[jboss-user] [EJB 3.0] - Re: totally weird error: org.hibernate.hql.ast.tree.FromClau

[andydale]

I also had this problem after upgrading to the latest release of Hibernate (3.2.0GA).  I was experiencing the this exception when trying query a single table inheritence structure.

The following query did not work


  | Query tmpQuery = mEntityManager.createQuery("SELECT DISTINCT e.expression FROM TargetEntity " +
  |                 "t INNER JOIN t.expressionTargets e LEFT OUTER JOIN FETCH e.expression.restrictions r " +
  |                 "JOIN FETCH r.expressionTargets f JOIN FETCH f.targetEntity " +
  |                 "WHERE t.id = :pk AND e.expression.class = Rule").setParameter("pk", 1); 
  | 

but the following one did


  | Query tmpQuery = mEntityManager.createQuery("SELECT DISTINCT e.expression FROM TargetEntity " +
  |                 "t INNER JOIN t.expressionTargets e LEFT OUTER JOIN FETCH e.expression.restrictions r " +
  |                 "JOIN FETCH r.expressionTargets f JOIN FETCH f.targetEntity " +
  |                 "WHERE t.id = :pk AND e.expression.class = 'rule'").setParameter("pk", 1); 
  | 

I had to quote the discriminator value in the query, if this was not done it caused a NPE.

Cheers,

Andy

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