clazz = Thread.currentThread().getContextClassLoader().loadClass(

		} catch (Exception e) {
			Class c = Class.forName("java.lang.ClassLoader");
			Class[] args = new Class[] { String.class, byte[].class, int.class,
					int.class };
			java.lang.reflect.Method method = c.getDeclaredMethod(
					"defineClass", args);
			Object[] params = new Object[] { qualifiedClassName,
					writer.toByteArray(), new Integer(0),
					new Integer(writer.toByteArray().length) };
			ClassLoader loader = Thread.currentThread().getContextClassLoader();
			clazz = (Class) method.invoke(loader, params);

			method = c.getDeclaredMethod("resolveClass",
					new Class[] { Class.class });
			method.invoke(loader, new Object[] { clazz });

		return clazz;

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