[OPENJPA-2579] HandlerFieldStrategy installed on abstract class

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Auto Closed
• Affects Version/s: 2.3.0, 2.4.0
• Component/s: jdbc, jpa, kernel
• Assignee: Unassigned
• Reporter: jevardat
• Created: 29/Apr/15 09:13
• Updated: 05/May/15 09:04
• Resolved: 05/May/15 09:04

Description

Hello OpenJPA community

I submit this issue, because I ran into a rather weird behavior while using @Strategy on an abstract Entity having two subclasses that map to the actual tables.
I encounter the problem on both 2.3.0 and 2.4.0 version of openjpa.

The problem is that I received the exception

...
Caused by: <openjpa-2.4.0-r422266:1674604 fatal user error> org.apache.openjpa.persistence.ArgumentException: Attempt to map "gaia.cu7.om.input.TimeSeries.fObsTimes" failed: the owning entity is not mapped.
	at org.apache.openjpa.jdbc.meta.MappingInfo.assertTable(MappingInfo.java:628)
	at org.apache.openjpa.jdbc.meta.MappingInfo.createColumns(MappingInfo.java:558)
	at org.apache.openjpa.jdbc.meta.ValueMappingInfo.getColumns(ValueMappingInfo.java:178)
	at org.apache.openjpa.jdbc.meta.strats.HandlerStrategies.map(HandlerStrategies.java:65)
	at org.apache.openjpa.jdbc.meta.strats.HandlerFieldStrategy.map(HandlerFieldStrategy.java:82)
	at org.apache.openjpa.jdbc.meta.FieldMapping.setStrategy(FieldMapping.java:148)
	at org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(RuntimeStrategyInstaller.java:81)
	at org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.java:498)
	at org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:463)
	at org.apache.openjpa.jdbc.meta.ClassMapping.resolveNonRelationMappings(ClassMapping.java:895)
	at org.apache.openjpa.jdbc.meta.MappingRepository.prepareMapping(MappingRepository.java:416)
	at org.apache.openjpa.meta.MetaDataRepository.preMapping(MetaDataRepository.java:769)
	at org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:658)
	... 38 more

I'am not sure of the root cause of the problem but after debugging, I found that in the RunTimeStrategyInstaller, in the installStrategy method a handlerField strategy is installed even is the class is abstract.

public void installStrategy(FieldMapping field) {
        FieldStrategy strategy = null;
        ClassMapping owner = getOutermostDefiningMapping(field); 
        if (owner != null && !owner.isEmbeddable() && !owner.isAbstract())
            strategy = repos.namedStrategy(field, true);
...

And this strategy is installed because owner.isAbstract() is false, which I don't understand since the class is abstract and not mapped to any table. In my case only subclasses are mapped, I use TABLE_PER_CLASS strategy.

Obviously, when I do not use any strategy, the installed strategy is NoneFieldStrategy, but the ownser.isAbstract() is still false.

So Maybe the problem is elsewhere. Here is my mapping:

@Entity
@IdClass(TimeSeries.TimeSeriesId.class)
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Access(AccessType.FIELD)
@Immutable
public abstract class TimeSeries .... extends other abstract class not jpa mapped


@NotNull(message = "Observation times cannot be empty or null.")
@PersistentCollection(fetch = FetchType.EAGER)
@Strategy("gaia.cu7.om.dal.dictionary.PostgresArrayHandler2")
@Column(name = "obstimes", updatable = false)
protected double[] fObsTimes;

Thanks for any help
Gregory