when i execute jbpm3 tutorial 3.2. Database example, i got an error:
couldn't signal token:token has ended.

...
//throw exception here
processInstance.signal();
// After this signal, we know the process execution should have
// arrived in the end-state.
assertTrue(processInstance.hasEnded());

my database is mysql innodb, why i've got so many strange things. who can help me please? my msn is:zhangmingg@hotmail.com. thank you very much.