Extend EventHandler60 for your TeamForge event handler classes

All event handlers (synchronous and asynchronous) have to extend com.vasoftware.sf.events.EventHandler60.

This is how our example "Comment on associations" event handler does it:
package com.vasoftware.sf.plugin;
...
public class AsynchronousRelationshipEventListener extends EventHandler60 {
...
}

EventHandler60 can be found in the sfevents.jar file deployed somewhere on your TeamForge server (just do a find / -name “sfevents.jar” to search for it). You can download the 5.4 version (also compatible with later versions of TeamForge) from here.