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Updating Entity with Collection

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wheels979

Post subject: Updating Entity with Collection

Posted: Wed Oct 13, 2010 3:49 pm

Newbie

Joined: Thu Aug 19, 2010 3:36 pm
Posts: 3

Hi All,

I am fairly new to Hibernate. I have what seems like a fairly simple question. I need to understand how to update an entity that has an association with another entity.

I have two entities User and Role entity. User has certain fields, firstName, lastName, etc... I am able to display these to the user using Spring MVC and they are able to update them and it works fine. The problem comes when I added the association to the Role entity and a field of type List called "Roles" to the User entity. I am able to display this to the user using checkboxes but when they select a role and hit submit I get a class cast exception. Specifically...

Code:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)

root cause

java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String
    org.hibernate.type.StringType.toString(StringType.java:44)
    org.hibernate.type.NullableType.toLoggableString(NullableType.java:168)
    org.hibernate.type.EntityType.toLoggableString(EntityType.java:471)
    org.hibernate.type.CollectionType.renderLoggableString(CollectionType.java:160)
    org.hibernate.type.CollectionType.toLoggableString(CollectionType.java:144)
    org.hibernate.pretty.Printer.toString(Printer.java:53)
    org.hibernate.pretty.Printer.toString(Printer.java:90)
    org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:97)
    org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
    org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
    $Proxy35.flush(Unknown Source)
    com.edusoft.inote.dao.UserDAOImpl.editUser(UserDAOImpl.java:39)
    com.edusoft.inote.service.UserManagerImpl.editUser(UserManagerImpl.java:59)
    com.edusoft.inote.web.UserFormController.editProfile(UserFormController.java:164)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
    org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)

User Entity

Code:

@Entity  
@Table(name="users")
public class User implements Serializable{

    private String username;

    private String password;
    
    private String firstName;

    private String lastName;
    
    private String confirmpassword;

    private int enabled;
    
    private String authtoken;
    
    private List<Roles> roles;

    
///////////// Getters /////////////////    
    @Id
    @Column (name = "username", length=50)
    @NotEmpty(message = "{user.username.blank}")
    @Email(message = "{user.username.valid}")
    public String getUsername() {
        return username;
    }
    @NotEmpty(message = "{user.password.blank}")
    @Column (name = "password", length=50)
    public String getPassword() {
        return password;
    }
    @Transient
    public String getConfirmpassword() {
        return confirmpassword;
    }
    @Column (name = "firstname", length=50)
    @NotEmpty(message = "{user.firstname.blank}")
    public String getFirstName() {
        return firstName;
    }
    @Column (name = "lastname", length=50)
    @NotEmpty(message = "{user.lastname.blank}")
    public String getLastName() {
        return lastName;
    }
    @Column (name = "enabled", length=50)
    public int getEnabled() {    
        return enabled;
    }

    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(name = "user_role",
       joinColumns = { @JoinColumn(name = "userid") },
       inverseJoinColumns = { @JoinColumn(name = "roleid") })
    public List<Roles> getRoles() {
        return roles;
    }
    
    /*
    @OneToMany(targetEntity=Authority.class, cascade=CascadeType.ALL, fetch=FetchType.EAGER )
    @JoinColumn(name="username")
    public List<Authority> getAuthorities() {
        return authorities;
    }
    */
    
    @Column (name="authtoken", length=50)
    public String getAuthtoken() {
        return authtoken;
    }
////////////////// Setters ///////////////////////
    public void setUsername(String userName) {
        this.username = userName;
    }
    public void setPassword(String password){
        this.password = password;
    }    
    public void setFirstName(String name) {
        this.firstName = name;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public void setEnabled(int enabled) {
        this.enabled = enabled;
    }
    public void setConfirmpassword(String confirmpassword) {
        this.confirmpassword = confirmpassword;
    }
    
    public void setRoles(List<Roles> roles){
        this.roles = roles;
    }
    /*
    public void setAuthorities(List authority) {
        this.authorities = authority;
    }
    */
    public void setAuthtoken(String authtoken) {
        this.authtoken = authtoken;
    }
}

Roles

Code:

@Entity  
@Table(name="roles")
public class Roles {

   private String id;
   private String role;
    private List<User> users;
   
   public Roles(){

   }
   
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
   public String getId() {
      return id;
   }
   public void setId(String id) {
      this.id = id;
   }
   @Column (name = "role", length=50)
   public String getRole() {
      return role;
   }
   public void setRole(String role) {
      this.role = role;
   }
   @ManyToMany(mappedBy = "roles")
   public List<User> getUsers() {
      return users;
   }
   public void setUsers(List<User> users) {
      this.users = users;
   }   
   
}

DAO Method

Code:

    public void editUser(User user) {
        logger.info("UserDAOImpl:editUser "+user.getUsername());
        Session session = HibernateFactory.getSessionFactory().getCurrentSession();
        Transaction tx = session.beginTransaction();        
        session.update(user);
        session.flush();
        tx.commit();
        super.closeSession(session);
    }

JSP/View

Code:

         <tr>
            <td>Roles :</td>
            <td><form:checkboxes path="roles" items="${rolesList}" itemValue="id" itemLabel="role" /></td
         </tr>

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