[LANG-1499] Equals transitivity is violated in EqualsBuilder

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.9
• Component/s: lang.builder.*
• Labels: Equals() EqualsBuilder transitivity

Environment

Ubuntu 18.04

JDK 1.8.0_221

Commons Lang 3.9-RC2

JUnit 5.4

• Assignee: Unassigned
• Reporter: Zhiqiang Zang
• Created: 21/Nov/19 20:45
• Updated: 11/Jun/20 00:55

Description

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.