Examples of javax.persistence.EntityManager.clear()

javax.persistence.EntityManager.clear()
Clear the persistence context, causing all managed entities to become detached. Changes made to entities that have not been flushed to the database will not be persisted. @throws IllegalStateException if this EntityManager has been closed

        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        CascadePersistEntity cpe1 = new CascadePersistEntity(startId);
        em.persist(cpe1);
        em.getTransaction().commit();
        em.clear();


        em.getTransaction().begin();
        CascadePersistEntity cpe2 = new CascadePersistEntity(startId + 1);
        CascadePersistEntity cpe3 = new CascadePersistEntity(startId);

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        FloatIdEntity persistedEntity = em.find(FloatIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        BooleanIdEntity persistedEntity = em.find(BooleanIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        d.setEmployees(emps);
        
        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        em.clear();
        
        resetSQL();
        d = findDepartment(em, d.getId());
        // assert the select did not contain the employee table
        assertNoneSQLAnyOrder("SELECT .* DC_EMPLOYEE .*");

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        d.setEmployees(emps);
        
        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        em.clear();
        
        resetSQL();
        d = findDepartment(em, d.getId());
        // assert the select did not contain the employee table
        assertNoneSQLAnyOrder("SELECT .* DC_EMPLOYEE .*");

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        StringIdEntity persistedEntity = em.find(StringIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        d.setEmployees(emps);
        
        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        em.clear();
        
        resetSQL();
        d = findDepartment(em, d.getId());
        // assert the select did not contain the employee table
        assertNoneSQLAnyOrder("SELECT .* DC_EMPLOYEE .*");

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        SQLBigIntegerIdEntity persistedEntity = em.find(SQLBigIntegerIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        em.persist(aCase);
        em.getTransaction ().commit ();


        verify(aCase, aText, aEvident);


        em.clear();


        ACase fACase = em.find(ACase.class, aCase.getId());
        AText fAText = fACase.getAText();
        AEvident fAEvident = fAText.getAEvidents().iterator().next();
        verify(fACase, fAText, fAEvident);

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        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        resetSQL();


        em.clear();
        
        d = findDepartment(em, d.getId());
        assertAnySQLAnyOrder("SELECT .* DC_DEP_PRD .*");
        resetSQL();
        products = d.getProducts();

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