java.lang.ClassNotFoundException: serialization.SerializedObject
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:289)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:247)
        at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:604)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at lab10svang6.Main.main(Main.java:43)

import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;


public class Main
{


    public static void main(String[] args)
    {
        //read file
        FileInputStream fis = null;
        try
        {
            //read in file
            fis = new FileInputStream("Instructions.ser");
            ObjectInputStream input = new ObjectInputStream(fis);
            ArrayList<SerializedObject> aliSO = new ArrayList<SerializedObject>();
            SerializedObject instruction;
            
            //read data
            try
            {
                while( true )
                {
                    instruction = (SerializedObject) input.readObject();
                    aliSO.add(instruction);

                    for( int i = 0; i <= aliSO.size(); i++ )
                    {
                        for( SerializedObject so : aliSO )
                        {
                            if( i == so.getIntValue() )
                            {
                                System.out.print(so);
                            }
                        }
                    }
                }
            } //end try
            //close file
            catch( EOFException ex )
            {
                input.close();
            }
        }
        catch( FileNotFoundException ex )
        {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            System.err.println("File not found.");
        }
        catch( IOException ex )
        {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            System.err.println("Error opening file.");
        }
        catch( ClassNotFoundException ex )
        {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        finally
        {
            try
            {
                fis.close();
            }
            catch( IOException ex )
            {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
                System.err.println("Error closing file.");
            }
        }


    }
}