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From ssme <sarmistha1...@yahoo.com>
Subject Change super class of a class
Date Wed, 18 Oct 2006 13:06:55 GMT

I am trying to change super class of an existing class. I have 2 classes . I
want to extend one from other and write back the class file. I do it by
following way.

out.println("Extension updating class file: InputFile "+inputFile+"
extending from "+ExtendFile);
			
			JavaClass oldClass = Repository.lookupClass(inputFile);
			
			JavaClass newSuper = Repository.lookupClass(ExtendFile);

			JavaClass[] interfaces = oldClass.getAllInterfaces();
			boolean alreadyExtended = false;		    
			for (int i=0; i<interfaces.length; i++)
			{
				JavaClass itf = interfaces[i];
				String itfName = itf.getClassName();
				
				if (itfName.equals(ExtendFile))
					alreadyExtended = true;
			}
		    
			if (!alreadyExtended)
			{
				ClassGen cg = new ClassGen( oldClass );
				if(!oldClass.isInterface())
					cg.setSuperclassName(newSuper.getClassName());
				else
					cg.addInterface(newSuper.getClassName());
				cg.update();
				String className = oldClass.getClassName();
				String path = Repository.lookupClassFile(className).getPath();
				
				File f = new File(path);
				cg.getJavaClass().dump(f);
				
				out.println("Extension update: successful");
			} else
			{
				out.println("Extension update: ignore, already extended from this
class/interface");
			}

But i get error when i load the class.
Call to wrong initialization method
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:141)

Both of my class has constructor which takes one parameter and call super
constructor. Looks like it changes the super class name , but the doesn't
change the reference of the super. For example if B extends A and C extends
A, i want to make C extends B. But after applying BCEL, C constructor which
has a super call still refer to A , not B.

Please help. I don't know if i miss something. 

Thanks.
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