0 Replies Latest reply on Dec 8, 2006 4:11 PM by Mariano Kocalka Machala

    Problems with ejb3 EntityManager, find method

    Mariano Kocalka Machala Newbie

      Hi, i got the following exception when i run my code


      Hibernate: select rol0_.ROL_ID as ROL1_6_0_, rol0_.ADMINISTRADOR as ADMINIST2_6_0_, rol0_.DESCRIPCION as DESCRIPC3_6_0_, rol0_.HABIL
      ITADO as HABILITADO6_0_, rol0_.NOTAS as NOTAS6_0_ from ROL rol0_ where rol0_.ROL_ID=?
      17:21:47,640 ERROR [STDERR] java.lang.ClassCastException: ar.com.ebizlink.server.models.Rol
      17:21:47,640 ERROR [STDERR] at $Proxy97.getRol(Unknown Source)
      17:21:47,640 ERROR [STDERR] at ar.com.ebizlink.console.controllers.RolController.edit(Unknown Source)
      


      My enviroment is:
      jboss-4.0.5.GA, jems installer (ejb3 instalation)
      j2sdk1.5.0_09
      jboss-eclipse 1.5
      and the files are listed next ...

      Rol.java
      package ar.com.ebizlink.server.models;
      
      import javax.persistence.Column;
      import javax.persistence.Entity;
      import javax.persistence.GeneratedValue;
      import javax.persistence.Id;
      import javax.persistence.Table;
      
      @Entity
      @Table(name = "ROL")
      public class Rol implements java.io.Serializable {
      
       private static final long serialVersionUID = 1L;
      
       // Fields
       private Long rolId;
      
       private String descripcion;
      
       private Boolean habilitado;
      
       private Boolean administrador;
      
       private String notas;
      
       // Constructors
      
       /** default constructor */
       public Rol() {
       }
      
       /** minimal constructor */
       public Rol(Long rolId) {
       this.rolId = rolId;
       }
      
       /** full constructor */
       public Rol(Long rolId, String descripcion, Boolean habilitado,
       Boolean administrador, String notas) {
       this.rolId = rolId;
       this.descripcion = descripcion;
       this.habilitado = habilitado;
       this.administrador = administrador;
       this.notas = notas;
       }
      
       // Property accessors
       @Id
       @GeneratedValue
       @Column(name = "ROL_ID", unique = true, nullable = false, insertable = true, updatable = true)
       public Long getRolId() {
       return this.rolId;
       }
      
       public void setRolId(Long rolId) {
       this.rolId = rolId;
       }
      
       @Column(name = "DESCRIPCION", unique = false, nullable = true, insertable = true, updatable = true, length = 50)
       public String getDescripcion() {
       return this.descripcion;
       }
      
       public void setDescripcion(String descripcion) {
       this.descripcion = descripcion;
       }
      
       @Column(name = "HABILITADO", unique = false, nullable = true, insertable = true, updatable = true)
       public Boolean getHabilitado() {
       return this.habilitado;
       }
      
       public void setHabilitado(Boolean habilitado) {
       this.habilitado = habilitado;
       }
      
       @Column(name = "ADMINISTRADOR", unique = false, nullable = true, insertable = true, updatable = true)
       public Boolean getAdministrador() {
       return this.administrador;
       }
      
       public void setAdministrador(Boolean administrador) {
       this.administrador = administrador;
       }
      
       @Column(name = "NOTAS", unique = false, nullable = true, insertable = true, updatable = true, length = 100)
       public String getNotas() {
       return this.notas;
       }
      
       public void setNotas(String notas) {
       this.notas = notas;
       }
      
      }
      


      RolManager.java
      package ar.com.ebizlink.server.interfaces;
      
      import java.util.List;
      
      import javax.ejb.Local;
      
      import ar.com.ebizlink.server.models.Rol;
      
      @Local
      public interface RolManager {
      
       public Rol getRol(Long rolId);
      
       public List<Rol> getRoles();
      
       public void save(Rol detached);
      
       public void delete(Long rolId);
      }
      


      The bean instance
      package ar.com.ebizlink.server.beans;
      
      import java.util.List;
      
      import javax.ejb.Stateless;
      import javax.ejb.TransactionAttribute;
      import javax.ejb.TransactionAttributeType;
      import javax.persistence.EntityManager;
      import javax.persistence.PersistenceContext;
      
      import ar.com.ebizlink.server.interfaces.RolManager;
      import ar.com.ebizlink.server.models.Rol;
      
