BPMS 6 on Tomcat 7 doesn't shutdown with shutdown.sh

Issue

• I deploy business-central and dashbuilder in Tomcat (EWS 2.0.1) following the document. I can start the Tomcat with startup.sh and use business-central and dashbuilder. But when I execute shutdown.sh, the java process is still alive. catalina.out is like this:

Jun 09, 2014 11:44:46 AM org.apache.catalina.core.StandardServer await
INFO: A valid shutdown command was received via the shutdown port. Stopping the Server instance.
Jun 09, 2014 11:44:46 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-apr-8080"]
Jun 09, 2014 11:44:46 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-apr-8009"]
Jun 09, 2014 11:44:46 AM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Jun 09, 2014 11:44:47 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/business-central] appears to have started a thread named [pool-5-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Jun 09, 2014 11:44:47 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/business-central] appears to have started a thread named [pool-8-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Jun 09, 2014 11:44:47 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/business-central] appears to have started a thread named [com.google.inject.internal.util.$Finalizer] but has failed to stop it. This is very likely to create a memory leak.
Jun 09, 2014 11:44:47 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/business-central] appears to have started a thread named [Thread-7] but has failed to stop it. This is very likely to create a memory leak.
Jun 09, 2014 11:44:47 AM bitronix.tm.integration.tomcat55.BTMLifecycleListener lifecycleEvent
INFO: Shutting down Bitronix Transaction Manager
Jun 09, 2014 11:44:47 AM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["http-apr-8080"]
Jun 09, 2014 11:44:47 AM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["ajp-apr-8009"]
Jun 09, 2014 11:44:47 AM bitronix.tm.integration.tomcat55.BTMLifecycleListener lifecycleEvent
INFO: Shutting down Bitronix Transaction Manager
Jun 09, 2014 11:44:48 AM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["http-apr-8080"]
Jun 09, 2014 11:44:48 AM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["ajp-apr-8009"]