After the Update through Webconsole, zenloader servcie won't start

#:/opt/novell/zenworks/bin # ./zenloader
Exception in thread "main" java.lang.NoClassDefFoundError: org/jdom/JDOMException

Do I have lost some Environments Variables? (i.g. JAVA_HOME )
in my opinion, these settings are made in the init-script, aren't they?

thanks for helping
Andi