      @Stateless
      public class RolManagerBean implements RolManager {
      
       @PersistenceContext
       private EntityManager em;
      
       public Rol getRol(Long rolId) {
       return em.find(Rol.class, rolId);
       // Query query = em.createQuery("select r from Rol r where r.rolId =
       // :rolId");
       // query.setParameter("rolId", rolId);
       // return (Rol)query.getSingleResult();
       }
      
       @SuppressWarnings("unchecked")
       public List<Rol> getRoles() {
       return em.createQuery("from Rol").getResultList();
       }
      
       @TransactionAttribute(TransactionAttributeType.REQUIRED)
       public void save(Rol detached) {
       Rol rol = getCurrent(detached.getRolId());
       rol.setAdministrador(detached.getAdministrador());
       rol.setDescripcion(detached.getDescripcion());
       rol.setHabilitado(detached.getHabilitado());
       rol.setNotas(detached.getNotas());
       em.persist(rol);
       }
      
       @TransactionAttribute(TransactionAttributeType.MANDATORY)
       private Rol getCurrent(Long rolId) {
       Rol rol = getRol(rolId);
       if (rol == null) {
       rol = new Rol();
       em.persist(rol);
       }
       return rol;
       }
      
       @TransactionAttribute(TransactionAttributeType.REQUIRED)
       public void delete(Long rolId) {
       Rol rol = getRol(rolId);
       em.remove(rol);
       }
      
      }
      


      JSF CODE - RolController.java
      package ar.com.ebizlink.console.controllers;
      
      import java.util.List;
      
      import ar.com.ebizlink.console.forms.RolForm;
      import ar.com.ebizlink.server.interfaces.RolManager;
      import ar.com.ebizlink.server.models.Rol;
      import ar.com.ulink.framework.commons.tokens.CommonsTokens;
      import ar.com.ulink.framework.ejb3.EJB3ServiceLocator;
      import ar.com.ulink.framework.mvc.jsf.JsfUtility;
      
      public class RolController {
      
       private RolForm rolForm;
      
       public final RolForm getRolForm() {
       return rolForm;
       }
      
       public final void setRolForm(RolForm rolForm) {
       this.rolForm = rolForm;
       }
      
       // THIS METHOD WORKS FINE !!
      
       public final List<Rol> getRoles() {
       List<Rol> roles = null;
       try {
       RolManager rolManager = (RolManager) EJB3ServiceLocator
       .getEjbInterface("ebizlink/RolManagerBean/local");
       roles = rolManager.getRoles();
       } catch (Exception e) {
       e.printStackTrace();
       }
       return roles;
       }
      
       // HOWEVER, THIS ONE CRASH !!
       // when execute : Rol rol = rolManager.getRol(rolId);
      
       public final String edit() {
      
       // Status a devolver.
       String actionForward = CommonsTokens.EDIT_SUCCESS;
      
       // Tomo el parametro del rol a modificar.
       Long rolId = Long.valueOf(JsfUtility.getObjectFromContext("rolId")
       .toString());
      
       System.out.println("************* RolId: " + rolId);
      
       try {
       // Obtengo el rol a modificar.
       RolManager rolManager = (RolManager) EJB3ServiceLocator
       .getEjbInterface("ebizlink/RolManagerBean/local");
      
       System.out.println("************* paso 2, RolId: " + rolId);
      
       // Here's the exception
       Rol rol = rolManager.getRol(rolId);
      
       System.out.println("************* paso 3, RolId: " + rolId);
      
       // Asigno los datos al form.
       rolForm.setAdministrador(rol.getAdministrador());
       rolForm.setDescripcion(rol.getDescripcion());
       rolForm.setHabilitado(rol.getHabilitado());
       rolForm.setNotas(rol.getNotas());
       rolForm.setRolId(rol.getRolId());
      
       } catch (Exception e) {
       actionForward = CommonsTokens.EDIT_FAILURE;
       e.printStackTrace();
       }
      
       // Forward del formulario.
       return actionForward;
       }
      
      }
      


      i have the exception mentioned earlier and i dont have any clue where the probles is ...

      any ideas ??

      Regards
      Mariano