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I know this has been an issue for a while now, and checked all previously answers I could get, but still this one doesn't work. The object 'crew' represents crewmembers with ranks and other items. The comparison should be made by comparing 'assigned_rank', an int value, and if this value is equal in both instances, then 'is_trainer', a boolean, should make the difference. This method worked great as long as it was running with java < 7. But since Java 7 I keep getting this one: java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.ComparableTimSort.mergeLo(ComparableTimSort.java:714) at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:451) at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:376) at java.util.ComparableTimSort.sort(ComparableTimSort.java:182) at java.util.ComparableTimSort.sort(ComparableTimSort.java:146) at java.util.Arrays.sort(Arrays.java:472) at java.util.Collections.sort(Collections.java:155) at dormas_flightlog.Query.getCrew(Query.java:714) Here is the source, where some potentially dangerous parts have allready been out-commented, but it still does not work: public class crew implements Serializable, Comparable<crew> { private static final long serialVersionUID = 36L; private int flightID = 0; private int assigned_rank = 25; private boolean is_trainer = false; ... @Override public int compareTo(crew him) { int myRank = this.getAssigned_rank(); int hisRank = him.assigned_rank; if (this == him) { return 0; } if (myRank > hisRank) { return 1; } if (myRank < hisRank) { return -1; } if (myRank == hisRank) { // if (is_trainer && !o.is_trainer) { // i = 1; // } // if (!is_trainer && o.is_trainer) { // i = -1; // } // if (is_trainer &

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