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EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1819241]

Fri, 10 January 2020 11:50

Eclipse User

Hello,

I ported a webapp to EclipseLink and on init of the queries the persistence provider fails on the query:

aused by: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.7.5.v20191016-ea124dd158): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing [
            SELECT NEW net.bbstats.dto.PlayerStatDto(
              gl.playerId,
              gl.seasonStartYear,
              gl.lastName,
              gl.firstName,
              gl.incognito,
              COUNT(DISTINCT gl.gameId) AS games,
              SUM(CASE WHEN gl.hasPlayed = FALSE THEN 1 ELSE 0 END) AS gamesplayed,
              SUM(CASE WHEN gl.starter = TRUE THEN 1 ELSE 0 END) AS gamesstarted,
              SUM(gl.threePointersMade),
              SUM(gl.freeThrowsMade),
              SUM(gl.freeThrowsAttempted),
              SUM(gl.personalFouls),
              SUM(CASE WHEN gl.personalFouls >= 5 THEN 1 ELSE 0 END),
              SUM(gl.points) AS points,
              MAX(gl.points),
              MIN(gl.points)
            )
            FROM GameLog gl
            WHERE gl.roundId = :roundId AND gl.groupCode = :groupCode AND gl.rosterId IN :rosterIds
            GROUP BY
              gl.playerId,
              gl.seasonStartYear,
              gl.lastName,
              gl.firstName,
              gl.incognito
            ORDER BY gamesstarted DESC, games DESC, points DESC, gl.lastName, gl.firstName
        ]. 
[140, 141] The constructor expression has two constructor items ('COUNT(DISTINCT gl.gameId)' and 'AS games') that are not separated by a comma.
[204, 205] The constructor expression has two constructor items ('SUM(CASE WHEN gl.hasPlayed = FALSE THEN 1 ELSE 0 END)' and 'AS gamesplayed') that are not separated by a comma.
[271, 272] The constructor expression has two constructor items ('SUM(CASE WHEN gl.starter = TRUE THEN 1 ELSE 0 END)' and 'AS gamesstarted') that are not separated by a comma.
[462, 463] The constructor expression has two constructor items ('SUM(gl.points)' and 'AS points') that are not separated by a comma.
[141, 149]  The expression is invalid, which means it does not follow the JPQL grammar.
[205, 219]  The expression is invalid, which means it does not follow the JPQL grammar.
[272, 287]  The expression is invalid, which means it does not follow the JPQL grammar.
[463, 472]  The expression is invalid, which means it does not follow the JPQL grammar.
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildException(HermesParser.java:157)
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.validate(HermesParser.java:336)
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.populateQueryImp(HermesParser.java:280)
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildQuery(HermesParser.java:165)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:142)
    at org.eclipse.persistence.internal.jpa.JPAQuery.processJPQLQuery(JPAQuery.java:225)
    at org.eclipse.persistence.internal.jpa.JPAQuery.prepare(JPAQuery.java:186)
    at org.eclipse.persistence.queries.DatabaseQuery.prepareInternal(DatabaseQuery.java:631)
    at org.eclipse.persistence.internal.sessions.AbstractSession.processJPAQuery(AbstractSession.java:4502)
    at org.eclipse.persistence.internal.sessions.AbstractSession.processJPAQueries(AbstractSession.java:4462)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:645)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:868)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:811)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:256)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:772)
    ... 201 more

Is this expected behavior? I think it is not very clever to disallow `AS` in constructor expressions...

I have also posted a question on SO here:

https://stackoverflow.com/questions/59677453/eclipselink-throws-jpqlexception-on-using-select-as-in-a-constructor-express

I would very much appreciate if someone could have a look at this and state his/her opinion.

Is this a missing feature? Is it just normal behavior because JPA doesn't specify it?

Thanks
Karsten

[Updated on: Fri, 10 January 2020 11:59] by Moderator

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Re: EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1819464 is a reply to message #1819241]

Thu, 16 January 2020 00:18

Eclipse User

No one?

It looks like a missing feature to me.

[Updated on: Thu, 16 January 2020 00:18] by Moderator

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Re: EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1820557 is a reply to message #1819464]

Wed, 22 January 2020 18:41

Eclipse User

I'd agree with your line of thinking that this is a missing feature. Other then the potential complexity of the parser, there is no reason I can see support for it couldn't be added, but not truly a bug as it isn't required by the spec or anywhere else for that matter.

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Re: EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1820600 is a reply to message #1820557]

Thu, 23 January 2020 16:56

Eclipse User

Chris,

thanks for your reply.

I'd like to propose two features for the JPA spec then (I have got another one).

Can you tell me where/who to direct these proposals to?

Thanks
Karsten

[Updated on: Thu, 23 January 2020 17:10] by Moderator

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Re: EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1820974 is a reply to message #1820600]

Mon, 03 February 2020 17:58

Eclipse User

I've not looked recently, but all JPA specification contact information should be available on the https://www.jcp.org/en/jsr/detail?id=220 page.

Please feel free to file enhancement requests within EclipseLink - no reason they can't be implemented here if there is interest, which might add weight for their inclusion in future specifications.

Best Regards,
Chris

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Re: EclipseLink throws JPQLException on using SELECT ... AS in a constructor expression [message #1822214 is a reply to message #1820974]

Sun, 01 March 2020 12:34

Eclipse User

Hmm. The link you posted is really old.

Quote:

Section 1. Identification

Submitting Member: Sun Microsystems, Inc

Name of Contact Person: Linda DeMichiel

E-Mail Address: linda.demichiel@sun.com

Telephone Number: +1 408 276 7057

Fax Number: +1 408 276 7191

Specification Lead: Linda DeMichiel

E-Mail Address: linda.demichiel@sun.com

Telephone Number: +1 408 276 7057

Fax Number: +1 408 276 7191

Sun.com e-mail-addresses?

Nope.

Do you have any current contacts? I already guessed e-mail-addresses of Linda DeMichiel and Mike Keith, who I had contact with in the past, and I know the latter one had an oracle.com e-mail-address.

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