Marc Prud'hommeaux reopened OPENJPA-208:

>From Abe on mailing list: That breaks the single result optimization that was 
>added for  OPENJPA-168 when getSingleResult() is called.  There was a reason 
>we moved the validation to the kernel.  The previous code was correct. You 
>need to use the "hard" way of creating new exception types.

> NoResultException and NonUniqueResultException are not thrown when expected
> ---------------------------------------------------------------------------
>                 Key: OPENJPA-208
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-208
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>    Affects Versions: 0.9.6
>            Reporter: Marc Prud'hommeaux
>         Assigned To: Marc Prud'hommeaux
>             Fix For: 0.9.7
> When calling Query.getSingleResult() on a query that either has no result or 
> multiple results, either a NoResultException and NonUniqueResultException 
> (respectively) should be thrown in accordance with section 3.6.1 of the JPA 
> spec. Instead, we appear to throw a 
> org.apache.openjpa.persistence.InvalidStateException:
> org.apache.openjpa.persistence.InvalidStateException: The query on candidate 
> type "class com.sun.ts.tests.ejb30.persistence.query.apitests.Department" 
> with filter "select d.name from Department d where d.id > 1" was configured 
> to have a unique result, but more than one instance matched the query.
>      at org.apache.openjpa.kernel.QueryImpl.singleResult(QueryImpl.java:1282)
>      at org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1207)
>      at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:982)
>      at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:791)
>      at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:761)
>      at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:757)
>      at 
> org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:514)
>      at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:225)
>      at 
> org.apache.openjpa.persistence.QueryImpl.getSingleResult(QueryImpl.java:287)

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