You are using
Java 1.1 and Microsoft JVM which are both hopelessly outdated. Java 1.2 has been released in December 1998, over 11 years ago. As for Microsoft JVM,
Wikipedia wrote:Sun Microsystems, the creator of Java, sued Microsoft in October 1997 for incompletely implementing the Java 1.1 standard. [2] In 2001, Microsoft settled the lawsuit with Sun and discontinued its Java implementation.
I doubt that anyone is using Microsoft JVM anymore; It is not included in Windows XP. According to Wikipedia it was added with SP1 but removed again a few months later.
I'd reconsider and drop both the Java 1.1 and Microsoft JVM compatibility requirements;
you should move to at least Java 1.4, preferably Java 6.