Hey turkmanmc ..
I guess besides ~/jetty/webapps/zimbra you will have to 'ln' service directory too ~/jetty/webapps/service/WEB-INF/
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ln -s /opt/zimbra/jetty/webapps/service/WEB-INF/lib
/opt/zimbra/jetty/webapps/zimlet/WEB-INF/lib
Do the same for tags and tlds.
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Besides there is a file, ~/jetty/webapps/service/WEB-INF/zimbra.tld. Just see if it needs a linking too.
See the last comments of this bug report
41487