Comparison method violates its general contract! Java 7 only

by

see this:

From http://www.oracle.com/technetwork/java/javase/compatibility-417013.html#source

Area: API: Utilities Synopsis: Updated sort behavior for Arrays and
Collections may throw an IllegalArgumentException

Description: The sorting algorithm used by java.util.Arrays.sort and
(indirectly) by java.util.Collections.sort has been replaced. The new
sort implementation may throw an IllegalArgumentException if it detects
a Comparable that violates the Comparable contract. The previous
implementation silently ignored such a situation. If the previous
behavior is desired, you can use the new system
property java.util.Arrays.useLegacyMergeSort, to restore previous
mergesort behavior.

Nature of Incompatibility: behavioral

RFE: 6804124

For more detailed info, see the bug database reference here.

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