joinSet(attributeName, jt) - JPA From's method

SetJoin<X,Y> joinSet(
  String attributeName,
  JoinType jt

Create a join to the specified Set-valued attribute using the given join type.
attributeName - name of the attribute for the target of the join
jt - join type
the resulting join
IllegalArgumentException - if attribute of the given name does not exist
JPA 2.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.