Tomcat starts very slowly

Question

I have installed Headwind MDM on my server.

Everything is fine except for very slow start. Here's what I see in the Tomcat logs:

INFO: Servlet context initialized

INFO: Deployment of deployment descriptor [/etc/tomcat9/Catalina/localhost/ROOT.xml] has finished in [326,630] ms

On the client side, I see that the HTTPS port is opened, but the webpage is "loading".

Answer 1

The Tomcat server start may sometimes be delayed by initializing a secure random.

If the security of the random number generator is not critical to you, the issue can be fixed in the following way:

1. Find the java.security file. On Ubuntu, it is usually located here: /etc/java-11-openjdk/security/java.security. If you are unsure, use the locate command.

2. Edit it, find the parameter

securerandom.source=file:/dev/random

and change it to

securerandom.source=file:/dev/urandom

3. Restart Tomcat.

More details could be found here: https://stackoverflow.com/questions/28201794/slow-startup-on-tomcat-7-0-57-because-of-securerandom