在Cpanel服务器中部署多个Tomcat应用程序时出现内存泄漏问题

Question

We have tried to deploy multiple tomcat applications in Cpanel server and we are facing the memory issue quite often. When we are running a single tomcat application it works fine without any issues but when running two applications this causes the %CPU to increase above 250 and both the application becomes stuck. Can anyone please help us on this? Please see the error shown in log below.

org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.OutOfMemoryError: PermGen space

Exception in thread "http-bio-80-exec-1206" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-bio-80-exec-1195" java.lang.OutOfMemoryError: PermGen space

#

Answer 1

You will need to tweak and optimize the server for proper resource usages and as the Java apps that you are running and running out of Memory.

what server configuration do you have ? is it a VPS or a dedicated server ?

or you are using shared hosting ?

Answer 2

• Are you in production environment?
• Exception appear exactly at deployment stage or at the first usage of your app?
• Your apps are ligth (microservices) or are monolithics apps ? Xms and -Xmx arguments depend of that.

When you deploy a war file in tomcat, some section of tomcat java memory are used and is not well-managed by tomcat. A proof of that is if you deploy several times the same app without restart, an outofmemory appear in tomcat log.

If you are in production environment:

• Use one tomcat by app. So you can deploy, stop, start, restart, etc this app without risk of impact other apps. If you restart tomcat after one deploy, memory errors at deployment stage go away.

• Use tomcat-docker. With docker your could kill the entire tomcat ad start a new instance in each deploy. So your tomcat would be clean.