Deadlock found when trying to get lock; try restarting transaction

Hello and sorry for my english level....

I have some process implemented, and I have doing some stress test of them...

When I try to access (to update, insert or delete) to the same table of my database (MYSQL) at same time, this exception is thrown:

Problem with bonita engine - Hibernate transactions - Deadlock

Hello community, firstable sorry for my english.
We have issues with our process, we have been analyzing the troubles which could be related with bonita engine and its connections and transactions with the database engine.
The exceptions from Bonita's log are:
1) Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.ow2.bonita.runtime.model.Execution#79715]