toplink-essentials

I have a long-running method which executes a large number of native SQL queries through the EntityManager (TopLink Essentials). Each query takes only milliseconds to run, but there are many thousands of them. This happens within a single EJB transaction. After 15 minutes, the database closes the connection which results in following error: Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.1 (Build b02-p04 (04/12/2010))): oracle.toplink.essentials.exceptions.DatabaseException Internal Exception: java.sql.SQLException: Closed Connection Error Code: 17008 Call: select ... Query:

I add entity to my database and it works fine. But when i retrieve the List, i get the old entity, the new entities i add are not shown until i undeploy the application and redeploy it again. This means are my entities cached by default? But, I haven't made any settings for caching entities in my persistence.xml or any such file. I have even tried calling flush(), refresh() and merge(). But still it shows the old entities only. Am i missing something? Please help me. Welcome to JPA. If you use it, it means you will have huge problems if you update the database outside of JPA unless you know

I've got an integration test of a DAO in which I use a shared EntityManager (via Spring, using SharedEntityManagerCreator). The test class is marked as @Transactional, as is the DAO method under test. In both the test class and the DAO I'm retreiving a User entity as follows: User user = em.find(User.class, "test"); In the setup of my test I've modified the user object, but I wasn't seeing the modification in the DAO when the test came to run. It turned out that the two references did not refer to the same object; I proved this in my test class using: System.out.println("User objects equal = "

I have 1 entity call Item in which I want to be able to link parent items to children. to use a join table to create a parent/child relationship. I haven't been able to get any good documentation on. So if anyone has any thoughts I'm all ears. Here is what I have... which works most of the time. public class Item implements java.io.Serializable { @Id private Long id; @ManyToOne(optional = true, fetch = FetchType.LAZY) @JoinTable(name = "ITEMTOITEM", joinColumns = { @JoinColumn(name = "ITEMID") }, inverseJoinColumns = { @JoinColumn(name = "PARENTITEMID") } ) private Item parent; @OneToMany