Program: 53952
Project: 53952
Buggy source:
@Override public byte[] modify(ClassLoader classLoader,String javassistClassName,ProtectionDomain protectedDomain,byte[] classFileBuffer){
  logger.info("String_Node_Str",javassistClassName);
  try {
    InstrumentClass standardService=byteCodeInstrumentor.getClass(javassistClassName);
    LifeCycleEventListener lifeCycleEventListener=new LifeCycleEventListener(agent);
    Interceptor standardServiceStartInterceptor=byteCodeInstrumentor.newInterceptor(classLoader,protectedDomain,"String_Node_Str",new Object[]{lifeCycleEventListener},new Class[]{LifeCycleEventListener.class});
    Interceptor standardServiceStopInterceptor=byteCodeInstrumentor.newInterceptor(classLoader,protectedDomain,"String_Node_Str",new Object[]{lifeCycleEventListener},new Class[]{LifeCycleEventListener.class});
    boolean isHooked=false;
    if (isHooked=(standardService.hasDeclaredMethod("String_Node_Str",null) && standardService.hasDeclaredMethod("String_Node_Str",null))) {
      standardService.addInterceptor("String_Node_Str",null,standardServiceStartInterceptor);
      standardService.addInterceptor("String_Node_Str",null,standardServiceStopInterceptor);
    }
 else     if (isHooked=(standardService.hasDeclaredMethod("String_Node_Str",null) && standardService.hasDeclaredMethod("String_Node_Str",null))) {
      standardService.addInterceptor("String_Node_Str",null,standardServiceStartInterceptor);
      standardService.addInterceptor("String_Node_Str",null,standardServiceStopInterceptor);
    }
    if (isHooked) {
      logger.info("String_Node_Str",javassistClassName);
    }
 else {
      logger.warn("String_Node_Str",javassistClassName);
    }
    return standardService.toBytecode();
  }
 catch (  Exception e) {
    if (logger.isWarnEnabled()) {
      logger.warn("String_Node_Str" + e.getMessage(),e);
    }
  }
  return null;
}

Fixed version (ground truth):
@Override public byte[] modify(ClassLoader classLoader,String javassistClassName,ProtectionDomain protectedDomain,byte[] classFileBuffer){
  logger.info("String_Node_Str",javassistClassName);
  try {
    InstrumentClass standardService=byteCodeInstrumentor.getClass(javassistClassName);
    LifeCycleEventListener lifeCycleEventListener=new LifeCycleEventListener(agent);
    Interceptor standardServiceStartInterceptor=byteCodeInstrumentor.newInterceptor(classLoader,protectedDomain,"String_Node_Str",new Object[]{lifeCycleEventListener},new Class[]{LifeCycleEventListener.class});
    Interceptor standardServiceStopInterceptor=byteCodeInstrumentor.newInterceptor(classLoader,protectedDomain,"String_Node_Str",new Object[]{lifeCycleEventListener},new Class[]{LifeCycleEventListener.class});
    boolean isHooked=false;
    if (standardService.hasDeclaredMethod("String_Node_Str",null) && standardService.hasDeclaredMethod("String_Node_Str",null)) {
      standardService.addInterceptor("String_Node_Str",null,standardServiceStartInterceptor);
      standardService.addInterceptor("String_Node_Str",null,standardServiceStopInterceptor);
      isHooked=true;
    }
 else     if (standardService.hasDeclaredMethod("String_Node_Str",null) && standardService.hasDeclaredMethod("String_Node_Str",null)) {
      standardService.addInterceptor("String_Node_Str",null,standardServiceStartInterceptor);
      standardService.addInterceptor("String_Node_Str",null,standardServiceStopInterceptor);
      isHooked=true;
    }
    if (isHooked) {
      logger.info("String_Node_Str",javassistClassName);
    }
 else {
      logger.warn("String_Node_Str",javassistClassName);
    }
    return standardService.toBytecode();
  }
 catch (  Exception e) {
    if (logger.isWarnEnabled()) {
      logger.warn("String_Node_Str" + e.getMessage(),e);
    }
  }
  return null;
}