"No results" exception on insert

Hello,

I have some code which is essentially doing the following:

Statement stmt;
ResultSet rs = stmt.executeQuery("insert into users values ( 'joe', 'blow'
)");

The values are inserted into the table correctly. I verified this using
psql:
"select * from users".

The problem is that the executeQuery throws an Exception. The message
is "No results were returned by the query":

No results were returned by the query.
at org.postgresql.jdbc2.Statement.executeQuery(Statement.java,
Compiled
Code)

My driver is "org.postgresql.Driver" from the jar file jdbc7.0-1.2.jar. I
think
the port version is 7.1 The platform is FreeBSD 4.2-RELEASE.
I am using linux jdk 1.2.2.

Can anyone give me any ideas?

Thanks,
Brian