Program: 187323
Project: 187323
Buggy source:
@Override public NATFeatureRealization executeTest(){
  NATFeatureRealization result=NATFeatureRealization.DONT_CARE;
  Socket toStunServer=null;
  try {
    toStunServer=this.createConnectedSocket(this.primaryStunServerAddress);
    final Message responseTestI=this.executeTestI(toStunServer);
    if (responseTestI.hasAttribute(OtherAddress.class)) {
      try {
        final Message responseTestII=this.executeTestII(toStunServer);
        if (responseTestII.hasAttribute(XorMappedAddress.class)) {
          result=NATFeatureRealization.ENDPOINT_INDEPENDENT;
        }
      }
 catch (      final SocketTimeoutException eII) {
        try {
          final Message responseTestIII=this.executeTestIII(toStunServer);
          if (responseTestIII.hasAttribute(XorMappedAddress.class)) {
            result=NATFeatureRealization.ADDRESS_DEPENDENT;
          }
        }
 catch (        final SocketTimeoutException eIII) {
          try {
            final Message reponseIV=this.executeTestForConnectionDependent(toStunServer);
            if (reponseIV.hasAttribute(XorMappedAddress.class)) {
              result=NATFeatureRealization.ADDRESS_AND_PORT_DEPENDENT;
            }
          }
 catch (          final SocketTimeoutException eIV) {
            result=NATFeatureRealization.CONNECTION_DEPENDENT;
          }
        }
      }
    }
  }
 catch (  final Exception e) {
    this.logger.error("String_Node_Str",e);
  }
 finally {
    try {
      if (null != toStunServer && toStunServer.isConnected()) {
        toStunServer.close();
      }
    }
 catch (    IOException e) {
    }
  }
  return result;
}

Fixed version (ground truth):
@Override public NATFeatureRealization executeTest(){
  NATFeatureRealization result=NATFeatureRealization.DONT_CARE;
  Socket toStunServer=null;
  try {
    toStunServer=this.createConnectedSocket(this.primaryStunServerAddress);
    final Message responseTestI=this.executeTestI(toStunServer);
    if (responseTestI.hasAttribute(OtherAddress.class)) {
      try {
        final Message responseTestII=this.executeTestII(toStunServer);
        if (responseTestII.hasAttribute(XorMappedAddress.class)) {
          result=NATFeatureRealization.ENDPOINT_INDEPENDENT;
        }
      }
 catch (      final SocketTimeoutException eII) {
        try {
          final Message responseTestIII=this.executeTestIII(toStunServer);
          if (responseTestIII.hasAttribute(XorMappedAddress.class)) {
            result=NATFeatureRealization.ADDRESS_DEPENDENT;
          }
        }
 catch (        final SocketTimeoutException eIII) {
          try {
            final Message reponseIV=this.executeTestForConnectionDependent(toStunServer);
            if (reponseIV.hasAttribute(XorMappedAddress.class)) {
              result=NATFeatureRealization.ADDRESS_AND_PORT_DEPENDENT;
            }
          }
 catch (          final SocketTimeoutException eIV) {
            result=NATFeatureRealization.CONNECTION_DEPENDENT;
          }
        }
      }
    }
  }
 catch (  final Exception e) {
    this.logger.error("String_Node_Str",e);
  }
 finally {
    try {
      if ((null != toStunServer) && toStunServer.isConnected()) {
        toStunServer.close();
      }
    }
 catch (    IOException e) {
    }
  }
  return result;
}