如何在停止tomcat服务器时检查线程是否被终止或继续运行？

Question

I have a thread pool of 10 threads to serve some task and they are keep running in my web application in tomcat server. I am using the ExecutorService to create Thread Pool as given below.

ExecutorService executor = Executors.newFixedThreadPool(10);

Will these thread be killed or keep running after stopping the tomcat server without executing executor.shutdown()?

Thanks.

Answer 1

As others have mentioned if you execute tomcat shutdown, it's going to terminate your thread.

However, as per your comment you are trying to gracefully kill your threads. So I think you need to implement your shutdown logic in the ServletContextListener and use the contextDestroyed method.

Answer 2

When the Tomcat shuts down, all remaining threads will be terminated as well. Your threadpool might stop tomcat from shutting down gracefully. Eventually, the process might be killed by the script that runs your Tomcat (so, it depends on how you initiate/shutdown your Tomcat).

Answer 3

Creating threads inside a web container not always recommended because they do not let container shuts down gracefully. You should use managed thread pool, they will also be useful if you want to access other container's managed resources for example EJB's.

Explanation here