JDBC API to send SimpleQuery ('Q')?

I have the following Java code running in tomcat 7 using
'postgresql-9.3-1101-jdbc41.jar' driver.

String str = "insert into tab1(a,b) values ('name', 'address');"
Statement stmt = conn.createStatement();
stmt.execute(str);

Considering that this is *not* a PreparedStatement, I would have expected
the driver to issue a Simple Query ('Q') instead of an ExtendedQuery ('P').
However, when I print the incoming connection at my middleware (pgpool), I
see the query being received is an ExtendedQuery ('P'). When I execute the
same query in psql, it triggers a Simple Query ('Q') as expected.

What am I missing here? Are there any other settings that I need to tweak?

Thanks