JPQL Constructor Queries containing Timestamp cause exception
-------------------------------------------------------------

          Key: EJB-384
          URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-384
        Project: Hibernate Entity Manager
      Issue Type: Bug
  Affects Versions: 3.3.1.GA
     Environment: Hibernate 3.3.1.GA, Derby, JDK1.5, Windows.
       Reporter: Bjorn Beskow
       Priority: Minor
     Attachments: hibernate-jpql-timestamp-bug.zip

When a constructor JPQL query projects a Timestamp, it causes an org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor.

For example, given the following Entity:

@Entity
public class Employee {
  ...
  private Timestamp lastUpdatedAsTimestamp;
  ...
}

and the following Pojo for the constructor query:

  public EmployeeDto(String name, Timestamp lastUpdated) {...}

the following query will throw an exception:

   String query =
     "SELECT new test.dto.EmployeeDtoUsingTimestamp(e.name, e.lastUpdatedAsTimestamp) " +
       "FROM Employee e ORDER BY e.name";

   List<EmployeeDto> reportList = em.createQuery(query).getResultList();

java.lang.IllegalArgumentException: org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [test.dto.EmployeeDto] [SELECT new test.dto.EmployeeDto(e.name, e.lastUpdated) FROM test.entities.Employee e ORDER BY e.name]
 at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException (AbstractEntityManagerImpl.java:601)
 at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery (AbstractEntityManagerImpl.java:96)
 at test.ConstructorQueryTest.testEmployeesQuery(ConstructorQueryTest.java:63)
  ...

This problem has been reported before (see HHH-278), but the workaround is not a portable JPA solution (having the type Timestamp in the Entity and the type Date in the Pojo constructor is not in line with the Spec, and does not work in other JPA implementations).

I have attached a minimal Maven project with a test case which highlights the problem.


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