Hi Erik, "Comparison method violates its general contract!" means, I think, that there's an error in the implementation of the compare() method; see eg [1] for some discussion.
My suspicion is that the problem has always been there but the new version of Isis is maybe causing it to trip where previously it didn't. If you could post the implementation of compare() for that entity, then we could take a look. Thx Dan [1] http://stackoverflow.com/a/8327575/56880 On Wed, 21 Dec 2016 at 08:50 Erik de Hair <[email protected]> wrote: > Hi, > > I upgraded to Apache Isis 1.13.2 but now when opening a certain entity I > get an exception: > > Caused by: java.lang.IllegalArgumentException: Comparison method > violates its general contract! > at java.util.TimSort.mergeLo(TimSort.java:777) > at java.util.TimSort.mergeAt(TimSort.java:514) > at java.util.TimSort.mergeForceCollapse(TimSort.java:457) > at java.util.TimSort.sort(TimSort.java:254) > at java.util.Arrays.sort(Arrays.java:1438) > at > com.google.common.collect.Ordering.immutableSortedCopy(Ordering.java:888) > at > > com.google.common.collect.FluentIterable.toSortedList(FluentIterable.java:501) > at > > org.apache.isis.core.metamodel.services.grid.bootstrap3.GridSystemServiceBS3.validateAndNormalize(GridSystemServiceBS3.java:466) > at > > org.apache.isis.core.metamodel.services.grid.GridSystemServiceAbstract.normalize(GridSystemServiceAbstract.java:164) > at > > org.apache.isis.core.metamodel.services.grid.GridServiceDefault.normalize(GridServiceDefault.java:102) > at > > org.apache.isis.core.metamodel.facets.object.grid.GridFacetDefault.load(GridFacetDefault.java:75) > at > > org.apache.isis.core.metamodel.facets.object.grid.GridFacetDefault.getGrid(GridFacetDefault.java:65) > at > > org.apache.isis.viewer.wicket.ui.pages.entity.EntityPage.buildPage(EntityPage.java:175) > at > > org.apache.isis.viewer.wicket.ui.pages.entity.EntityPage.<init>(EntityPage.java:114) > at > > org.apache.isis.viewer.wicket.ui.pages.entity.EntityPage.<init>(EntityPage.java:82) > at > > org.apache.isis.viewer.wicket.ui.pages.entity.EntityPage.<init>(EntityPage.java:63) > ... 51 more > > A quick debugging session didn't help me out. May be somebody can point > me at the right direction. It looks like it has something to do with the > entity's actions but I don't know what. > > Thanks, > Erik >
