Generic and Abstract Relationship Entity

We have the following scenario: 2 NodeEntity class (A and B) linked by a RelationshipEntity (L) which is abstract and parametrized. Here a simple stub of our classes:

@RelationshipEntity
public abstract class L<T> {

    private T property;

    @StartNode
    private A a;

    @EndNode
    private B b;
}

@NodeEntity
public final class A <T> {

    @Relationship
    private List<L<T>> listOfLs;

}

@NodeEntity
public final class B {
       //some stuff here
}

We have two kind of problems concerning listOfLs relationship:

1. the first is related to the closed bug (https://github.com/neo4j/neo4j-ogm/issues/45) and involves the dynamic binding of classes extending the (abstract) L class. For example, if CL1 and CL2 extend L, the OGM does not seem to correctly save the objects with the right subtype (CL1 or CL2) without specify the relathionship type (for our use cases is impossible to define it at compile time).
2. the second issue is related to type parameter in generic class handling. The use of generic type in the element of the listOfLs throws the exception below:

Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: it.cnr.ilc.lc.omega.entity.L<TT
    at org.neo4j.ogm.metadata.ClassUtils.getType(ClassUtils.java:94)
    at org.neo4j.ogm.mapper.EntityGraphMapper.mapEntityReferences(EntityGraphMapper.java:237)
    at org.neo4j.ogm.mapper.EntityGraphMapper.mapEntity(EntityGraphMapper.java:158)
    at org.neo4j.ogm.mapper.EntityGraphMapper.map(EntityGraphMapper.java:91)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:67)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:43)
    at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:386)
    at it.cnr.ilc.lc.omega.test.Tester.test6(Tester.java:247)
    at it.cnr.ilc.lc.omega.test.Tester.main(Tester.java:43)
Caused by: java.lang.ClassNotFoundException: it.cnr.ilc.lc.omega.entity.L<TT
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.neo4j.ogm.metadata.classloader.MetaDataClassLoader.loadClass(MetaDataClassLoader.java:34)
    at org.neo4j.ogm.metadata.ClassUtils.getType(ClassUtils.java:92)
    ... 8 more

[ArashJalalian]

Any solution for this?

[mihairaulea]

I think the user is trying to link A and B type nodes with relationships that have properties of a certain type. This would be useful for querying the graph by relationship property type. This is a more suitable use case for Cypher.