org.hibernate.ObjectDeletedException: deleted instance passed to merge

參考解決辦法:

http://stackoverflow.com/questions/13059241/org-hibernate-objectdeletedexception-deleted-instance-passed-to-merge

Before an entity removed, this entity must be manage state. We can use some of the functionmerge,find, etc. Note : After EntityManager is closed, all the entities of its will be detached.

public void remove(Person p) {
    Perosn p2 = em.merge(p);
    em.remove(p2);
}

刪除以前，必須是manage 狀態，可以使用find  或者 merge 函數，將他變爲manage狀態。

JPA的生命週期介紹，參考:  http://evil850209.iteye.com/blog/1932070