Prime Faces error Cannot add the same component twice

Question

I am new to Java Server Faces. I am doing one simple login jsf application which has layout.xhtml, login.xhtml, loginbean.java, changepassword.xhtml, changepasswordbean.java. Login functions are working fine but changepassword function is causing some problem which I can't find what's the reason for error. I am getting error when clicking Clear Button in changepassword.xhtml page. If I click changepassword button a Null pointer exception have occured because I am trying to get a value(companyid) from another loginbean to changepasswordbean. After clicking back button in browser then selecting changepassword menu I am getting a error like Parent was not null, but this component not related. Sometimes menus will not be displayed. I don't know what's the problem, so any help here.

LoginBean.java

    import javax.faces.bean.ManagedBean;
    import javax.faces.bean.ManagedProperty;
    import javax.faces.bean.SessionScoped;
    import java.io.Serializable;
    import javax.faces.application.FacesMessage;
     import javax.faces.context.FacesContext;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

     @ManagedBean
    @SessionScoped
      public class LoginBean implements Serializable 
    {
     Logger log;

      @ManagedProperty(value = "loginBean")

      public boolean isLoggedin;
     public String username;
       public String password;    
     public String companyid;  
     public boolean notloggedin;   

    @ManagedProperty(value = "#{tabMenu}")
    private TabMenu tabMenu;

    public LoginBean() 
      {
          log=LoggerFactory.getLogger(LoginBean.class);
           }

     public void clear()
        {        
     setUsername(null);
     setPassword(null);
     setCompanyId(null);
    }

      public String login()
     {       
    setIsLoggedin(true);
            setNotLoggedIn(false);                
            setCompanyId("companyid_1");          
            tabMenu.setTabMenu();
            return "home";


 }   

public String logout()
{
    FacesContext.getCurrentInstance().getExternalContext().invalidateSession();
    setIsLoggedin(false);
    setNotLoggedIn(true);
    return "/login.xhtml?faces-redirect=true";
}

public void setUsername(String username)
{
    this.username=username;
}

public String getUsername()
{       
    return username;
}

public void setPassword(String password)
{
    this.password=password;
}

public String getPassword()
{       
    return password;
}

public void setIsLoggedin(boolean isloggedin)
{
    this.isLoggedin=isloggedin;
}

public boolean getIsLoggedin()
{               
    return isLoggedin;
}

public void setNotLoggedIn(boolean notloggedin)
{
    this.notloggedin=notloggedin;
}

public boolean getNotLoggedIn()
{       
    if(getIsLoggedin())
    {
        this.notloggedin=false;
    }
    else
        this.notloggedin=true;

    return notloggedin;
}

public void setCompanyId(String companyid)
{
    this.companyid=companyid;
}

public String getCompanyId()
{       
    return companyid;
}

public TabMenu getTabMenu() 
{
    return tabMenu;
}

public void setTabMenu(TabMenu tabMenu)
{
    this.tabMenu = tabMenu;
}    

    }

ChangePasswordBean.java

    import java.io.Serializable;
    import javax.faces.application.FacesMessage;
    import javax.faces.bean.ManagedBean;
     import javax.faces.bean.ManagedProperty;
     import javax.faces.bean.RequestScoped;
     import javax.faces.context.FacesContext;
     import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

   @ManagedBean
     @RequestScoped
      public class ChangePasswordBean implements Serializable
       {
     Logger log;

@ManagedProperty(value = "changePasswordBean")
public String oldPassword;    
public String newPassword;
public String retypePassword;

@ManagedProperty(value = "#{loginBean}")
public LoginBean lbean;

public ChangePasswordBean() 
{
    log=LoggerFactory.getLogger(ChangePasswordBean.class);
}

public void changePassword()
{
    log.debug("Company Id: "+lbean.getCompanyId());
    log.debug("User Name: "+lbean.getUsername());      
    boolean flag=false;
    ChangePasswordDAO changepass=new ChangePasswordDAO();

    if(oldPassword!=null && newPassword!=null && retypePassword!=null)
    {
        if(newPassword.equals(retypePassword))
        {
            flag=changepass.changePassword(oldPassword, newPassword,lbean.getUsername(),lbean.getCompanyId());
            if(flag)
            {
                FacesContext.getCurrentInstance().addMessage("changepassform:btnchange", new FacesMessage(FacesMessage.SEVERITY_INFO,"Info", "Password Changed Successfully"));
            }
            else
            {
                FacesContext.getCurrentInstance().addMessage("changepassform:btnchange", new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error", "Password Not Changed"));
            }
        }
        else
        {
            FacesContext.getCurrentInstance().addMessage("changepassform:btnchange", new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error", "New Password and Retype Password didn't match"));
        }
    }
    else
    {
        FacesContext.getCurrentInstance().addMessage("changepassform:btnchange", new FacesMessage(FacesMessage.SEVERITY_WARN, "Warning", "Old Password/New Password/Retype Password Should not be empty"));
    }

}

public void clear()
{        
    setOldPassword(null);
    setNewPassword(null);
    setRetypePassword(null);
}

public void setOldPassword(String oldPassword)
{
    this.oldPassword=oldPassword;
}

public String getOldPassword()
{
    return oldPassword;
}

public void setNewPassword(String newPassword)
{
    this.newPassword=newPassword;
}

public String getNewPassword()
{
    return newPassword;
}

public void setRetypePassword(String retypePassword)
{
    this.retypePassword=retypePassword;
}

public String getRetypePassword()
{
    return retypePassword;
}

public void setLbean(LoginBean lbean)
{
    this.lbean=lbean;
}

public LoginBean getLbean()
{
    return lbean;
}

}

changepassword.xhtml

Ajeesh · Accepted Answer

I solved this issue by setting the transient option=true. Because I was creating menus dynamically which resulted in "WARNING: Unable to save dynamic action with clientId 'j_idt8:j_idt9:0:j_id3' because the UIComponent cannot be found" and "Cannot remove the same component twice: j_idt8:j_idt9:j_id3" problems.

    public void setMenus(String type)
{
    MenuItem item;        
     item=new MenuItem();
        item.setValue("Change Password");
        item.setStyle("color:black");    
        item.setTransient(true);   /* Set this to solve the problem */
        item.setUrl("/adminAccount/changepassword.xhtml");
        submenus.addMenuItem(item);           

}

Prime Faces error Cannot add the same component twice

Answers (1)

Related Questions