CWE-581 对象模型违背：仅定义了一个等式与散列码

Object Model Violation: Just One of Equals and Hashcode Defined

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

The software does not maintain equal hashcodes for equal objects.

扩展描述

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().

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 573 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 697 cwe_View_ID: 1000

• cwe_Nature: ChildOf cwe_CWE_ID: 573 cwe_View_ID: 699 cwe_Ordinal: Primary

适用平台

Language: {'cwe_Name': 'Java', 'cwe_Prevalence': 'Undetermined'}

常见的影响

范围	影响	注释
['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.

可能的缓解方案

Implementation

策略:

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

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
The CERT Oracle Secure Coding Standard for Java (2011)	MET09-J		Classes that define an equals() method must also define a hashCode() method

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