Criteria API fails with EclipseLink JPA provider

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Given some Java code like:

  Criteria criteria = Criteria.forClass(Projet.class);
  criteria.add(Restrictions.eq("campagne.id", idCampagne));

  DAO.findByCriteria(criteria);

Using EclipseLink JPA provider (I updated the pom.xml), I get this error:

java.lang.IllegalArgumentException: An exception occurred while creating a 
query in EntityManager: 
Exception Description: Syntax error parsing the query [select this from Projet 
as this where this.campagne.id=?], line 0, column -1: unexpected end of query.
Internal Exception: NoViableAltException(-1!=[792:1: 
comparisonExpressionRightOperand returns [Object node] : (n= 
arithmeticExpression | n= nonArithmeticScalarExpression | n= anyOrAllExpression 
);])
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1373)
    at com.szczytowski.genericdao.criteria.Criteria.prepareQuery(Criteria.java:333)
    at com.szczytowski.genericdao.criteria.Criteria.list(Criteria.java:236)
    at com.szczytowski.genericdao.impl.GenericDao.findByCriteria(GenericDao.java:319)
[...]

It looks like "select this from Projet as this where this.campagne.id=?" is not 
a valid JPQL query.

AFAIK numbered parameters must be specified with an index, e.g.:
  "select this from Projet as this where this.campagne.id=?1"

Whereas Hibernate HQL doesn't need this index, that's why included tests for 
criteria succeed.

Original issue reported on code.google.com by damiano....@gmail.com on 27 Jan 2011 at 11:24