I have downloaded last version of ABMaterial 3.20. B4J 5.82 jServer 2.80.
I created my first application following instruction.
After start exception is raised:
...
Error occurred on line: 144 (ABMApplication)
java.lang.RuntimeException: Method: getSessionManager not found in: org.eclipse.jetty.server.session.SessionHandler
...
I tried ServerHelloWorld that uses jserver and it works correctly.
The jetty server version has changed in the latest B4J release and some changes have to be introduced in the existing ABMaterial codes until next release...