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I am trying to release a new version of my plugin but the build keeps failing with the exception
Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.ComparableTimSort.mergeLo(ComparableTimSort.java:744)
at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:481)
at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:406)
at java.util.ComparableTimSort.sort(ComparableTimSort.java:213)
at java.util.Arrays.sort(Arrays.java:1312)
at java.util.Arrays.sort(Arrays.java:1506)
at java.util.ArrayList.sort(ArrayList.java:1462)
at java.util.Collections.sort(Collections.java:143)
at hudson.ExtensionList.sort(ExtensionList.java:320)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:255)
at hudson.ExtensionList.iterator(ExtensionList.java:143)
at hudson.diagnosis.NullIdDescriptorMonitor.verify(NullIdDescriptorMonitor.java:68)
at hudson.diagnosis.NullIdDescriptorMonitor.verifyId(NullIdDescriptorMonitor.java:89)
I dont have a clue where the exception is comming from or what is wrong in my plugin. I would need some advise how to fix it.