Testing the load of the socket server using Threads

[Varadharajan Srinivasan]

Hi,
I need to test the maxium load of a socket server. I follwed the following steps for that
1. Create a Socket for the server.
2. Used to threads to invoke the steps 1 for "n" threads.

In this if i have the number of theads as 50, i program runs fine. But if i am increasing the number of threads to 60 or so, i am getting a NullpointerException.

Is this problem occurrs because
1. The server i unable to open more connections or
2. There is probelm on maxium number if ports that can be open by a process
3. Memory probelm in the program

Thanks in Advance,
Varadha

[Stefan Wagner]

Test number 3. with changing -X arguments for java.
java -X
will give you a starting point (-Xms, -Xmx, ....).