JDBC connector 1.5.6+: preparedStatement + getGeneratedKeys() = faulty exception on _first_ resultset.next()

{{ connection = dataSource.getConnection();
statement = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
<... >
result = statement.executeUpdate();

ResultSet rs = statement.getGeneratedKeys();
}}

rs.next() now throws java.sql.SQLException: Operation not permit on a closed resultSet.

This should not happen on first call to rs.next().

Bug introduced in 1.5.7, 1.5.6 behaves as it should with regards to this.