Recently I downloaded JDBC 9.1-901 driver form
http://mvnrepository.com/artifact/postgresql/postgresql/9.1-901.jdbc4. After invoking org.postgresql.util.PSQLDriverVersion from postgresql-9.1-901.jdbc4.jar much to my suprise the application output was: PostgreSQL 9.0 JDBC4 (build 801).
After downloading jar from http://jdbc.postgresql.org/download.html with version 9.1-902 everything worked as expected.
Is there any greater good behind this version mismatch?