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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-5409?atlOrigin=eyJpIjoiOGQ2NDBiNzcwYTBhNDEzYTg3ODMzYzkyMmFjMWM2NjMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: bag and idbag should implement equals() and hashCode() the same way as other collections</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">Please reconsider implementing equals and hashcode differently.</p> <p style="margin: 10px 0 0">As PersistenBag implements List it should adhere to the interface truthfully. Given a <tt>LinkedList l</tt> and a <tt>PersistentBag b</tt>, each containing only Objects having the same value, but not being the same instance leads to the following behavior:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
b.equals(l) == <span class="code-keyword" style="color: #000091">false</span>
l.equals(b) == <span class="code-keyword" style="color: #000091">true</span>
</pre>
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</div> <p style="margin: 10px 0 0">This violates <a href="https://docs.oracle.com/javase/10/docs/api/java/lang/Object.html#equals(java.lang.Object)" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">the contract of equals, which states: </a></p>
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<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">Indicates whether some other object is "equal to" this one.
The equals method implements an equivalence relation on non-null object references:
It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.
</pre>
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</div> <p style="margin: 10px 0 0">The violated attribute is the symmetry:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
l.equals(b) != b.equals(l)
</pre>
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