After restarting the service fro tomcat manager causes following error:

Jan 18, 2014 8:17:51 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/drools-wb-6.0.1.Final-tomcat7.0] appears to have started a thread named [pool-4-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Jan 18, 2014 8:17:51 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/drools-wb-6.0.1.Final-tomcat7.0] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak.
Jan 18, 2014 8:17:51 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/drools-wb-6.0.1.Final-tomcat7.0] appears to have started a thread named [pool-7-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Jan 18, 2014 8:17:51 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/drools-wb-6.0.1.Final-tomcat7.0] 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.
Jan 18, 2014 8:17:51 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/drools-wb-6.0.1.Final-tomcat7.0] appears to have started a thread named [Thread-5] but has failed to stop it. This is very likely to create a memory leak.

Full trace: http://pastebin.com/75tAuZvu