| Class loader error - two versions of Guava [message #1819260] |
Fri, 10 January 2020 15:31  |
 Steve Hickman
Messages: 13
Registered: January 2017 |
Junior Member |
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Using the code from https://github.com/nbhusare/EMF-Compare/ as an example and the EMF Compare Developer Guide, I've created a customized DifferenceFilter, DiffBuilder, FeatureFilter and PostProcessor. I've got JUnit5 tests using sample XText based models that pass (Both models stored as strings and models loaded from files).
The next step is to get all of this hooked into the UI. That's where I'm having a problem. I've followed the directions from the Developer's Guide to set up the extnsion points, and I've added the Content Type Association in Eclipse. When I did this initially, it worked - intermittently. Now it doesn't work at all.
The problem I'm getting is a class loader error (see below)
Caused by: java.lang.LinkageError: loader constraint violation: when resolving overridden method "com.honeywell.fractool.NoSemanticDifferenceFilter.getPredicateWhenSelected()Lcom/google/common/base/Predicate;" the class loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) of the current class, com/honeywell/fractool/NoSemanticDifferenceFilter, and its superclass loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader), have different Class objects for the type com/google/common/base/Predicate used in the signature
I suspect this worked in the past simply because the load order is unstable and occasionally happened to be in an order that was OK.
My questions are:
1) How to I solve this?
2) More generally, is there a troubleshooting guide for this kind of thing that I can refer to?
Other notes: This problem originally started with Eclipse 2019-09 on a Windows 10 machine. I've updated to Eclipse 2019-12. I've got the latest version of EMF Compare available via the Marketplace (3.3.8.201909101346). BTW - note that this is not the version that the EMF Compare site says should be part of the 2019-12 release. Don't know why. The same problem occurs with both versions of Eclipse.
[Updated on: Tue, 14 January 2020 17:03] Report message to a moderator |
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