Tomcat shuts down automatically

Question

I\'m using Apache and Tomcat on a Windows server and since this morning, Tomcat stops working without any logs. It doesn\'t hang, it just shut down.
There\'s no log in T

Answer 1

Recently I had this problem, If somebody faces the same issue in future I hope this will help.

Scenario: Tomcat shuts down without any logs or errors

Root Cause for my problem: synchronized method accessed from a task using TimerTask

I had a singleton class with a synchronized method accessed from various threads based on timer or user action some times this method will take up to few minutes to complete. When TimerTask is waiting on this method for sometime (I guess timer is timed out /thread is killed or something is happening in the background) and the moment the lock on the method is released the tomcat is getting killed.

So I removed synchronized keyword and removed singleton and made some code changes for thread safety. Then the problem is gone.

How I found out: I had a log statement in the first line of synchronized method and everytime the tomcat shutdowns i found this message in the last few lines.

Regards, Phanindra Kasturi