Error creating a Login Interface

[Pankaj Bhambhani]

Hi ,
I am building a Login interface of a mail application as a part of our Java Project.

I am using the following two Java files in my application

//------------------LoginBean.java------------
package login;

import java.util.*;
import java.io.*;


public class LoginBean {

private String username;
private String password;


... //-----------Constructers and settters and getters------------------------



 public String loginPage() throws IOException, ClassNotFoundException {

        ArrayList<Authentication> loginList;
        Authentication foundUser=null; 	

	File f = new File("ll.panx");
 
        if(f.exists()) {

		ObjectInputStream in = new ObjectInputStream(new FileInputStream(f));
                loginList = (ArrayList<Authentication>) in.readObject();
                in.close();
         }

         else {

               loginList = new ArrayList<Authentication> ();
	
	       loginList.add(new Authentication("pankajb64","pankajb64"));
	       loginList.add(new Authentication("panx","admin"));
	       loginList.add(new Authentication("you","secret"));

    
	      ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(f));
 
	      out.writeObject(loginList);
	}

                       
           for(int i=0; i<loginList.size();i++) {

              Authentication a = loginList.get(i); 		
              if(a.getUserName().equals(username))  {
                    foundUser = a;
                     break;
               }
            }
             

          if(foundUser == null) {
                enterRegistry("invalid"); //Enters information about last login attempt into a file
                return "relogin";
           } 
         
           if(foundUser.getPassword().equals(password)) {

                  enterRegistry(username);
                  return "welcome";
            }

             else {
                enterRegistry("invalid");
                return "relogin";
             }                             


  }
...   //---------Other methods-------

  }

//----------------------------------Authentication.java------------------

package login;

import java.io.*;

public class Authentication implements Serializable {


private String uname;
private String pwd;

...   //--------Constructors and setters and getters--------


}

When I tested my authentication class in isolation, it worked fine .
But when i attached it to my application, I get the following error EVEN THOGH MY CLASS AUTHENTICATION IMPLEMENTS SERIALIZABLE INTERFACE

//-------------------Exception----------
message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: #{login.loginPage}: javax.faces.el.EvaluationException: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: login.Authentication
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:209)

root cause

javax.faces.FacesException: #{login.loginPage}: javax.faces.el.EvaluationException: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: login.Authentication
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:78)
	javax.faces.component.UICommand.broadcast(UICommand.java:312)
	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

root cause

javax.faces.el.EvaluationException: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: login.Authentication
	com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:130)
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
	javax.faces.component.UICommand.broadcast(UICommand.java:312)
	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

root cause

java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: login.Authentication
	java.io.ObjectInputStream.readObject0(Unknown Source)
	java.io.ObjectInputStream.readObject(Unknown Source)
	java.util.ArrayList.readObject(Unknown Source)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
	java.io.ObjectInputStream.readSerialData(Unknown Source)
	java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
	java.io.ObjectInputStream.readObject0(Unknown Source)
	java.io.ObjectInputStream.readObject(Unknown Source)
	login.LoginBean.loginPage(LoginBean.java:56)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:126)
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
	javax.faces.component.UICommand.broadcast(UICommand.java:312)
	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

root cause

java.io.NotSerializableException: login.Authentication
	java.io.ObjectOutputStream.writeObject0(Unknown Source)
	java.io.ObjectOutputStream.writeObject(Unknown Source)
	java.util.ArrayList.writeObject(Unknown Source)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	java.io.ObjectOutputStream.writeObject0(Unknown Source)
	java.io.ObjectOutputStream.writeObject(Unknown Source)
	login.LoginBean.loginPage(LoginBean.java:71)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:126)
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
	javax.faces.component.UICommand.broadcast(UICommand.java:312)
	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
Apache Tomcat/6.0.20

Please help me out with this.


Thanks in advance.

[David Newton]

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