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JPA Annotations for Relationships

Relationships are persistent fields in persistable classes that reference other entity objects. The four relationship modes are represented by the following annotations:

Unlike ORM JPA implementations, ObjectDB does not enforce specifying any of the annotations above. Specifying a relationship annotation enables configuring cascade and fetch policy, using the following enum types:

Additional annotations are supported by ObjectDB for the inverse side of a bidirectional relationship (which is calculated by a query) :

Details about all these annotations are provided in Chapter 2 of the ObjectDB manual.