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  1. OpenJPA
  2. 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
    • Fix Version/s: None
    • Component/s: jdbc, jpa, kernel
    • Labels:


      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:

      @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
      public abstract class TimeSeries .... extends other abstract class not jpa mapped
      @NotNull(message = "Observation times cannot be empty or null.")
      @PersistentCollection(fetch = FetchType.EAGER)
      @Column(name = "obstimes", updatable = false)
      protected double[] fObsTimes;

      Thanks for any help




            • Assignee:
              jevardat jevardat
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