I use OCLinEcore in my project and use constraint for validation. The following error appears:
1-Error injecting method, java.lang.IllegalStateException: Missing contribution for type: org.eclipse.xtext.ui.containers.JavaProjectsState ...
I use OCL 6.0.0.
It works in Eclipse Mars2 Release 4.5.2 but it didn't work in our coding environment. Which jars could be blocking OCL plugins?
Ouch! Eclipse OCL is now on 6.14.0. Mars was over 5 years ago. Major disruption has occurred through changes in Java in that time so I suspect that some aspect of your configuration is inconsistent. Recent Eclipse OCL releases have been tested on Oxygen and later. I recommend that you ensure that you use a consistent recent release. (I cannot fully recommend the very latest Eclipse OCL for which a 6.14.1 maintenance release is imminent.)