What about the possibility of trying out the Java 1.6 beta. The problem though is LW won't use it if there's any other Java versions installed. So you'd need to remove those 1st, then install Java 1.6; http://java.sun.com/javase/6/download.jsp JRE "Offline" version which is a 15.72 MB download. It's had good reports by members on the forum.

It's the 3rd on the list: Java Runtime Environment (JRE) 6 Beta 2
The Java SE Runtime Environment (JRE) allows end-users to run Java applications.