jpa - Using COUNT in JPQL Query -

i have following jpql query:

    list<destinationinfo> destinations = em.createquery("select new com.realdolmen.patuva.dto.destinationinfo(d.name, d.continent, min(t.departuredate), min(t.priceperday), count(t.id))" +             " destination d, trip t" +             " d.continent = :continent " +             " group d.name, d.continent").setparameter("continent", searchedcontinent).getresultlist(); 

if run error:

javax.ejb.ejbtransactionrolledbackexception: org.hibernate.hql.internal.ast.querysyntaxexception: unable locate appropriate constructor on class [com.realdolmen.patuva.dto.destinationslist] 

if leave out count(t.id) , remove parameter destinationinfo constructor works fine. why can't map count(t.id) destinationinfo dto.

this destinationinfo class:

public class destinationinfo {     private string name;     private continent continent;     private date earliestdeparture;     private integer totalnumtrips;     private bigdecimal lowestprice;      public destinationinfo(string name, continent continent, date earliestdeparture, bigdecimal lowestprice, integer totalnumtrips) {         this.name = name;         this.continent = continent;         this.earliestdeparture = earliestdeparture;         this.totalnumtrips = totalnumtrips;         this.lowestprice = lowestprice;     }      // getters , setters } 

apparently count(t.id) returns number of type long. changing destinationinfo class following makes work:

public class destinationinfo {     private string name;     private continent continent;     private date earliestdeparture;     private long totalnumtrips;     private bigdecimal lowestprice;      public destinationinfo(string name, continent continent, date earliestdeparture, bigdecimal lowestprice, long totalnumtrips) {         this.name = name;         this.continent = continent;         this.earliestdeparture = earliestdeparture;         this.totalnumtrips = totalnumtrips;         this.lowestprice = lowestprice;     }      // getters , setters }