[jboss-user] [Javassist] - Generating a main method

Rafael Nagure do-not-reply at jboss.com
Sun Jun 6 20:07:16 EDT 2010


Rafael Nagure [http://community.jboss.org/people/nagure] created the discussion

"Generating a main method"

To view the discussion, visit: http://community.jboss.org/message/546375#546375

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Hi there, folks. Sorry if this is a dumb question, but I couldn't find any good explanation so far.

I have the following code, a plain and simple *HelloWorld*:

ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.makeClass("HelloWorld");
CtMethod mt = CtNewMethod.make("public static void main(String[] args) { System.out.println(\"Hello World!\"); }", cc);
cc.addMethod(mt);
cc.writeFile();


As you see, there's a main method in this new generated class. So far, so good. It works like a charm.

I'd like to create this very same method using the other way:

CtClass cc = pool.makeClass("HelloWorld");
CtMethod m = new CtMethod(CtClass.voidType, "main", new CtClass[] { } , cc);
m.setModifiers(Modifier.PUBLIC & Modifier.STATIC);
cc.addMethod(m);
m.setBody("{ System.out.println(\"Hello World!\"); }");
cc.setModifiers(cc.getModifiers() & ~Modifier.ABSTRACT);
cc.writeFile();


Unfortunately, this code fails. I couldn't figure out how I'm supposed to handle String args[] with CtClass.TYPE, as it seems there are only primitive types.

Thanks a lot!

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