I am using the postgresql driver 8.3-604-jdbc3, and noticed something strange in my profiling reports:
In Line 2518 of AbstractJdbc2ResultSet, in function findColumnIndex, there is a call to "new Integer(n)", which takes 2% overall time in my app! It should be replaced by "Integer.valueOf(n)", because this doesn't create any new instances on Integer for the usecase found here!