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<a class="user-hover" rel="beamerblvd" id="email_beamerblvd" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=beamerblvd" style="color:#6c797f;">Nick Williams</a>
commented on <img src="https://hibernate.atlassian.net/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-8111'>HHH-8111</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.atlassian.net/browse/HHH-8111'><strong>AttributeConverter doesn't override built-in type mappings</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>In my attached sample, I had failed to annotate the <tt>AttributeConverter</tt> implementation with <tt>@Converter</tt>. (I had done this in my real application, but in my simple test case forgot it.) I get a different exception now that I've added it. It doesn't matter whether I annotate it <tt>@Converter</tt>, <tt>@Converter(autoApply = false)</tt>, or <tt>@Converter(autoApply = true)</tt>, I get the same exception:</p>
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<pre>javax.persistence.PersistenceException: org.hibernate.HibernateException: Unknown unwrap conversion requested: java.lang.StackTraceElement to java.lang.String
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1561)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1486)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1492)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1002)
at net.nicholaswilliams.java.TestClass.persistComplexEntities(TestClass.java:90)
at net.nicholaswilliams.java.TestClass.main(TestClass.java:135)
Caused by: org.hibernate.HibernateException: Unknown unwrap conversion requested: java.lang.StackTraceElement to java.lang.String
at org.hibernate.type.descriptor.java.AbstractTypeDescriptor.unknownUnwrap(AbstractTypeDescriptor.java:103)
at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.unwrap(SerializableTypeDescriptor.java:114)
at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.unwrap(SerializableTypeDescriptor.java:44)
at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:64)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:93)
at org.hibernate.mapping.SimpleValue$AttributeConverterSqlTypeDescriptorAdapter$1.doBind(SimpleValue.java:491)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:93)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:281)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:276)
at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:56)
at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2793)
at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2768)
at org.hibernate.persister.entity.AbstractEntityPersister$4.bindValues(AbstractEntityPersister.java:2975)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2982)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3494)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:97)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:364)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:205)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:185)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:169)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:322)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:126)
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:84)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:209)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:152)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:854)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:828)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:832)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:996)
... 2 more</pre>
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<p>Stepping through the code again, it appears what happened is Hibernate DID recognize my converter and DID call <tt>convertToDatabaseColumn</tt> in <tt>org.hibernate.mapping.SimpleValue$AttributeConverterSqlTypeDescriptorAdapter$1.doBind</tt>, and in the highest call to <tt>org.hibernate.type.descriptor.sql.BasicBinder.bind</tt> the value changed from a <tt>StackTraceElement</tt> to a <tt>String</tt>. This <tt>String</tt> should be able to be persisted to a <tt>VARCHAR</tt> column. However, the <tt>org.hibernate.type.descriptor.java.SerializableTypeDescriptor.unwrap</tt> method only allows types <tt>byte[]</tt>, <tt>InputStream</tt>, <tt>BinaryStream</tt> and <tt>Blob</tt>.</p>
<p>On a hunch, based on the bug description, I changed the return type / argument type of the entity's <tt>Location</tt> field accessor/mutator from <tt>StackTraceElement</tt> to <tt>Object</tt>, and changed the <tt>AttributeConverter</tt> so that it converts <tt>Objects</tt> instead of <tt>StackTraceElement</tt> (just calling <tt>toString()</tt>). Now it uses a different, random persistence strategy every time. Once it's <tt>BigDecimalTypeDescriptor</tt>, then it's <tt>ShortTypeDescriptor</tt>, then it's <tt>ArrayMutabilityPlan</tt>, then it's <tt>BlobTypeDescriptor$BlobMutabilityPlan</tt>, and so on. Each time I run it it picks a random plan, sometimes repeating, sometimes not.</p>
<p>It appears Hibernate is trying to determine how to persist the field based on the <em>field type</em> (in this example, first <tt>StackTraceElement</tt>, later <tt>Object</tt>) instead of the <em>return type of the converter</em> (in this example, <tt>String</tt>). If I change the field type to some other class that isn't <tt>Serializable</tt> and isn't castable to one of the types Hibernate natively supports (in this case, custom class <tt>SpecialType</tt>), it works. Hibernate should formulate a persistence strategy based on the <em>return type of the converter</em>.</p>
<p>I repeat the question from the previous comment. Can this be fixed for beta3? <img class="emoticon" src="https://hibernate.atlassian.net/images/icons/emoticons/smile.gif" height="20" width="20" align="absmiddle" alt="" border="0"/></p></div>
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