Object Model Violation: Just One of Equals and Hashcode Defined

Opis

The product does not maintain equal hashcodes for equal objects.

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().

Skutki

• Integrity, Other

  Other

  If this invariant is not upheld, it 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.

Zapobieganie

• Implementation

  Both Equals() and Hashcode() should be defined.

Słabość nadrzędna

• CWE-573 Improper Following of Specification by Caller
• CWE-697 Incorrect Comparison

Kiedy powstaje

• Implementation

Dotyczy

Java