The Aster legacy JDBC driver (pre-5.0.3) supports thread safety for all JDBC objects. The new Aster JDBC Driver (5.0.3 and later), does not support JDBC object thread safety in all cases. If you have developed code based on the legacy JDBC driver that uses the same instance of a JDBC object across multiple threads simultaneously, you may have to modify your code to ensure that JDBC object thread safety is implemented by your application.