What could cause global Tomcat/JVM slowdown?

Question

I\'m experiencing a strange but severe problem running several (about 15) instances of a Java EE-ish web applications (Hibernate 4+Spring+Quartz+JSF+Facelets+Richfaces) on T

Answer 1

Has someone an idea where to look?

1. Issue could be out of Tomcat/JVM- do you have some batch job which kicks in and stress the shared resource(s) like a common database?

2. Take a thread dump and see what the java processes are doing when application response time explodes?

3. If you are using Linux, use a tool like strace and check what is java process doing.