Tomcat服务器启动缓慢

Question

I have a situation where Tomcat is starting with my java application, but then hangs for several minutes before continuing. Startup logs do not seem to point to anything specific.

Is there a way that I could debug this?

Answer 1

I encountered once a problem where starting Tomcat on a dedicated server also took ages. My problem was that the entropy source that is used to initialize SecureRandom was short of entropy.

It's a known bug: https://wiki.apache.org/tomcat/HowTo/FasterStartUp#Entropy_Source

If this is your problem, known workarounds are:

Set the following system property: -Djava.security.egd=file:/dev/./urandom

or

Use 'new SecureRandom()' instead of 'SecureRandom.getInstance("SHA1PRNG")' (if you have this in your code [source] ).

Answer 2

Your question is very broad. We have nothing to work with here in providing an answer.

All I can give you is generic debugging advice.

• Add printouts into your web application's startup sequence. Watch them and see where it hangs.

• Try commenting out part for part of the start-up until you notice that start-up is suddenly sped up, the last bit you commented out should be the faulty one.