spring - nullpointerexception while using if condition -

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im using hibernate criteria spring(both annotation) im having nullpointerexception service class :

    public list<voiture> rechercher_voiture(string type, string couleur,          string lieulocation) {     list<voiture> v = new arraylist<voiture>();     criteria crit;     session session = dao.getsessionfactory().getcurrentsession();       crit = session.createcriteria(voiture.class)             .add(restrictions.eq("type", type))             .add(restrictions.eq("lieulocation", lieulocation))             .add(restrictions.eq("statut", (long) 0));           if(couleur.isempty()==false) {             crit.add(restrictions.eq("couleur", couleur));         } v = crit.list();      return v; }

the nullpointerexception caused if condition suggestion?

it happens if couleur = null. change if(couleur!=null && couleur.isempty()==false)


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