persist

PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate

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I have a JPA-persisted object model that contains a many-to-one relationship: an Account has many Transactions. A Transaction has one Account. Here’s a snippet of the code: @Entity public class Transaction { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @ManyToOne(cascade = {CascadeType.ALL},fetch= FetchType.EAGER) private Account fromAccount; …. @Entity public class Account { @Id @GeneratedValue(strategy = … Read more

JPA EntityManager: Why use persist() over merge()?

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EntityManager.merge() can insert new objects and update existing ones. Why would one want to use persist() (which can only create new objects)? 15 s 15 Either way will add an entity to a PersistenceContext, the difference is in what you do with the entity afterwards. Persist takes an entity instance, adds it to the context … Read more

PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate

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This is a typical bidirectional consistency problem. It is well discussed in this link as well as this link. As per the articles in the previous 2 links you need to fix your setters in both sides of the bidirectional relationship. An example setter for the One side is in this link. An example setter … Read more