Statement.setQueryTimeout() with autoCommit=false

Hi,

does setQueryTimeout work with autoCommit=false? When autoCommit is true, this code timeouts after 5 seconds (as
expected):

--
        Class.forName("org.postgresql.Driver");
        String url = "jdbc:postgresql://172.30.100.6/test";
        Properties props = new Properties();
        props.setProperty("user", "postgres");
        props.setProperty("password", "");

        Connection conn = DriverManager.getConnection(url, props);
        PreparedStatement st = conn.prepareStatement("INSERT INTO test VALUES('xxx')");
        st.setQueryTimeout(5);
        st.execute();
--

But if I set autoCommit to false, this code timeouts after 30 seconds on read timeout:

--
        Class.forName("org.postgresql.Driver");
        String url = "jdbc:postgresql://172.30.100.6/test";
        Properties props = new Properties();
        props.setProperty("user", "postgres");
        props.setProperty("password", "");

        Connection conn = DriverManager.getConnection(url, props);
        conn.setAutoCommit(false);
        PreparedStatement st = conn.prepareStatement("INSERT INTO test VALUES('xxx')");
        st.setQueryTimeout(5);
        st.execute();
        conn.commit();
--

I'm confused what's setQueryTimeout() method for, why it doesn't work with manual transactions?

Thanks,
Regards
Pavel