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Re: [eclipselink-users] join fetch fails with "DotNode cannot be cast to VariableNode"
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I read single_valued_embeddable_object_field as a field representing an embeddable.
-Tom
Cronemberger, Constantino wrote:
Hi Tom,
Thanks for your replies.
In the spec (persistence-2_0-final-spec.pdf) we have:
fetch_join ::= [ LEFT [OUTER] | INNER ] JOIN FETCH join_association_path_expression
join_association_path_expression ::= join_collection_valued_path_expression | join_single_valued_path_expression
join_single_valued_path_expression ::= identification_variable.{single_valued_embeddable_object_field.}*single_valued_object_field
The funny thing is that I did not find the definition of "single_valued_embeddable_object_field" in the spec.
Regards,
Constantino.
________________________________
------------------------------
Message: 2
Date: Mon, 06 Dec 2010 10:30:18 -0500
From: Tom Ware <tom.ware@xxxxxxxxxx>
To: EclipseLink User Discussions <eclipselink-users@xxxxxxxxxxx>
Subject: Re: [eclipselink-users] join fetch fails with "DotNode cannot
be cast to VariableNode"
Message-ID: <4CFD018A.40409@xxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Constantino,
My reading of the JPA specification is that a multi-level fetch is not
allowed in JPQL.
I believe the bug here is that we are not throwing an exception that tells
you this.
Our fetch join hint was added to cover this case.
-Tom
Cronemberger, Constantino wrote:
Hi,
I have these mappings:
In TestClassA:
@OneToOne(fetch = FetchType.LAZY)
public TestClassB getObjectBLocalFk() {
return objectBLocalFk;
}
In TestClassB:
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name="objectALocal_Fk")
public TestClassA getObjectALocalFk() {
return objectALocalFk;
}
In this example both relationships are one-to-one but with other types it also happens.
I have tested the suggested workaround and it worked.
Thanks,
Constantino.
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