Difference between revisions of "Object Model Violation: Just One of equals() and hashCode() Defined"

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Revision as of 09:46, 19 July 2006

This article includes content generously donated to OWASP by Fortify.JPG.

This is a Vulnerability. To view all vulnerabilities, please see the Vulnerability Category page.


This class overrides only one of equals() and hashCode().


Java objects are expected to obey a number of invariants related to equality. One of these invariants is that equal objects must have equal hashcodes. In other words, if a.equals(b) == true then a.hashCode() == b.hashCode().

Failure to uphold this invariant is likely to cause trouble if objects of this class are stored in a collection. If the objects of the class in question are used as a key in a Hashtable or if they are inserted into a Map or Set, it is critical that equal objects have equal hashcodes.


The following class overrides equals() but not hashCode().

 public class halfway() {
   public boolean equals(Object obj) {

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