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<img id="email-avatar" src="https://hibernate.onjira.com/secure/useravatar?avatarId=10162" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
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<a class="user-hover" rel="misterd" id="email_misterd" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=misterd" style="color:#6c797f;">Joscha Drechsler</a>
created <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7726'>HHH-7726</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7726'><strong>Inconsistent behavior for cascade="all-delete-orphan" collections when committing an update removing items.</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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4.1.3, 3.6.3 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Attachments:</strong>
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deleteorphantest.zip </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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core </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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26/Oct/12 6:01 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>When using a many-to-one relation mapped as cascade="all-delete-orphan", committing an update that removes children from the collection results in inconsistent behavior. I have observed the following alternatives:</p>
<ul>
<li>removing children through parent.getChildren().clear() on the PersistentCollection wrapper put in place during insert and then committing the change using session.update(parent) or session.merge(parent) correctly deletes the children instances from the database.</li>
<li>removing children through parent.setChildren(new java.util.HashSet<>()), which removes the PersistentCollection wrapper and then committing the change using session.merge(parent) works correctly as well.</li>
<li>removing children through parent.setChildren(null) and then committing the change using session.merge(parent) throws org.hibernate.HibernateException: A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: Parent.children</li>
<li>removing children through parent.setChildren(new java.util.HashSet<>()) or parent.setChildren(null) and then committing the change using session.update(parent) removes the children from the parent's list, but fails to delete the children instances from the database.</li>
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<p style='margin-top:0;margin-bottom:10px;'>i have attached a small readily configured maven project that displays the result of all six cases in a JUnit test case (class delteorphantest.DeleteOrphanTest in src/test/java folder) using the hibernate 4.1.3. As mentioned in the environment section, the same behavior can be observed with the older 3.6.3.Final version of hibernate as well. This example uses a Set one-to-many relation, but i tested this with a List one-to-many relation too with the same results.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Tested on 3.6.3.Final and 4.1.3.Final, identical behavior with both versions. Tested against HSQLDB in-memory database (versions 2.0.0 and 2.2.8), but i think this is independent from the database platform.
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Labels:</strong>
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hibernate
core
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="misterd" id="email_misterd" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=misterd" style="color:#6c797f;">Joscha Drechsler</a>
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