Re: Classloading and ArgoUML

Hi Anders,

On Thu, 2003-07-03 at 05:02, Anders W. Tell wrote:
> Hi,
> 
> Im having some trouble using ArgoUML and MDR together, for some reason I 
> get a classcast exception when refering to generated Java API/JMI files. 
> It seems that MDR and ArgoUML is using different classloaders or Im I 
> wrong ?
> 
> Im sure that ArgoUML got its own classloader but how is this loader 
> related to the automatically generated internal implementation of the 
> metamodel used internally in MDR ?
> 
> 
> Has anyone had a similar problem and solved it ?

Martin, feel free to correct me if I'm wrong, but I think the answer to 
your problem lies in recent answer I got from Martin when I was trying
to use MDR inside of a Java Interpreter (DrJava), which has its own
ClassLoader.

On Tue, 2003-07-01 at 06:30, Martin Matula wrote:
> > Anyway, what you need to do to make this work is probably to implement 
> > org.netbeans.mdr.handlers.ClassLoaderProvider interface and set it to 
> > MDR by calling 
> > org.netbeans.mdr.handlers.BaseObjectHandler.setClassLoaderProvider 
> > before you start accessing the repository.
> > You will need to implement the ClassLoaderProvider so that it properly 
> > loads the classes using the DrJava's classloader. To see how this is 
> > done for NetBeans and DJava, see 
> > org.netbeans.mdrshell.DJava.CLProviderImpl and 
> > org.netbeans.modules.mdr.MDRManagerImpl.CLProviderImpl.

Basically, you just need to get the ClassLoader for ArgoUML and create a ClassLoaderProvider
for MDR that returns the ArgoUML classloader for the method 

- public ClassLoader getClassLoader()

and implements the method 

- public Class defineClass(String className, byte[] classFile)

In this case, I think you can do what I did, which is to simply implement defineClass as follows:

{
  return this.getClassLoader().defineClass(className, classFile, 0, classFile.length);
}

Let me know if that works for you. 

cheers,

roy