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From "Jacek Laskowski (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-212) Constructor expression permits no other expressions in SELECT clause
Date Tue, 10 Apr 2007 14:05:32 GMT
Constructor expression permits no other expressions in SELECT clause
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                 Key: OPENJPA-212
                 URL: https://issues.apache.org/jira/browse/OPENJPA-212
             Project: OpenJPA
          Issue Type: Bug
          Components: query
    Affects Versions: 0.9.7
            Reporter: Jacek Laskowski


It seems that it's impossible to run a query with constructor expression beside other expressions
in SELECT clause. Take a look at the following test that finishes with ClassCastException
when the first element of resultQuery is returned (the 2nd line of the snippet).  Am I doing
something plain wrong?

It doesn't work with Hibernate EntityManager 3.3.1, either yet TopLink Essentials 2.0 BUILD
40 runs fine.

  Query query = em.createQuery("SELECT NEW pl.jaceklaskowski.jpa.PewnaKlasa(p.nazwa, o.imie,
o.nazwisko, o.numer), o, p.nazwa FROM Projekt p JOIN p.chair o");
  List<Object[]> resultQuery = query.getResultList();
  final Object[] firstElementInQueryResult = resultQuery.get(0);
  assert firstElementInQueryResult.length == 3;
  final Object firstElement = resultQuery.get(0)[0];
  assert firstElement instanceof PewnaKlasa;
  final Object secondElement = resultQuery.get(0)[1];
  assert secondElement instanceof Osoba;
  final Object thirdElement = resultQuery.get(0)[2];
  assert thirdElement instanceof String;

The exception is as follows (the line number is different though as the test above is incomplete
- no class, imports and alike are shown):

java.lang.ClassCastException: pl.jaceklaskowski.jpa.PewnaKlasa
        at pl.jaceklaskowski.jpa.OpenJPATest.testConstructorExpr(OpenJPATest.java:19)

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