Why serialVersionUID Is Required??
serialVersionUID is used to identify the class during deserialization process.if you don't mention serialVersionUID in your class then by default JVM will generate it . JVM generated serialVersionUID will be a 64 bit hash value of class name ,method and fields.But there is a problem in not declaring serialVersionUID manually. Let me explain it with the example , This is my class which i want to serialize public class Employee implements Serializable { /** * */ public int getEmpId() { return empId; } public void setEmpId(int empId) { this.empId = empId; } public String getEmpName() { return empName; } public void setEmpName(String empName) { this.empName = empName; } private int empId; transient private String empName; } In the above code i didn't declare serialVersionUID. Below code used to serialize the Employee object public class Serializ