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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