problem with connecting vb client to java server

[willsion lim]

I have some problem when writing a java server to receive data from vb client.

on the java side i use socket to listen

public class myServer extends Thread{
private Socket client;
public myServer(Socket c){
this.client=c;
}

public void run(){
String host;
String ipAddr;
try{

ipAddr = client.getInetAddress().getHostAddress();

System.out.println("connection from "+ipAddr+" ");

DataInputStream input = new DataInputStream(new BufferedInputStream(client.getInputStream()));
DataOutputStream output = new DataOutputStream(new BufferedOutputStream(client.getOutputStream()));
.............
===============================================================
on the vb side, i define tcpClient like

Dim tcpclient As New System.Net.Sockets.TcpClient();
Try
tcpclient.Connect(iAdd,iPort) <----the client send a blank message to server at here, and my server treat it as the message expected,
then the rest of the vb codes do nothing and hang there..
Dim networkStream As NetworkStream = tcpClient.GetStream();
........

i am a newbie in java network programming, so i still cannot find the error
Can anyone give me any reason about this kind of problem? thanks

[willsion lim]

i figure out the problem.

i use .available() to estimate the inputstream, some times it will return 0 depends on web condition.