[Roger]

Q: When I tried to start my chat, I get the error: Start chat server failed: java.lang.Exception: group is null, why?

A: This error has several reason, I'll give you the solution below:

1. The permission reason
In most Linux Server, if your account has no enough permission, you may met the error. You need contact with Server Administrator.

2. No enough resources.
You can check if your server has enough RAM, mostly, when the server has little RAM, you also met the error.

3. Another Java Process is started.
You can use the command: "PS -ef | grep Java" to check if your server has already had a java process, if so, you need kill it first, then start your chat.

Key Words: java.lang.Exception, Group is null, permisson deny, RAM