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1. How to set collection items for in-clause in jpql?    stackoverflow.com

Is there a possiblity in JPA 2.0 to set a collection for in-clause in jpql-query? (I'm using EclipseLink) The next example fails: 

TypedQuery<Person> q = em.createQuery("select p from Person p where p.name in (?1)", ...

2. Problem in managing bi-directional relationships in JPA: removing from a collection    stackoverflow.com

My domain model has a self-referencing bi-directional relationship with relationship management done in the entity: 

@Entity
public class Users implements BaseEntity<String>, Serializable {

    @Id
    private String username;
 ...

3. How to have 2 collections of the same type in JPA? (EclipseLink)    stackoverflow.com

Wondering how to do what is specified in How to have 2 collections of the same type in JPA?, but with EclipseLink rather than Hibernate. See that post below:

...