Program: 65399
Project: 65399
Buggy source:
public byte[] transform(ClassLoader loader,String className,Class classBeingRedefined,ProtectionDomain protectionDomain,byte[] classfileBuffer) throws IllegalClassFormatException {
  Map classDetailsMap=this.classDetailsMap;
  Session session=this.session;
  if ((classDetailsMap == null) || (session == null)) {
    return null;
  }
  try {
    ClassDetails classDetails=(ClassDetails)classDetailsMap.get(Helper.toSlashedClassName(className));
    if (classDetails != null) {
      ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
      ClassReader classReader=new ClassReader(classfileBuffer);
      ClassWriter classWriter=new ClassWriter(ClassWriter.COMPUTE_FRAMES);
      ClassWeaver classWeaver=new ClassWeaver(classWriter,classDetails);
      classReader.accept(classWeaver,0);
      if (classWeaver.alreadyWeaved) {
        ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        return null;
      }
      if (classWeaver.weaved) {
        byte[] bytes=classWriter.toByteArray();
        String outputPath=System.getProperty(SystemProperties.WEAVING_OUTPUT_PATH,"String_Node_Str");
        if (!outputPath.equals("String_Node_Str")) {
          outputFile(className,bytes,outputPath);
        }
        if (classWeaver.weavedPersistenceEntity) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedChangeTracker) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedLazy) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedFetchGroups) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        return bytes;
      }
      ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
    }
  }
 catch (  Throwable exception) {
    ((AbstractSession)session).log(SessionLog.WARNING,SessionLog.WEAVER,EXCEPTION_WHILE_WEAVING,className,exception);
    ((AbstractSession)session).logThrowable(SessionLog.FINEST,SessionLog.WEAVER,exception);
  }
  return null;
}

Fixed version (ground truth):
public byte[] transform(ClassLoader loader,String className,Class classBeingRedefined,ProtectionDomain protectionDomain,byte[] classfileBuffer) throws IllegalClassFormatException {
  Map classDetailsMap=this.classDetailsMap;
  Session session=this.session;
  if ((classDetailsMap == null) || (session == null)) {
    return null;
  }
  try {
    ClassDetails classDetails=(ClassDetails)classDetailsMap.get(Helper.toSlashedClassName(className));
    if (classDetails != null) {
      ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
      ClassReader classReader=new ClassReader(classfileBuffer);
      ClassWriter classWriter=new ComputeClassWriter(loader,ClassWriter.COMPUTE_FRAMES);
      ClassWeaver classWeaver=new ClassWeaver(classWriter,classDetails);
      classReader.accept(classWeaver,0);
      if (classWeaver.alreadyWeaved) {
        ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        return null;
      }
      if (classWeaver.weaved) {
        byte[] bytes=classWriter.toByteArray();
        String outputPath=System.getProperty(SystemProperties.WEAVING_OUTPUT_PATH,"String_Node_Str");
        if (!outputPath.equals("String_Node_Str")) {
          outputFile(className,bytes,outputPath);
        }
        if (classWeaver.weavedPersistenceEntity) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedChangeTracker) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedLazy) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        if (classWeaver.weavedFetchGroups) {
          ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        }
        ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
        return bytes;
      }
      ((AbstractSession)session).log(SessionLog.FINEST,SessionLog.WEAVER,"String_Node_Str",className);
    }
  }
 catch (  Throwable exception) {
    ((AbstractSession)session).log(SessionLog.WARNING,SessionLog.WEAVER,EXCEPTION_WHILE_WEAVING,className,exception);
    ((AbstractSession)session).logThrowable(SessionLog.FINEST,SessionLog.WEAVER,exception);
  }
  return null;
}