isMember(elem, collection) - JPA CriteriaBuilder's method

Predicate isMember(
  E elem,
  Expression<C> collection

Create a predicate that tests whether an element is a member of a collection. If the collection is empty, the predicate will be false.
elem - element
collection - expression
is-member predicate
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.