java.lang.ClassCastException During Deserialization in java

At time of deserialization by below code

FileInputStream out= new FileInputStream("c://ser//ser.txt");

ObjectInputStream outs= new ObjectInputStream(out);

      Employee e=(employee)outs.readObject();

If JVM unable to identify the class type i.e. when outs try to call method readObject and programmer given wrong class reference then it will throw  exception

java.lang.ClassCastException: Serlialization.employee1