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https://issues.apache.org/jira/browse/JDO-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17894032#comment-17894032
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Craig L Russell commented on JDO-842:
-------------------------------------
Changes are in github repositories:
[https://github.com/clr-apache/jdo-specification/tree/JDO-842]
[https://github.com/apache/db-jdo/blob/JDO-842/api/src/main/java/javax/jdo/JDOQLTypedQuery.java]
> Q class specification of candidate() method
> -------------------------------------------
>
> Key: JDO-842
> URL: https://issues.apache.org/jira/browse/JDO-842
> Project: JDO
> Issue Type: Bug
> Components: specification
> Affects Versions: JDO 3.2.1
> Reporter: Tilmann Zäschke
> Priority: Major
>
> The specification does not clearly specify the behavior of the Q classes in
> Section "14.10 Typesafe Query Construction"
> The examples in section "14.11 Examples" use the following methods of
> generated Q-classes:
> * candidate()
> * candidate(String)
> * variable(String)
> Both candidate methods are used in the query examples, but they are not
> specified as part of the typesafe query support.
> Specific points that we should possibly mention:
> * These methods should allow Q classes to be used concurrently.
> Specifically, they should all return *new* instances. The current
> specification allows returning shared multiple instances which causes
> problems when used concurrently. (the reference implementation currently does
> this for 'candidate()').
> * The reference implementation also has a 'parameter(String)' method. We may
> want to add this to the spec.
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