Hello,
Seems I am completely knotted in a convoluted class graph without any hint
from documentation, spec or forum archive.
Could somebody enlighten me if it is possible to:
A. Have a Key in a persistent Map<Key,Value> such as
1. the Key has a composite ID composed of classes which have composite IDs
themselves?
and
2. They Key is an abstract class that is also used in a Value as a parent
in ManyToOne relationship being the part of the Values identity (actual
objects - parent and Value being rather different entities)
Hope this example clarifies this rather complicated scenario:
//abstract class of which children are Values in a map
@Entity
@IdClass(AbstractTS.TSId.class) //TSId covers SomeOtherClass identity too
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class AbstractTS
{
@id SomeOtherClass parent;
@id int local_id;
@OneToMany
private Map<ModelId, DerivedTS> derivedMap; // DerivedTS inherits from
AbstractTS - seems to impossible to be mapped properly.
}
// abstract class that has common identity and some additional fields, it is
a Key in a map
@Inheritance(strategy = InheritanceType.JOINED)
@MappedSuperclass
@IdClass(ModelId.ModelImplId.class)
public abstract class AbstractModel {
@id AbstractTS parent;
@id int x;
@id double y;
@Basic
@Lob
double[] some_common_data;
}
// Identity domain class, that is in fact stripped down version of an
abstractModel, both reuse same ID class, used to retrieve unknown models.
@IdClass(ModelId.ModelImplId.class)
@Embeddable
public class ModelId {
@ManyToOne
public AbstractTS parentTS; //could be either DerivedTS or RawTS.
@Id
@Basic
public double some_value;
@Id
public int modelType;
@Basic
int some_derived_value;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
//identity derived from AbstractTS
public class RawTS extends AbstractTS
{
@Basic
int some_values;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@IdClass(DerivedTS.DerivedTSId.class) // inherits from TSId with additional
Identities for parentTS and parentModel
public class DerivedTS extends AbstractTS {
@ManyToOne
//@PrimaryKeyJoinColumns(..) // possibly to provide direct mappings to
either RawTS or DerivedTS identity fields
@Id
private AbstractTS parentTS;
@Id
@ManyToOne
//@PrimaryKeyJoinColumns( {... }) //possibly to provide direct
mappings to any model derived from AbstractModel
private AbstractModel parentModel = null;
}
To create any working mapping for
Map<ModelId, DerivedTS> seems like an impossible mission, I would appreciate
any hints if it is doable at all.
I tried various combinations of @ManyToOne combined with @PrimaryKeys,
@MapPrimaryKeys, @ElementCollection etc.
Persistence.xml lists all the classes, using openjpa 2.0.0 snapshot.
The last error I got is during enhancement:
[java] Exception in thread "main" <openjpa-2.0.0-SNAPSHOT-r422266:798026
fatal user error> org.apache.openjpa.util.MetaDataException: Errors
encountered while resolving metadata. See nested exceptions for details.
[java] at
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:578)
[java] at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:323)
[java] at
org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:625)
[java] at
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:556)
[java] at
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:323)
[java] at
org.apache.openjpa.enhance.PCEnhancer.<init>(PCEnhancer.java:251)
[java] at
org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4593)
[java] at
org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4540)
[java] at
org.apache.openjpa.enhance.PCEnhancer$1.run(PCEnhancer.java:4510)
[java] at
org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:726)
[java] at
org.apache.openjpa.lib.conf.Configurations.runAgainstAllAnchors(Configurations.java:711)
[java] at
org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4505)
[java] at
org.apache.openjpa.enhance.PCEnhancer.main(PCEnhancer.java:4496)
[java] Caused by: <openjpa-2.0.0-SNAPSHOT-r422266:798026 fatal user
error> org.apache.openjpa.util.MetaDataException: Field
"DerivedTS.parentModel" cannot be a primary key. It is of an unsupported
type.
[java] at
org.apache.openjpa.meta.ClassMetaData.validateAppIdClassPKs(ClassMetaData.java:2105)
[java] at
org.apache.openjpa.meta.ClassMetaData.validateAppIdClass(ClassMetaData.java:1989)
[java] at
org.apache.openjpa.meta.ClassMetaData.validateIdentity(ClassMetaData.java:1925)
[java] at
org.apache.openjpa.meta.ClassMetaData.validateMeta(ClassMetaData.java:1842)
[java] at
org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1704)
[java] at
org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:733)
[java] at
org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:631)
[java] at
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:556)
[java] ... 12 more
[java] NestedThrowables:
It fails in validateAppIdClassPKs, but it is hard to guess with what type:
...
2101 case JavaTypes.PC_UNTYPED:
2102 case JavaTypes.COLLECTION:
2103 case JavaTypes.MAP:
2104 case JavaTypes.OID: // we're validating embedded fields
2105 throw new MetaDataException(_loc.get("bad-pk-type",
2106 fmds[i]));
....
Does it mean Composite IDs are banned in Map's Key completely?
Best regards,
Krzysztof
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