Can anybody tell me what causes this error:
hibernate.exception.JDBCConnectionException: could not inspect JDBC autocommit mode ?

hibernate.exception.JDBCConnectionException is implementation of JDBCException indicating problems with communicating with the database (can also include incorrect JDBC setup).

check ur JDBC setup.

if it does not solve, then use this hint

it was because a session close statement was missing from the finally block and so whenever we had an exception, the session was not closed and and became reusable for an incoming transaction. Thus this session was at times available to 2 different threads leading to above inconsistent behavior.