Minor Description
For a ManyToMany relationship, I attempted to use the following in the orm to persist the related entities:
<persistence-unit-metadata>
<persistence-unit-defaults>
<delimited-identifiers/>
</persistence-unit-defaults>
</persistence-unit-metadata>
Although openjpa appears to find this, it doesn't use it in an em.persist(). It does work, however, if I put cascade=CascadeType.persist on the @ManyToMany annotation of the entity that is specifically persisted.