Classes implementing compareTo should also implement equals (and thus hashCode)
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Key: DIRSERVER-1516
URL: https://issues.apache.org/jira/browse/DIRSERVER-1516
Project: Directory ApacheDS
Issue Type: Bug
Environment: All
Reporter: Felix Knecht
Following classes are lacking this problem
[apacheds-protocol-ntp]
org.apache.directory.server.ntp.messages.LeapIndicatorType
org.apache.directory.server.ntp.messages.ModeType
org.apache.directory.server.ntp.messages.ReferenceIdentifier
org.apache.directory.server.ntp.messages.StratumType
http://findbugs.sourceforge.net/bugDescriptions.html#EQ_COMPARETO_USE_OBJECT_EQUALS
This class defines a compareTo(...) method but inherits its equals() method
from java.lang.Object. Generally, the value of compareTo should return zero if
and only if equals returns true. If this is violated, weird and unpredictable
failures will occur in classes such as PriorityQueue. In Java 5 the
PriorityQueue.remove method uses the compareTo method, while in Java 6 it uses
the equals method.
>From the JavaDoc for the compareTo method in the Comparable interface:
It is strongly recommended, but not strictly required that
(x.compareTo(y)==0) == (x.equals(y)). Generally speaking, any class that
implements the Comparable interface and violates this condition should clearly
indicate this fact. The recommended language is "Note: this class has a natural
ordering that is inconsistent with equals."
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