According to the Hibernate manual, it is possible to use public static final constants directly in HQL queries. Why then can I not use enums there as well? I tried | SELECT DISTINCT m FROM Material m, IN(m.suppliers) s WHERE m.unit <> Material.MaterialUnit.SQUARE_METRES AND s.id = :id | and variations like "MaterialUnit.SQUARE_METRES" and the fully qualified name, but they all produce the same error message on deployment: anonymous wrote : | 13:55:36,982 ERROR [SessionFactoryImpl] Error in named query: Material.nonCuttables | org.hibernate.hql.ast.QuerySyntaxException: Invalid path: 'null.MaterialUnit.SQUARE_METRES' [SELECT DISTINCT m FROM fi.karico.etikettu.domain.Material m, IN(m.suppliers) s WHERE m.unit <> Material.MaterialUnit.SQUARE_METRES AND s.id = :id] | The same works fine if I just input the enum as a parameter: | SELECT DISTINCT m FROM Material m, IN(m.suppliers) s WHERE m.unit <> :m2unit AND s.id = :id | What am I doing wrong? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4020510#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...