java - Eclipse 'generate entities from tables' and 'many to one' relation -

i developing simple java ee application, uses database. has 2 tables (admin , session signature) connected many 1 relation.

when used eclipse generate entities tables, attribute links both tables generated this:

//bi-directional many-to-one association admin @manytoone @joincolumn(name="owner") private admin admin; 

problem is, owner attribute integer in database, , has been created admin type.

now when want pass integer variable input database error:

the method setadmin(admin) in type signaturesession not applicable arguments (int). 

or when want cast (admin) (taking session):

(admin)session.getattribute("adminid") 

i jboss error:

javax.servlet.servletexception: java.lang.classcastexception: java.lang.integer cannot cast com.podpisy.entities.admin javax.faces.webapp.facesservlet.service(facesservlet.java:606) secure.securitycheckfilter.dofilter(securitycheckfilter.java:100) 

i sure can done easy, i'm bad using java.

thanks help.

edit:

my admin.java class:

package com.podpisy.entities;  import java.io.serializable; import javax.persistence.*; import java.util.list;   @entity @table(name="admins") @namedquery(name="admin.findall", query="select admin a") public class admin implements serializable {     private static final long serialversionuid = 1l;      @id     private int id;      private string login;      private string password;      //bi-directional many-to-one association signature     @onetomany(mappedby="admin")     private list<signature> signatures;      //bi-directional many-to-one association signaturesession     @onetomany(mappedby="admin")     private list<signaturesession> signaturesessions;      public admin() {     }      public int getid() {         return this.id;     }      public void setid(int id) {         this.id = id;     }      public string getlogin() {         return this.login;     }      public void setlogin(string login) {         this.login = login;     }      public string getpassword() {         return this.password;     }      public void setpassword(string password) {         this.password = password;     }      public list<signature> getsignatures() {         return this.signatures;     }      public void setsignatures(list<signature> signatures) {         this.signatures = signatures;     }      public signature addsignature(signature signature) {         getsignatures().add(signature);         signature.setadmin(this);          return signature;     }      public signature removesignature(signature signature) {         getsignatures().remove(signature);         signature.setadmin(null);          return signature;     }      public list<signaturesession> getsignaturesessions() {         return this.signaturesessions;     }      public void setsignaturesessions(list<signaturesession> signaturesessions) {         this.signaturesessions = signaturesessions;     }      public signaturesession addsignaturesession(signaturesession signaturesession) {         getsignaturesessions().add(signaturesession);         signaturesession.setadmin(this);          return signaturesession;     }      public signaturesession removesignaturesession(signaturesession signaturesession) {         getsignaturesessions().remove(signaturesession);         signaturesession.setadmin(null);          return signaturesession;     }  } 

my signaturesession.class:

package com.podpisy.entities;  import java.io.serializable;  import javax.persistence.*;   /**  * persistent class signaturesession database table.  *   */ @entity @namedquery(name="signaturesession.findall", query="select s signaturesession s") public class signaturesession implements serializable {     private static final long serialversionuid = 1l;      @id     private int id;      private string device;      private string name;      private int signatures;      private int time;      private string type;      private int users;      //bi-directional many-to-one association admin     @manytoone     @joincolumn(name="owner")     private admin admin;      public signaturesession() {     }      public int getid() {         return this.id;     }      public void setid(int id) {         this.id = id;     }      public string getdevice() {         return this.device;     }      public void setdevice(string device) {         this.device = device;     }      public string getname() {         return this.name;     }      public void setname(string name) {         this.name = name;     }      public int getsignatures() {         return this.signatures;     }      public void setsignatures(int signatures) {         this.signatures = signatures;     }      public int gettime() {         return this.time;     }      public void settime(int time) {         this.time = time;     }      public string gettype() {         return this.type;     }      public void settype(string type) {         this.type = type;     }      public int getusers() {         return this.users;     }      public void setusers(int users) {         this.users = users;     }      public admin getadmin() {         return this.admin;     }      public void setadmin(admin admin) {         this.admin = admin;     }  } 

you should pass admin object surely has int id field.

so you've make this

  admin myadmin=new admin(id,.. other properties);   mysignaturesession.setadmin(myadmin);  

edit

above valid if want associate , admin signaturesession object. instead if have admin ojbect in session have execute

       admin anadmin=(admin)session.getattibute("adminid");        admin myadmin=new admin(id,.. other properties); 

or admin myadmin=new admin(); myadmin.setid(anid);

but, repeat, depends have in session , objects handle. and, using jpa, dont forget em.persist or em.merge on objects. maybe should little deeper on how jpa works.