Example The Entity class MyEntity int id In following example, we will understand how to use these listener methods in an entity class. This argument type can also be in which case we will receive events for all entities instead of a specific one. This one argument should be the entity type which we are interested in receiving notification for. When these methods used in a dedicated listener class, they take one argument. When these methods used in an entity class they should take no arguments. These methods can be defined in an entity class or in a dedicated listener class. The callback methods can have any names, they should not be static or final and their return type should always be void. Void onPreRemove() after EntityManager.remove() - probably on commit or flush but might be before that Void onPostUpdate() when EntityManager.remove() is called but before DML Delete execution. Void onPreUpdate() after any operation which has executed a DML Update statement for the entity. Void onPostLoad() on any operation which is about to execute a DML Update statement for the entity. Void onPostPersist() //Fired whenever an entity is loaded via SQL Select statements. Void onPrePersist() //Fired after EntityManager.persist() - probably on commit() or flush() but might be before that To define listeners, we can use following method level //Fired when EntityManager.persist() is called but before DML Insert execution. JPA supports user defined entity lifecycle callback methods (listeners), where JPA runtime can send notifications during entities operations.
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