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thjanssen/JoinFetch.java

Last active June 24, 2016 02:10
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JoinFetch.java
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
Author a = em.createQuery("SELECT a FROM Author a JOIN FETCH a.books WHERE a.id = 1", Author.class).getSingleResult();
em.getTransaction().commit();
em.close();
log.info(a.getFirstName()+" "+a.getLastName()+" wrote "+a.getBooks().size()+" books.");
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ThrowLazyInitializationException.java
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
Author a = em.createQuery("SELECT a FROM Author a WHERE id = 1", Author.class).getSingleResult();
em.getTransaction().commit();
em.close();
log.info(a.getFirstName()+" "+a.getLastName()+" wrote "+a.getBooks().size()+" books.");
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