I solve the problem.
the problem is due to
http://bugs.mysql.com/bug.php?id=35489
In the last post, I report this exception:
INFO: Exception thrown from bean; nested exception is: java.lang.IllegalArgumentException: null source jav...
Caused by: java.lang.IllegalArgumentException: null source
at java.util.EventObject.<init>(EventObject.java:38)
at javax.sql.StatementEvent.<init>(StatementEvent.java:39)
at
com.mysql.jdbc.jdbc2.optional.JDBC4PreparedStatementWrapper.close(JDBC4PreparedStatementWr
apper.java:70)
at com.caucho.sql.UserStatement.close(UserStatement.java:127)
at com.caucho.sql.UserPreparedStatement.close(UserPreparedStatement.java:450)
at org.hibernate.jdbc.AbstractBatcher.closePreparedStatement(AbstractBatcher.java:534)
By using a nightly build of mysql connector j the problem is solved.
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