I 'm trying to make a crud in Strud2 with hibernate and I can not combine two tables. Can you help me
Table 1 is Trama



@Entity
@Table(name="trama", catalog="bd_1")

public class Trama implements java.io.Serializable {

private int traNoca; //Int
private int catNoca; //Enlace con categoria
private String tradat; //Dato sin importancia

public Trama() {}

public Trama(int traNoca, int catNoca, String tradat)
{this.traNoca = traNoca; this.catNoca = catNoca; this.tradat = tradat; }

@Id
@Column(name="tra_noca", nullable=false)
public int getTraNoca() {return this.traNoca;} ES
public void setTraNoca(int traNoca) {this.traNoca = traNoca; }

@Column(name="cat_noca", nullable=false)
public int getCatNoca() {return this.catNoca;}
public void setCatNoca(int catNoca) {this.catNoca = catNoca;}

@Column(name="tra_dat", nullable=false, length=45)
public String getTradat() {return this.tradat;}
public void setTradat(String tradat) { this.tradat = tradat; }
}


This is His mapping

<hibernate-mapping>
<class name="entidad.Trama" table="trama" catalog="bd_1">
<id name="TraNoca" type="int">
<column name="tra_noca" />
<generator class="assigned"></generator>
</id>
<property name="CatNoca" type="int">
<column name="cat_noca" />
</property>
<property name="Tradat" type="string">
<column name="cat_dat" length="50" />
</property>
</class>
</hibernate-mapping>

Categoria is 2 Table is which is the main

package entidad;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "trama", catalog = "bd_1" )

public class Categoria implements java.io.Serializable {

private int catNoca;
private String catNom;

public Categoria() {}

public Categoria(int catNoca, String catNom)
{this.catNoca = catNoca; this.catNom = catNom;}

@Id
@Column(name="cat_noca", nullable=false)
public int getCatNoca() {return this.catNoca;}
public void setCatNoca(int catNoca) {this.catNoca = catNoca;}

@Column(name="cat_nom", nullable=false, length=45)
public String getCatNom() {return this.catNom;}
public void setCatNom(String catNom) { this.catNom = catNom; }
}
This is His mapping

<hibernate-mapping>
<class name="entidad.Categoria" table="categoria" catalog="bd_1">
<id name="CatNoca" type="int">
<column name="cat_noca" />
<generator class="assigned"></generator>
</id>
<property name="CatNom" type="string">
<column name="cat_nom" length="50" />
</property>
</class>
</hibernate-mapping>
Strut2
Which sends the order

public void detalle2(String noca,T entity) {

Session session = HibernateUtil.getSessionFactory().openSession();
Transaction beginTransaction = session.beginTransaction();
session.createSQLQuery("select c.CatNoca, c.CatNom, t.CatNoca, t.TraNoca, t.CatNom, t.tradat from Trama t INNER JOIN Categoria c ON t.CatNoca="+entity);
beginTransaction.commit();
session.close();
}



package acciones;

import static com.opensymphony.xwork2.Action.INPUT;
import static com.opensymphony.xwork2.Action.SUCCESS;
import com.opensymphony.xwork2.ActionSupport;
import entidad.Categoria;
import java.util.List;
import servicio.ServicioCategoria;

public class CategoriaAction extends ActionSupport {

private ServicioCategoria sc= new ServicioCategoria();
private List<Categoria> lstCat;
private Categoria cat;
private String m;
private String i;
private Integer noca;

@Override
public String input() throws Exception {
if (getNoca()!=null) {setCat(sc.find(noca));}
return INPUT;}

public String detalle2() throws Exception {
if (getNoca()!=null) {setCat(sc.find(noca)); }
return INPUT;}

@Override
public String execute() throws Exception {return SUCCESS;}
public String save() { sc.save(getCat()); return "ok"; }
public String remove(){ sc.remove(getNoca()); return "ok"; }
public String list() throws Exception { lstCat=sc.findAll(); return execute();}
public String search() throws Exception { lstCat = sc.search(m);return execute();}
public String indice() throws Exception { lstCat = sc.search(i);return execute();}



//<editor-fold defaultstate="collapsed" desc="Getter y Setter">
public ServicioCategoria getSc() {return sc; }
public void setSc(ServicioCategoria sc) {this.sc = sc;}
public String getM() { return m;}
public void setM(String m) { this.m = m; }
public String getI() { return i; }
public void setI(String i) { this.i = i;}
public Integer getNoca() { return noca; }
public void setNoca(Integer noca) {this.noca = noca;}
public Categoria getCat() {return cat;}
public void setCat(Categoria cat) { this.cat = cat; }
public List<Categoria> getLstCat() {return lstCat;}
public void setLstCat(List<Categoria> lstCat) {this.lstCat = lstCat;}
//</editor-fold>
}
ServicioCategoria.java
public class ServicioCategoria extends AbstractFacade<Categoria> {
public ServicioCategoria() {super(Categoria.class);}


//CATEGORIA

public List<Categoria> findAll() {return super.findAll();}
public void save(Categoria cat) {super.createEdit(cat);}
public void remove(int noca) {
final Categoria find = super.find(noca);
if (find!=null){
super.remove(find);}
}
public Categoria find (int noca) {
return super.find(noca);
}

//TRAMA
}
The JSP SAMPLE ONLY data table category
No I Get to join the tables I'm desperate

<%@ taglib prefix="s" uri="/struts-tags" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<br/>
<h2>Mopstrar Datos</h2>
<s:iterator>
<s:form action="categoriaDetalle2">
<s:label label="Nombre" name="cat.catNoca" />
<s:label label="Nombre" name="cat.catNom" />
<s:label label="La 2 tabla" />
<s:label label="Nombre de trama" name="tra.Tradat" />
<s:label label="Nombre de trama" name="tra.catNom" />
</s:form>
</s:iterator>

</body>
</html>