How do I get id of merged JPA entity

I have a little application where I store entity to DB. I do this in next way:

class Entity {
    privete id;
    String somePropertie;
    // getters and setters
}
// In main class
Entity newEntity = new Entity();
newEntity.setSomePropertie("somePropertie");
Entity entity = entityManager.merge(newEntity);
System.out.println("This is id of 开发者_如何学Cstored entity:", entity.getId())

The didn't write the jpa annotations here. But the entity is stored to database, but the printed id is 0; I using transaction driven by spring, I need this entity for later updates of the entity id.

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EntityManager.merge(..) gets an instance and returns an instance that is managed. And in case of transient instances it returns a new instance (does not modify the original)

So your mergeEntity(..) method should return em.merge(entity)

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Correct me if I am wrong, but have you tried with

Entity entity = entityManager.merge(newEntity);
System.out.println("This is id of stored entity:", entity.getId())

in the same transaction?

Also try setting id to Long rather than long (or Integer rather than int; it is not clear from your definition)