Do you have a full stack trace? Sounds like an issue with the PostgreS driver. Are you running the latest version?
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It is a just a warning that driver you are using doesn't completely/properly implement JDBC4 functionality.
After that hibernate just fallbacks to using old way of doing things.
In any case, you should upgrade your driver or even use http://impossibl.github.io/pgjdbc-ng/
Thanks for your replies.
I am using PostgreSQL 9.3. There are three JARs in pgjdbc-ng and which jar is suitable for 9.3? Is pgjdbc-ng jar is better?
Fixed by using latest postgresql driver http://jdbc.postgresql.org/download/postgresql-9.3-1102.jdbc41.jar because it is suggested for Java 7. http://jdbc.postgresql.org/download/postgresql-9.3-1102.jdbc4.jar will also work.