Setting java.lang.String values with the setObject method in version 8 of the pgsql-jdbc driver (postgresql-8.0-310.jdbc3.jar) does not work as with version 7 (pg74.215.jdbc3.jar) of the driver. Example:
Create a prepared statement with sql "select localtimestamp - time ?". Call setObject(1, java.lang.String) with the String value "00:00:00" for instance. In version 7 this gets executed as "select localtimestamp - time '00:00:00'", while version 8 try to execute it as "select localtimestamp - time 00:00:00", which of cause fails since the quotes are missing.