java - JPA Criteria Query, how to join entities - Hibernate- -

i have made jpa project (using hibernate). it's bit more complex this, here 2 classes:

@entity @table(name= "persons") public class person {     @id     @column(nullable= false)     @generatedvalue(strategy = generationtype.auto)     protected integer persid;     @column(nullable= false, length = 50)     private string firstname;     @column(nullable= false, length = 50)     private string surname;     @column(nullable= true, length = 50)     private string emailaddress;      @onetomany(orphanremoval = true, cascade = {cascadetype.remove, cascadetype.merge})     private list<phonenumber> phonenumbers;      @onetoone(mappedby="person", orphanremoval = true, cascade = {cascadetype.remove, cascadetype.merge})     private account account;      //private account account;     public person() {         // empty     }      public person(string firstname, string surname, string emailaddress) {          this.firstname = firstname;         this.surname = surname;         this.emailaddress = emailaddress;     }       public integer getpersid() {         return persid;     }     public string getfirstname() {         return firstname;     }     public void setfirstname(string firstname) {         this.firstname = firstname;     }     public string getsurname() {         return surname;     }     public void setsurname(string surname) {         this.surname = surname;     }     public string getemailaddress() {         return emailaddress;     }     public void setemailaddress(string emailaddress) {         this.emailaddress = emailaddress;     }     //public account getaccount() {     //    return account;     //}     //public void setaccount(account account) {     //    this.account = account;     //}     @override     public string tostring() {         return "person [persid=" + persid + ", firstname=" + firstname + ", surname=" + surname + ", emailaddress=" + emailaddress + "]";     } } 

and

@entity @table(name="phonenumbers") public class phonenumber {     @id     @column(nullable = false)     @generatedvalue(strategy = generationtype.auto)     private integer phoneid;     //@column(nullable= false)     @manytoone     private person person;     @column(nullable=false)     private string phonenumber;      //getsetters      public integer getphoneid() {         return phoneid;     }     public person getperson() {         return person;     }     public string getphonenumber() {         return phonenumber;     }     public void setphonenumber(string phonenumber) {         this.phonenumber = phonenumber;     }      //overrides      @override     public boolean equals(object obj)     {         if (obj instanceof phonenumber) {             string num = ((phonenumber)obj).getphonenumber();             return (num == this.phonenumber);         } else {             return false;         }     }     @override     public int hashcode(){         return phonenumber.hashcode();     }      public phonenumber(person person, string phonenumber){         this.person = person;         this.phonenumber = phonenumber;     } } 

now, i'm trying do, make criteria query, give me person who's telephone number same given string. have written test adding sample data , getting back, can't understand how join works here.

criteriaquery<person> query = personservice.criteriabuilder().createquery(person.class);         root<person> proot = query.from(person.class); join<person, phonenumber> pnumbers = proot.join(person_.phonenumbers); 

is correct line? , if so, do, , how later addres fields in "where" clause? in advance every1!

ps. whole project contains more files- personservice interface, can assume it's uses correct- criteria queries i'm having problem with