Duplicate key or integrity constraint violation

[Petar]

Hi all,
I use MySQL with Hibernate and JADE and when i treid to
start the project I got the following trace:

[java] (Agent2.Agent2 92 ) Contacting server... Please wait!
[java] (Agent.Agent 38 ) Committing DataStack in Agent
[java] (Agent.Agent 49 )
[java] (Agent.Agent 49 )
[java] (Agent.Agent 49 )
[java] (util.JDBCExceptionReporter 57 ) SQL Error: 1216, SQLState: 23000
[java] (util.JDBCExceptionReporter 58 ) Duplicate key or integrity constraint violation message from server: "Cannot add or update a child row: a foreign key constraint fails"
[java] (util.JDBCExceptionReporter 57 ) SQL Error: 1216, SQLState: 23000
[java] (util.JDBCExceptionReporter 58 ) Duplicate key or integrity constraint violation message from server: "Cannot add or update a child row: a foreign key constraint fails"
[java] (impl.SessionImpl 2399) Could not synchronize database state with session
[java] net.sf.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
[java] at net.sf.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:73)
[java] at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:30)
[java] at net.sf.hibernate.impl.BatcherImpl.convert(BatcherImpl.java:325)
[java] at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:134)
[java] at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2441)
[java] at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2395)
[java] at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2260)
[java] at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
[java] at org.uctm.abss.agents.Agent.BehaviourA13_HandleCommitDataStack.action(BehaviourA13_HandleCommitDataStack.java:52)
[java] at jade.core.behaviours.Behaviour.actionWrapper(Unknown Source)
[java] at jade.core.Agent.mainLoop(Unknown Source)
[java] at jade.core.Agent.run(Unknown Source)
[java] at java.lang.Thread.run(Thread.java:534)
[java] Caused by: java.sql.BatchUpdateException: Duplicate key or integrity constraint violation message from server: "Cannot add or update a child row: a foreign key constraint fails"
[java] at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1492)
[java] at com.mchange.v2.sql.filter.FilterPreparedStatement.executeBatch(FilterPreparedStatement.java:260)
[java] at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:54)
[java] at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:127)
[java] ... 9 more
Please if somebody knows how I may to avoid this problem let's show me the way!