JEE5 Sample

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EJB3

Injection vom EntityManager in einem EJB:

   @PersistenceContext(unitName="WebLearingPlatformEAR-ejbPU")
   protected EntityManager em;

JPA

Bikirektionale One To Many Beziehung

In der Klasse Question.java

    @OneToMany(mappedBy="question", cascade = {CascadeType.PERSIST, CascadeType.MERGE} )
    private List<QuestionOption> options = new ArrayList<QuestionOption>();

In der Klasse QuestionOption.java

    @ManyToOne(optional=false, fetch = FetchType.EAGER)
    @JoinColumn(name="questionid", nullable=false)
    private Question question;

Resourcen

• Java Server Faces
• Log4J