Memory leak

So I have this simple java server. Works great .. until I notice it gobbles up memory with every request. After some initial investigation, it appear as though the classes that serve as the threads I spin off to service the request are not being reclaimed. I'm having trouble determining what is going on, so I wrote a simple base case (code listed below). When I run this, and connect to the server multiple times via telnet, I never see the output from the garb2's finalize method. I'm assuming this is because the class is never marked for garbage collection. How come? I must be missing something incredibly obvious here ...

public class Garb1
{
public static void main(String[] args)
{
try
{
ServerSocket sc = new ServerSocket(9090);
sc.setSoTimeout(30000);

while(true)
{
try
{
Socket sock = sc.accept();
System.out.println("Incomming connection received");
Garb2 wt = new Garb2(sock);
wt.run();

System.out.println("Run() called, looping around");
}
catch(java.io.InterruptedIOException joi)
{
System.out.println("Interrupted exception caught");
}
}
}
catch(Exception e)
{
System.out.println("Error");
}
}
}


public class Garb2 extends Thread
{
public Garb2(Socket p_socket)
{
System.out.println("Garb2 constructing");
_buffer = new int[90000];
_socket = p_socket;
setName("Garb2");
}

public void run()
{
System.out.println("Garb2 running. Closing socket ...");
try
{
_socket.close();
}
catch(Exception e)
{
System.out.println("Error closing socket");
}
System.out.println("Garb2 exiting");
}

public void finalize () throws java.lang.Throwable
{
System.out.println("Garb2 finalize method called");
}

private Socket _socket;
int[] _buffer;
}