correlate(parentJoin) - JPA Subquery's method

Join<X,Y> correlate(
  Join<X,Y> parentJoin

Create a subquery join object correlated to a join object of the enclosing query.
parentJoin - join object of the containing query
subquery join
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.