Why cannot a JPA mapping attribute be a LinkedHashset?

Question

Motivated by this question, I\'ve tried to change the following:

 @ManyToMany(cascade={CascadeType.REMOVE, CascadeType.MERGE})
private Set exps         


        

Answer 1

Only the standard interfaces types are allowed as attribute types in JPA. Why are you changing the type of the attribute? With the original definition the underlying collection is still your custom type.