1 Reply Latest reply on Aug 21, 2004 11:48 AM by Shigeru Chiba

    Metaobject NullPointerException caused by final methods (and

    nathanmeyers Newbie

      Hello,

      I just got back to using Javassist after some unsuccessful earlier attempts. I was hitting a strange NullPointerException during execution of some methods in classes I had instrumented with Javassist reflection.

      The problem turned out to be some faulty logic in ClassMetaobject for determining the list of available methods; it was failing to see final methods defined by reflective superclasses - so the methods[] array had some null elements that should not have been null.

      Here's my fix, based on the Javassist 3.0beta release code:

      --- src/main/javassist/reflect/ClassMetaobject.java 1 Jul 2004 23:26:57 -0000 1.1.1.1
      +++ src/main/javassist/reflect/ClassMetaobject.java 20 Aug 2004 18:20:53 -0000
      @@ -246,7 +246,8 @@
       methods = new Method[n];
       for (int i = 0; i < n; ++i) {
       Method m = allmethods[ i];
      - if (m.getDeclaringClass() == baseclass) {
      + if (m.getDeclaringClass() == baseclass ||
      + Modifier.isFinal(m.getModifiers())) {
       String mname = m.getName();
       if (mname.startsWith(methodPrefix)) {
       int k = 0;
      


      Nathan Meyers