Hello,
I have the same issue.
In my case it seems that some JARs files are missing in the build path of the project.
For example, jstl.jar / standard.jar / org.apache.sling.api-2.2.0.jar are not found and it result in some un-resolved import and taglibs in the "libs/foundation/global.jsp" jsp.
Import those libraries manually will solve a part of the problem...
But the Java Content Assist is still not available : No auto completion, no drop down list (in CRXDE with CQ5.5).
Any progress ?
Thanks.