Question

I have a class say: “ClassA” which has a collection of “ClassB”

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "COLUMN_NAME")    
private List<ClassB> lotsOfClasses;

“ClassB” has a mapped class “ClassC” using plain old mapping annotations:

public class ClassB {
...
  @ManyToOne
  @JoinColumn(name="AD_POINT_ID")
  private ClassC classC;
...
}

How do I add an @OrderBy annotation to ClassA’s collection to ClassB, so that the collection is ordered by the “name” property of ClassC

Like so:

@OrderBy(clause="classC.name asc")

All I get are Oracle exceptions saying that classC is unknown.

Any help here would be awesome, as its really bugging me at the moment.

P.S. I should also mention that using the OrderBy annotation on the collection like this:
@OrderBy(clause=”classC asc”)
(i.e. without the .name on classC) I get a valid SQL statement, which uses the ID column (the primary key) of classC to order by.

Cheers,
Mark

Answer 1

It’s unfortunately impossible to do what you want. I’ve answered a similar question here.

@OrderBy only supports direct properties of the collection elements.