Java – thread status exception

When I try to restart my thread, I receive the following error

Exception in thread "Thread-1" java.lang.IllegalThreadStateException
     at java.lang.Thread.start(UnkNown Source)
     at com.jrat.server.Server.run(Server.java:159)

This is a line:

if (!t.isAlive()) t.start();

The code can be executed multiple times in a loop (socket handler) As far as I know, this error means that it cannot start a new thread because it is already running Strangely enough, I had an isalive

Do you know why?

thank you.

Solution

No, this means that you cannot start a thread that has already been started

You cannot restart the thread. This is what you are trying to do Start with the document for start():

You should probably use executorservice instead of guessing - but you really don't know what you're going to do