[jboss-user] [Javassist user questions] - Re: Altering Generics Information of Methods using Javassist

SimonRinguette do-not-reply at jboss.com
Thu Dec 20 15:19:52 EST 2007

I have done further reading on how this is implemented by the compiler and finally found out the answer I was looking for.

You can defenitely do that with javaassist. The key class is javassist.bytecode.SignatureAttribute.

>From a CtMethod, i've obtained the methodInfo I add a Signature attribute. You can do it with something like:

CtMethod method = ....
  | MethodInfo methodInfo = method.getMethodInfo();
  | SignatureAttribute signatureAttribute = new SignatureAttribute(methodInfo.getConstPool(),
  | "()Ljava/util/List<Ljava/lang/String;>;");
  | methodInfo.addAttribute(signatureAttribute);

If your more interesed in reading the signature with the generics inside, you can use the methodInfo.getAttribute(SignatureAttribute.tag).

I hope this helped.

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