setObject(int,Object) can not convert Java String object to backend's Integer type

Hi,

According to JDBC Specification Java String object could be converted to
backend's Integer type by setObject().
But in PostgreSQL JDBC, it's not true. It seems to be a bug.

Sample:
PreparedStatement stmt = con.prepareStatement("select 1::int = ?");
stmt.setObject(1, "2");
ResultSet rs = stmt.executeQuery();//raises an error here!

*)but the following is OK
stmt.setObject(1, "2",Types.INTEGER);
stmt.setObject(1, "2",Types.OTHER);


Internally stmt.setObject(1, "2") binds "2" as varchar ,
if it binds "2" as  unspecified type,the result will be OK.



Regards,
Chen Huajun