Inserting into time stamp columns

Hi,

Consider the following simple table:

create table tstest (ts timestamp);

The following code snippet

PreparedStatement pstmt = connection.prepareStatement("insert into
tstest values(?)");
pstmt.setObject(1, "1998-06-04 00:00:00+09");
pstmt.execute();

results in the following error:

Exception in thread "main" org.postgresql.util.PSQLException: ERROR: column
"ts" is of type timestamp without time zone but expression is of type
character varying

Hint: You will need to rewrite or cast the expression.

Do I understand it correctly that it is a limitation of the JDBC
driver not to implement the String -> Timestamp implicit conversion
listed in Table 8.5 of this document:

http://docs.oracle.com/javase/1.5.0/docs/guide/jdbc/getstart/mapping.html#1034737
? Or is something missing in my code to get the friendly behavior of
plain SQL which works with time stamp strings such as '1998-06-04
00:00:00+09 without explicit conversion?

Many thanks

Peter