In consequence javadoc is not available in the editor on Groovy-all functions.
The issue is caused to the naming of the src jar which is not matching with the binary one
working:
groovy-all-1.8.6-sources.jar
groovy-all-1.8.6.jar
not working:
groovy-2.3.3-sources.jar --> should be renamed to groovy-all-2.3.3-sources.jar
groovy-all-2.3.3.jar

reported previously on JIRA https://jira.codehaus.org/browse/GRECLIPSE-1822
pull requets awaiting Review and Merge: #110