String hql = "from FoobarDTO "
        + "where projectId = :parentId "
        + "and alphaId = :alphaId "
        + "and kind = :kind and deleteStatus = 0";
Query query = HibernateUtil.getCurrentSession().createQuery(hql);
query.setString("alphaId", alphaId);
query.setInteger("parentId", parentId);
query.setEntity("kind", kind); // kind is a var of enum type Foobar.Kind
FoobarDTO dto = (FoobarDTO) query.uniqueResult();

<hibernate-mapping>
...
   <property name="kind" type="com.mycompany.constants.Foobar$KindUserType">
      <meta attribute="property-type">com.mycompany.constants.Foobar.Kind</meta>
   </property>
...

org.hibernate.MappingException: Unknown entity: com.mycompany.constants.Foobar$Kind
  at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
  at org.hibernate.impl.SessionFactoryImpl.getIdentifierType(SessionFactoryImpl.java:637)
  at org.hibernate.type.EntityType.getIdentifierType(EntityType.java:487)
  at org.hibernate.type.EntityType.getIdentifierOrUniqueKeyType(EntityType.java:512)
  at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:87)
  at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:38)
  at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:491)
  at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1563)
  at org.hibernate.loader.Loader.doQuery(Loader.java:673)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
  at org.hibernate.loader.Loader.doList(Loader.java:2220)
  at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
  at org.hibernate.loader.Loader.list(Loader.java:2099)
  at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
  at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
  at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
  at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
  at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
  at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
  at com.mycompany.FoobarService.findByAlphaId(FoobarService.java:160)

Query query = HibernateUtil.getCurrentSession().createQuery(hql);
query.setString("alphaId", alphaId);
query.setInteger("parentId", parentId);
query.setInteger("kind", kind.getIntValue());