How to implement update () method in DAO using EntityManager (JPA)?

According to the JPA specifications EntityManager#merge() will return a reference to another object than the one passed in when the object was already loaded in the current context. So, I'd rather return the result of the merge() and write the update() method like this.

According to the JPA specifications, EntityManager#merge() will return a reference to another object than the one passed in when the object was already loaded in the current context. So, I'd rather return the result of the merge() and write the update() method like this: @PersistenceContext private EntityManager em; public User update (User transientUser) { return em. Merge(transientUser); } Then, use it like this (skipping the initialization part): user.

SetPhone("YYYYYY"); user = dao. Update(user).

Change the property and then use EntityManager merge() java.sun.com/javaee/5/docs/api/javax/per....

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