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<a class="user-hover" rel="dpasek" id="email_dpasek" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=dpasek" style="color:#6c797f;">Denis Pasek</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-7829'>HHH-7829</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7829'><strong>NullPointerException when manually flushing One-To-One relationship with orphan removal</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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4.1.8, 4.1.7, 4.1.6, 4.1.5.SP1 </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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hibernate-one-to-one-defect_4.1.7.zip, hibernate-one-to-one-defect_4.1.8.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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27/Nov/12 9:29 AM
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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 having an inverse one-to-one bi-directional associations between two entities with orphan removal enabled Hibernate throws a NullPointerExceptions under the following conditions:</p>
<ul class="alternate" type="square">
<li>The bidirectional references are nulled out.</li>
<li>A manual flush is performed during the transaction.</li>
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<p style='margin-top:0;margin-bottom:10px;'>The NullPointerException is raised in the Cascade.cascadeProperty method on performing the flush on commit of the transaction. The problem is that the code tries to retrieve the EntityEntry for the referenced entity and tries to lookup the entity name for it (see Cascade.java:256ff):</p>
<p style='margin-top:0;margin-bottom:10px;'>final EntityEntry valueEntry = eventSource.getPersistenceContext().getEntry(loadedValue );<br/>
final String entityName = valueEntry.getPersister().getEntityName();</p>
<p style='margin-top:0;margin-bottom:10px;'>Resolving the entity name fails as the valueEntry is null during the second flush on commit of the transaction. The entity entry has already discarded during the manual flush.</p>
<p style='margin-top:0;margin-bottom:10px;'>This defect is a relic of fix for issue <a href="https://hibernate.onjira.com/browse/HHH-5267" title="NPE when updating a detached entity with a one-to-one association changed to null that is mapped with delete-orphan "><del>HHH-5267</del></a>, which works if you only perform a single flush during the lifecycle of a single entity manager/session.</p>
<p style='margin-top:0;margin-bottom:10px;'>In versions prior to 4.1.8 (i.e. before fix <a href="https://hibernate.onjira.com/browse/HHH-5267" title="NPE when updating a detached entity with a one-to-one association changed to null that is mapped with delete-orphan "><del>HHH-5267</del></a>) the problem was throwing a org.hibernate.PropertyAccessException since it was using the wrong entity name for delete cascading.</p>
<p style='margin-top:0;margin-bottom:10px;'>I have attached two test cases show casing the error situations caused by the manual flush on these one-to-one associations.<br/>
Code wise the test cases are exactly the same but one case uses Hibernate 4.1.8 and the other one 4.1.7.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Hibernate 4.1.8
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DB Platforms tested: Oracle, H2
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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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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
core
one-to-one
orphan-removal
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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="dpasek" id="email_dpasek" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=dpasek" style="color:#6c797f;">Denis Pasek</a>
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