java - [Ljava.lang.Object; cannot be cast to error -

i list query.list(). after that, want display object inside list got error line for(commerce[] c: this.newslist) {

java.lang.classcastexception: [ljava.lang.object; cannot cast [lcom.model.commerce; com.action.commerceaction.searchcommerces(commerceaction.java:35)

here code:

my business service

public list<commerce[]> getcommercesbysearch(string categorie, string lieux) {     query query = hibutil.getsession().createquery("from commerce c, categorie ca,lieux l "             + "where c.categorie=ca.idcategorie , c.lieux=l.idlieux and"             + " ca.libelle='" + categorie + "' , l.ville='" + lieux + "' ");     list<commerce[]> tuples = (list<commerce[]>) query.list();     return tuples; } 

my action class

private commerceservice service; private commerce commerce = new commerce(); private list<commerce[]> newslist; public string searchcommerces() {     string libelle = servletactioncontext.getrequest().getparameter("libelle");     string ville = servletactioncontext.getrequest().getparameter("ville");     this.newslist = service.getcommercesbysearch(libelle,ville);     for(commerce[] c: this.newslist){         system.out.println(c[0].getnom());     }     if (this.newslist.size() > 0) {         return success;     }     addactionerror("il n'existe aucun commerce de cette catégorie dans cette ville");        return error;     } 

i statement:

list<commerce[]> tuples = (list<commerce[]>) query.list(); 

produces unchecked type conversion warning. your code polluting heap doing unchecked type conversion. query.list() returns raw list, contain object[]. here relevant hibernate documentation:

return query results list. if query contains multiple results per row, results returned in instance of object[].

note cannot cast array array of it's sub-type.

there couple of ways fix problem:

1. use list<object[]> instead of list<commerce[]>. can transform result of list() method more usable form, preferably within it's own method, before passing on rest of code. preferable method if need select more commerce object.
2. add select c beginning of query, allow safe list<commerce> cast.