A version of IBM 1.3.1 does. I assume it is used in:
http://www-3.ibm.com/software/info1/websphere/index.jsp?tab=products/studio5faq&
S_TACT=103BGW01&S_CMP=campaign
search the above webpage for "hot".
So you could DL a trial version and play with the JRE.
saket
> Any body know which JDK 1.4 VMs support Java Debug Wire Protocol and the
> ability to replace bytecodes using the Eclipse debugger?
>
> Steve Stephens