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Posted to issues@commons.apache.org by "Zhiqiang Zang (Jira)" <ji...@apache.org> on 2019/11/21 20:46:00 UTC

[jira] [Created] (LANG-1499) Equals transitivity is violated in EqualsBuilder

Zhiqiang Zang created LANG-1499:
-----------------------------------

             Summary: Equals transitivity is violated in EqualsBuilder
                 Key: LANG-1499
                 URL: https://issues.apache.org/jira/browse/LANG-1499
             Project: Commons Lang
          Issue Type: Bug
          Components: lang.builder.*
    Affects Versions: 3.9
         Environment: Ubuntu 18.04

JDK 1.8.0_221

Commons Lang 3.9-RC2

JUnit 5.4
            Reporter: Zhiqiang Zang
         Attachments: EqualsTransitivityTest.java

EqualsBuilder.reflectionEquals() does not hold transitivity when comparing two subclasses extending a common superclass. For example:

Given that both class D and E are subclasses of class C, C == D and C == E should imply D == E. However EqualsBuilder.reflectionEquals(D, E) returns *false* when both EqualsBuilder.reflectionEquals(C, D) and EqualsBuilder.reflectionEquals(C, E) return true.

A junit test is provided as attachment.



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