Memory leak when reading EJB 2.1 CMP EntityBeans in JBOSS7.1.1-Final

On a recent PSR testing, we saw frequent OOME on accessing the site. Later, on investigation heap dump,we found that there are large number of objects getting created for org.jboss.invocation.interceptor[] from WeavedInterceptor and ChainedInterceptor.

Below is the screen shot of it..

Later on investigation, we found its because of the bug in JBOSS7.1.1-Final, this is due migrating EJB2.1 CMP EntityBeans to this JBOSS7.1.1-Final version.

We are hitting the bug https://issues.jboss.org/browse/AS7-4675

More details on actual stack trace can be found in https://community.jboss.org/thread/198920 

The patch for this issue could be found in https://source.jboss.org/viewrep/JBossAS/cmp/src/main/java/org/jboss/as/cmp/jdbc/JDBCStoreManager.java?r1= 22dd690a56844ae54d6be29ca39014136b958566&r2=d84f915669619424fc4a4c69993fad2e128bc73b 

We need to patch JDBCStoreManager.java for this in the jboss AS 7.1.1.

How to take a thread dump

Yesterday, I was looking to find whether any daemon thread is running with in jboss server, which does an scheduled job.

Tried ps -efw but it didn't worked, as it's an internal thread, got some suggestions that dumpingthe jboss process will dump the name of daemon threaad and finally it worked great :)


# Find the running boss server process id.

ps -efww | grep 'java' #choose your jboss server pid.

# send thread dump signal.
kill -3 $pid