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https://issues.apache.org/jira/browse/OPENJPA-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435859#comment-13435859
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Vermeulen commented on OPENJPA-2251:
------------------------------------
I just noticed that OPENJPA-658 is not resolved yet. Perhaps this is another
manifestation of that issue.
> EXISTS with subquery from superclass generates SQL with syntax error
> --------------------------------------------------------------------
>
> Key: OPENJPA-2251
> URL: https://issues.apache.org/jira/browse/OPENJPA-2251
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Vermeulen
>
> I have an abstract entity Booking with @Inheritance(strategy =
> InheritanceType.TABLE_PER_CLASS).
> It has a ManyToOne relation with Event.
> The following JPQL query generates SQL with a syntax error:
> SELECT z FROM Event z WHERE EXISTS (
> SELECT booking.id FROM Booking booking
> WHERE booking.event = z AND booking.remarks = :REMARKS
> )
> org.apache.openjpa.lib.jdbc.ReportingSQLException: Incorrect syntax near the
> keyword 'FROM'. {prepstmnt 17234903
> SELECT t0.id, ...(many more columns)..., t0.USERCREATED_ID
> FROM booking_Event t0 LEFT OUTER JOIN booking_OccasionType t1 ON
> t0.OCCASIONTYPE_ID = t1.id WHERE (EXISTS (SELECT FROM WHERE ( AND )))}
> [code=156, state=S0001]
> When I replace Booking with the name of a concrete subclass the query
> executes fine.
> When I execute only the subquery as a normal query it executes fine:
> SELECT booking.id FROM Booking booking
> WHERE booking.event.id = :eventId AND booking.remarks = :REMARKS
>
> When I replace the parameter :REMARKS with a Collection-valued parameter like
> so "booking.remarks IN :REMARKS", I get a weird
> ClassCastException:
> Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to
> [Ljava.lang.Object;
> at
> org.apache.openjpa.jdbc.kernel.exps.InExpression.orContains(InExpression.java:178)
> at
> org.apache.openjpa.jdbc.kernel.exps.InExpression.appendTo(InExpression.java:122),
> ....
> Again when I replace Booking with the name of a concrete subclass the query
> executes fine.
> I think this may be related to OPENJPA-681 and OPENJPA-658 which have already
> been resolved, but perhaps the problem still exists when querying on a
> superclass.
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