[hibernate-issues] [Hibernate-JIRA] Created: (EJB-384) JPQL Constructor Queries containing Timestamp cause exception
JPQL Constructor Queries containing Timestamp cause exception
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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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