whenever i update in servlet ,i found Memory Leak in tomcat 6.0

Question

i am using the tomcat 6.0 for my web application. i have used following technology in my project.

quartz
jasper reports
Birt Reports
hibernate
MySQL for backhand.

now problem is that if i update something in my servlet and if my server is running it started that memory leak error. enter image description here

Faced a similar issue when added Qaurtz to my enterprise application. It seems that Quartz leaves some threads flying around. Fixed when updated to `try-with-resources` — Saif Asif, Feb 04 '14 at 10:44

score 0 · Answer 1 · edited May 23 '17 at 11:49

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You are creating a thread in your application which runs indefinitely when it is getting deployed and keeps running. May be you are starting a thread in the ContextListener ex: ServletContextListener. In your case, it may be MySql driver causes this problem. If you set the option Build Automatically in your IDE say Eclipse. Whenever you make changes in your class file, your application will be compiled, build and deployed in the server again. The other thing you should note is if you have JDBC jar in your WEB-INF/lib, then move it to the tomcat server lib and restart the server. This helps in de-registering the JDBC driver in JVM level.then, you will not be getting this message

Check out this link, this will give you more options to resolve it.

edited May 23 '17 at 11:49

Community

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answered Feb 04 '14 at 10:40

Keerthivasan

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but i have closed all the connection in that class finally blog. – Mitul Maheshwari Feb 04 '14 at 10:43
`Finally` can not be trusted as such – Saif Asif Feb 04 '14 at 10:43
finally will execute once class lifetime over..@saif Asif – Mitul Maheshwari Feb 04 '14 at 10:44
how i can recover from this problem...? – Mitul Maheshwari Feb 04 '14 at 10:45
Whiich JDK are you using ? – Saif Asif Feb 04 '14 at 10:46
i am using jdk1.6.0_29 @Saif Asif – Mitul Maheshwari Feb 04 '14 at 10:50
Did you move your jdbc jar to TOMCAT's /lib folder? – Keerthivasan Feb 04 '14 at 10:55

score 0 · Answer 2 · answered Feb 04 '14 at 11:00

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Quartz may start unmanaged threads. Check this link:

http://jira.terracotta.org/jira/browse/QTZ-194

answered Feb 04 '14 at 11:00

Andres

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but even i am remove all quartz code, it gives me same error. – Mitul Maheshwari Feb 04 '14 at 11:13

whenever i update in servlet ,i found Memory Leak in tomcat 6.0

2 Answers2