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joinCollection(attributeName) - JPA From's method

CollectionJoin<X,Y> joinCollection(
  String attributeName

Create an inner join to the specified Collection-valued attribute.
attributeName - name of the attribute for the target of the join
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.