Skip to main content

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
[eclipselink-users] loading collection problem


Thanks for the answer on my previous question. That works well!

But now I have another problem.
I want to load an object with a collection that may be empty.

For example my Lamp object has a @ManyToMany relation with Gear.

public class Lamp extends Product {

@JoinTable(name="PLI_LAMP_GEAR", joinColumns = @JoinColumn(name="lamp_id", referencedColumnName = "ID"), inverseJoinColumns = @JoinColumn(name="gear_id", referencedColumnName = "ID"))
   private List<Gear> gears = new ArrayList<Gear>()


public class Gear extends Product {

In my situation, the Lamp has no Gears, so the join table is empty for this lamp.

But when I try to load the Lamp it returns nothing. I want it to return a Lamp (with name, description etc) and an empty collection of Gears.

This is my named query: "select l from Lamp l left join fetch l.gears where = :lampId"

I tried several queries, but always get the message: "javax.persistence.NoResultException: getSingleResult() did not retrieve any entities."

Am I doing something wrong?


Back to the top