You've got two problems.
1) There is a bug in Sun's jmxri.jar that means it doesn't
work properly with java 1.4, a fixed version is already
2) If you build for 1.4 there is some code in the
connector module you need to uncomment. The errors
should point you to the correct sources.
I've put up instructions on setting up JDK1.4 and JBoss 3.0 Beta (as well as Tomcat, MySQL, Eclipse, etc.). Check out at
You want to look at the section "Installing JBoss". There're specific steps for patching JBoss for JDK 1.4.
Note: The document assumes seperate Tomcat installation. Nevertheless, the tweak on JDK 1.4 should remain the same.
Hope this helps.
Thanks to everybody, you are of great help !