thrift didn't throw exception when I use a port that is already used by another process

[Jeff Zhang]

I use a already used port when constructing TServerSocket, but it didn't
throw exception. Is this a thrift known issue or I misuse the API ? Thanks

serverTransport = new TServerSocket(this.port);
server = new TThreadPoolServer(
     new TThreadPoolServer.Args(serverTransport).processor(processor));