Java.io.NotActiveException

Question

package serialization;
import java.io.*;
* DOCUMENT ME!
* @author   $author$
* @version  $Revision$
public class First
     implements Serializable
     //~ Constructors ...........................................................................................................
      * Creates a new First object.
      * @param  x  DOCUMENT ME!
     public First( int x )
          selectedValue = x;
     //~ Methods ................................................................................................................
      * DOCUMENT ME!
      * @param  args  DOCUMENT ME!
     public static void main( String args[] )
          new First( 15 );
          First first = new First( 20 );
          first.Method( first );
     } // end method main
     //~ ........................................................................................................................
      * DOCUMENT ME!
      * @param  object  DOCUMENT ME!
     public void Method( First object )
          try
               notSerializable = new NotSerializable( 50 );
               File file = new File( "serialised.text" );
               FileOutputStream   stream = new FileOutputStream( file );
               ObjectOutputStream o       = new ObjectOutputStream( stream );
               writeObject( o );
          catch( IOException e )
               e.printStackTrace();
          try
               FileReader            fileReader         = new FileReader( "serialised.text" );
               FileInputStream   inputStream         = new FileInputStream( "serialised.text" );
               ObjectInputStream objectInputStream = new ObjectInputStream( inputStream );
               readObject( objectInputStream );
          catch( IOException e )
               e.printStackTrace();
     } // end method Method
     //~ ........................................................................................................................
      * DOCUMENT ME!
      * @param  is  DOCUMENT ME!
     private void readObject( ObjectInputStream is )
          try
               is.defaultReadObject();
               NotSerializable newObject = new NotSerializable( is.readInt());
               First              objects   = (First) is.readObject();
               System.out.println( "retrieved value is : " + objects.selectedValue );
               System.out.println( "retrieved value from the other class is : " + newObject.getValue());
          catch( IOException e )
               e.printStackTrace();
          catch( ClassNotFoundException e )
               // TODO Auto-generated catch block
               e.printStackTrace();
     private void writeObject( ObjectOutputStream o )
          try
               o.defaultWriteObject();
               o.writeInt( notSerializable.getValue());
          catch( IOException e )
     //~ Instance variables .....................................................................................................
      * Field DOCUMENT ME!
     private transient NotSerializable notSerializable = null;
      * Field DOCUMENT ME!
     private int selectedValue = 0;
} // end class First
package serialization;
public class NotSerializable
     public NotSerializable( int x )
          value = x;
     public int getValue()
          return value;
     public void setValue( int value )
          this.value = value;
     private int value;
} // end class NotSerializableWhen I run First.java
The output that I get is :
java.io.NotActiveException: not in call to readObject
     at java.io.ObjectInputStream.defaultReadObject(Unknown Source)
     at serialization.First.readObject(First.java:153)
     at serialization.First.Method(First.java:134)
     at serialization.First.main(First.java:61)
Can someone explain me how to fix the issue

Answer 1

Hi,*
Facing issues with the following program using serialization.
I am trying to use a transient member (Collar c) in class Dog. Have implemented readObject and writeObject to read and write the transient member. The code compliles fine, but when I try to print the member varaible for c ( instance of Collar in Dog), it throws a null pointer exception. So, seems like readObject and writeObject is not doing things correctly.
I also tried to print from within readObject and writeObject. Apprently, those lines are not exceuted at all.
Am I doing anything wrong ? A quick help will be highly appreciated.
*package test;
import java.io.*;
public class Test {
public static void main ( String [] args ){
Dog dOut = new Dog ( new Collar (0), 0);
Collar c = new Collar (10);
Dog d = new Dog (c, 5);
try {
File f = new File ("abc.txt");
FileOutputStream fo = new FileOutputStream (f);
ObjectOutputStream os = new ObjectOutputStream (fo) ;
os.writeObject(d);
os.close();
} catch ( Exception e) { e.printStackTrace(); }
try {
FileInputStream fi = new FileInputStream ("abc.txt");
ObjectInputStream is = new ObjectInputStream (fi);
dOut = (Dog)is.readObject();
is.close();
} catch ( Exception e) { e.printStackTrace(); };
if ( dOut != null)
System.+out+.println (dOut.getCollar().getCollarSize());
class Dog implements Serializable {
private transient Collar c;
private int dogSize;
public Dog ( Collar col, int size) {
c = col;
dogSize = size;
public Collar getCollar () { *return* c ; }
public int getDogSize () { *return* dogSize; }
public void writeObject (ObjectOutputStream os){
System.+out+.println("Object Write");
try{
os.defaultWriteObject();
os.writeInt(c.getCollarSize());
}*catch* ( Exception e) {e.printStackTrace();}
public void readObject (ObjectInputStream is) {
System.+out+.println("Object Read");
try{
is.defaultReadObject();
int i = is.readInt();
c = new Collar (i);
}*catch* ( Exception e) {e.printStackTrace();}
class Collar {
private int collarSize;
Collar ( int i ) { collarSize = i; }
public int getCollarSize () {
return collarSize;