Scala provides the possibility to define constructor argument that are class properties as well. I recoded the entity OrganisationAssociation to use j__organisations as argument. The example entity from my post Relations with Scala Collections and JPA looks like this: @Entity @Table(name = “org_assoc”) @SequenceGenerator(name = “org_assoc_id_seq”, sequenceName = “org_assoc_id_sequence”) class OrganisationAssociation extends MIPEntity { @Id [...]

Java Collection JPA’s One to Many and Many to Many relations require an attribute of type java.util.Collection like it is shown in the next example. This will be normally a List interface and a ArrayList implementation. … @OneToMany public Collection organisations = new ArrayList() … Unfortunately the Scala Library has a different interface concept that [...]