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correlate(parentRoot) - JPA Subquery's method

Root<Y> correlate(
  Root<Y> parentRoot

Create a subquery root correlated to a root of the enclosing query.
parentRoot - a root of the containing query
subquery root
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.