CWE-581 - Object Model Violation: Just One of Equals and Hashcode Defined
CWE-581
- Abstraction:
- Variant
- Structure:
- Simple
- Status:
- Draft
- Weakness Name
Object Model Violation: Just One of Equals and Hashcode Defined
- Description
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().
- Common Consequences
Scope: Integrity, Other
Impact: Other
Notes: 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.
- Related Weaknesses
- Release Date:
- 2006-12-15
- Latest Modification Date:
- 2024-02-29
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