get unknown func "set-extend-priority" when trying to set breakpoint

[Chuck Irvine]

I thought I would try to use the new debugger, but got almost nowhere. Following the instructions in the readme, I brought up a java file and invoked the menu command “JDEbug->Set Breakpoint” and immediately got an elisp error complaining that the symbol set-extend-priority has no function definition. The function is called in jde-bug-highlight-breakpoint. I’m using Xemacs 21.2.26 under windows.