Hi Kris,
All required jars including persistence jars as mentioned below are there in tomcat_home/lib folder and in gwt-console-server.war as well.
But still I get " Could not initialize stateful knowledge session: javax/persistence/Persistence"
Infact I don't see any exception in server log and in humantask console window.
So it's related to testDS configuration and tranaction manager config for tomcat which is causing that exception.
So where do we need to put testDS and configuration about datasource JNDI (jdbc/testDS1)and transaction manager in server.xml file of tomcat?