from EdvPersona p
where 0 < ( select count(c) from EdvCurso as c inner join c.cuMateria as m where c.cuProfesor.peId = p.peId and m.maTitulo like ? )

DetachedCriteria p = DetachedCriteria.forClass( EdvPersona.class, "p"  );
DetachedCriteria c = DetachedCriteria.forClass( EdvCurso.class, "c" );
c.setFetchMode( "cuMateria", FetchMode.JOIN );
c.setProjection( Projections.rowCount() );
DetachedCriteria m = c.createCriteria( "cuMateria", "m" )
       .add( Restrictions.like( "m.maTitulo", "something%" ) );
c.add( Property.forName( "c.cuProfesor.peId" ).eqProperty( "p.peId" ) );
p.add( Subqueries.lt( 0, c ) );
List l = getHibernateTemplate().findByCriteria( p );

org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: null; nested exception is org.hibernate.MappingException: Unknown entity: null
Caused by: org.hibernate.MappingException: Unknown entity: null
        at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:548)
   at org.hibernate.loader.criteria.CriteriaQueryTranslator.getPropertyMapping(CriteriaQueryTranslator.java:518)
        at org.hibernate.loader.criteria.CriteriaQueryTranslator.getType(CriteriaQueryTranslator.java:477)
        at org.hibernate.loader.criteria.CriteriaQueryTranslator.getTypeUsingProjection(CriteriaQueryTranslator.java:459)
        at org.hibernate.loader.criteria.CriteriaQueryTranslator.getTypedValue(CriteriaQueryTranslator.java:509)
        at org.hibernate.criterion.SimpleExpression.getTypedValues(SimpleExpression.java:71)
        at org.hibernate.loader.criteria.CriteriaQueryTranslator.getQueryParameters(CriteriaQueryTranslator.java:251)
        at org.hibernate.criterion.SubqueryExpression.toSqlString(SubqueryExpression.java:57)
        at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:334)
        at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:82)
        at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:68)
        at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1550)
        at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
        at org.springframework.orm.hibernate3.HibernateTemplate$35.doInHibernate(HibernateTemplate.java:974)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:362)
        at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:964)
        at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:957)