[hibernate-issues] [Hibernate-JIRA] Created: (JPA-10) JPA Criteria API Typesafety on equal

[Sebastian Braun (JIRA)]

JPA Criteria API Typesafety on equal
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                 Key: JPA-10
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/JPA-10
             Project: Java Persistence API
          Issue Type: Bug
    Affects Versions: 1.0.0
         Environment: Java 1.6.0_18
Hibernate 3.5.1-Final
            Reporter: Sebastian Braun
         Attachments: Example.zip

By Using the Typesafe JPA Criteria API  i _dont_ get a Compile Error by compiling the code below:

EntityManagerFactory emf = Persistence.createEntityManagerFactory("hibernatetest");
EntityManager em = emf.createEntityManager();
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Employee> c = cb.createQuery(Employee.class);
Root<Employee> root = c.from(Employee.class)

// No Compile Error, but Exception on Runtime, because "name" is a String and the check parameter is an Integer
Predicate condition = cb.equal(root.get(Employee_.name), 1);

Obviously thats because the method in CriteriaBuilderImpl takes an Object as the second argument:

public Predicate equal(Expression<?> x, Object y) {...}

If this method would look like this the code above will show the correct Compile error

public <T> Predicate equal(Expression<T> x, T y) {...}

Corresponding Example Project is attached.


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