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2011-03-08T22:21:52.580
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As indicated in my comment above, I have tried the same with EclipseLink and it works. After creating some test data, I've cleared the discriminator value of a person entry in the DB and now I get a similar exception when trying to load the associated location. EclipseLink's message is a little bit more descriptive: <pre><code>Exception Description: Missing class for indicator field value [] of type [class java.lang.String]. Descriptor: RelationalDescriptor(com.mklinke.webtest.domain.Person --> [DatabaseTable(PERSON)]) at org.eclipse.persistence.exceptions.DescriptorException.missingClassForIndicatorFieldValue(DescriptorException.java:937) at org.eclipse.persistence.descriptors.InheritancePolicy.classFromValue(InheritancePolicy.java:355) at org.eclipse.persistence.descriptors.InheritancePolicy.classFromRow(InheritancePolicy.java:342) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:485) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:456) at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:723) at org.eclipse.persistence.queries.ReadObjectQuery.registerResultInUnitOfWork(ReadObjectQuery.java:766) at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:451) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1080) at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:808) ... </code></pre> The mapping seems to work, so unless the data is "corrupt" (which it isn't in your case as you said), it's probably a bug or at least different behavior in Hibernate.
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1. This table or related slice is empty.
PostParentId
1. POJPA @OneToOne throws Error when mapped to an abstract @Entity with subclasses
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1. PTAnswer
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1. USMartin Klinke
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.