delete twice triggers detached entity error, but change to composite primary key and the exception is gone. ----------------------------------------------------------------------------------------------------------- Key: EJB-313 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-313 Project: Hibernate Entity Manager Issue Type: Bug Affects Versions: 3.2.0.cr3 Environment: Windows XP Professional + Postgres 8.1 + Spring 2 + JPA + Hibernate 3.2.3 Reporter: Simon Ng Attachments: DeleteTwice.zip The attached file DeleteTwice.zip has the entire project; and the primary key is a composite primary key. Run the unit test and there is no exception, just an INFO level message of "handling transient entity in delete processing". Next, delete RestaurantPK.java, and change Restaurant.java to use a simple primary key: package blog.jpa.domain; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; import javax.persistence.OneToOne; @Entity public class Restaurant { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } Change the onSetUpInTransaction to use different SQL statement to reflect a different table protected void onSetUpInTransaction() throws Exception { jdbcTemplate.execute("insert into restaurant (id, name) values (1, 'Burger Barn')"); jdbcTemplate.execute("insert into restaurant (id, name) values (2, 'Veggie Village')"); jdbcTemplate.execute("insert into restaurant (id, name) values (3, 'Dover Diner')"); } drop the table restaurant and run the unit test again. Now there is an exception [junit] Testcase: testDeleteRestaurant(blog.jpa.dao.JpaRestaurantDaoTests): Caused an ERROR [junit] Removing a detached instance blog.jpa.domain.Restaurant#3; nested exception is java.lang.IllegalArgumentExce ption: Removing a detached instance blog.jpa.domain.Restaurant#3 [junit] org.springframework.dao.InvalidDataAccessApiUsageException: Removing a detached instance blog.jpa.domain.Res taurant#3; nested exception is java.lang.IllegalArgumentException: Removing a detached instance blog.jpa.domain.Restaura nt#3 [junit] Caused by: java.lang.IllegalArgumentException: Removing a detached instance blog.jpa.domain.Restaurant#3 [junit] at org.hibernate.ejb.event.EJB3DeleteEventListener.performDetachedEntityDeletionCheck(EJB3DeleteEventLis tener.java:45) The java.lang.IllegalArgumentException is specified in the JPA spec. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira