Are you mixing ORMs?  @OneToOne is JPA and @Embedded is JDO?  Perhaps you can 
combine them; if so, I didn't know that.

Beyond that, try adding it to the default fetch group;

    @Persistent(embedded = "true", defaultFetchGroup = "true")
    public Set<String> getWords()


David Fuelling wrote:
> I have an entity with a List<String> in it as follows:
> 
>       @OneToOne(fetch = FetchType.LAZY)
>       @Embedded
>       public Set<String> getWords()
>       {
>               return words;
>       }
> 
>       public void setWords(Set<String> words)
>       {
>               this.words = words;
>       }
> 
> If I set FetchType to "LAZY" in my code, compile, and then execute a
> finder on this entity, then try to access the "words" collection on
> the returned object, I get the following exception:
> 
> "javax.jdo.JDODetachedFieldAccessException: You have just attempted to
> access property "words" yet this property was not detached when you
> detached the object. Either dont access this property, or detach it
> when detaching the object."
> 
> However, if I set the FetchType to Eager, I can access the "words"
> field.  This seems odd to me, since everything I'm reading in the docs
> and in this group seems to indicate that EAGER fetching requires
> joins, and joins are not supported.
> 
> Should I be using LAZY here, or EAGER?
> 
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