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how to persist an object twice into two diff. collections of two diff. classes

ok my problem,    i persist a Squad Object into a Cup Object at the beginning, after i have to create and persist a competition object in which i have to put some of the already created/persisted squads. the final method looks like that: public void actionPerformed(ActionEvent e) { List
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how to query by properties of onetomany relations? (Error 990)

.getTransaction().begin();         Foo foo = new Foo();         foo.bars.add(new Bar("aaa"));         em
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How to Remove records from many to many relationship tables in JPA

); entityManager.getTransaction().begin(); entityManager.remove(conclusion); entityManager
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How to use JOIN FETCH?

().begin();   Person p = new Person();   p.setName("Peter Smith");   Address address1 = new
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IMK Stall with certain query

: String param = "%"+begining+"%"; CriteriaBuilder cb = DataBase.em.getCriteriaBuilder(); CriteriaQuery
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IN operator syntax

(); em.getTransaction().begin(); MyEntity e = new MyEntity(1); em.persist(e
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Index on map key

.createEntityManager();         em.getTransaction().begin();         for (int i = 0; i < 100000; i
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Issue with Casting / Joins

.createEntityManager();                 em.getTransaction().begin();         MyEntity entity = new MyEntity
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Issue with TYPE expression in Criteria API

();         em.getTransaction().begin();         em.persist(new Contact("Contact One"));         em
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Issue with UPPER ?

of Case(2) with all UPPER removed from the beginning of the query until it started suddenly working