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Showing content from https://docs.pmd-code.org/pmd-doc-7.0.0/pmd_rules_kotlin_errorprone.html below:

Error Prone | PMD Source Code Analyzer

Rules to detect constructs that are either broken, extremely confusing or prone to runtime errors.

Since: PMD 7.0.0

Priority: Medium (3)

Override both public boolean Object.equals(Object other), and public int Object.hashCode(), or override neither. Even if you are inheriting a hashCode() from a parent class, consider implementing hashCode and explicitly delegating to your superclass.

This rule is defined by the following Java class: net.sourceforge.pmd.lang.kotlin.rule.errorprone.OverrideBothEqualsAndHashcodeRule

Example(s):

class Bar {        // poor, missing a hashCode() method
    override fun equals(o: Any?): Boolean {
      // do some comparison
    }
}

class Baz {        // poor, missing an equals() method
    override fun hashCode(): Int {
      // return some hash value
    }
}

class Foo {        // perfect, both methods provided
    override fun equals(other: Any?): Boolean {
      // do some comparison
    }
    override fun hashCode(): Int {
      // return some hash value
    }
}

Use this rule by referencing it:

<rule ref="category/kotlin/errorprone.xml/OverrideBothEqualsAndHashcode" />

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