java.io.InvalidClassException: aucun constructeur

Quand je lance le programme ci-dessous, je suis une exception, comme le

java.io.InvalidClassException: Files.SerializationMain; Files.SerializationMain; no valid constructor
    at java.io.ObjectStreamClass.checkDeserialize(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at Files.SerializationClass.main(SerializationClass.java:71)
Caused by: java.io.InvalidClassException: Files.SerializationMain; no valid constructor
    at java.io.ObjectStreamClass.<init>(Unknown Source)
    at java.io.ObjectStreamClass.lookup(Unknown Source)
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.writeObject(Unknown Source)
    at Files.SerializationClass.main(SerializationClass.java:61)

J'ai lu quelque part que lorsque nous sérialiser un enfant de la classe puis de sa classe de base constructeur obtient déclenché.

class Parent123
{
int age;
String name;
Parent123(int age,String name) {
System.out.println("We are in Parent123 Constructor");
this.age=age;
this.name=name;
}  
}
class SerializationMain extends Parent123 implements Serializable {
int data1;
String data2;
SerializationMain(int data1,String data2)
{
super(20,"test");
this.data1=data1;
this.data2=data2;
}
public void setData1(int data1)
{
this.data1=data1;
}
public void setData2(String data2)
{
this.data2=data2;
}
public String getData2()
{
return data2;
}
public int getData1()
{
return data1;
}
}
public class SerializationClass {
public static void main(String args[])
{
System.out.println("Before Creating Object");
SerializationMain s1=new SerializationMain(10,"Anurag");
try
{
System.out.println("Serializing Object");
FileOutputStream fis=new FileOutputStream("Test.ser");
ObjectOutputStream ois=new ObjectOutputStream(fis);
ois.writeObject(s1);
} catch(Exception e1) {
e1.printStackTrace();
}
try
{
FileInputStream fis=new FileInputStream("Test.ser");
ObjectInputStream ois=new ObjectInputStream(fis);
Object o1=ois.readObject();
SerializationMain s2=(SerializationMain)o1;
}
catch(Exception e1)
{
e1.printStackTrace();
}
}
}//End of SerializationClass