Re: [PATCH]

[Bryce McKinlay]

Dalibor Topic wrote:

> --- classpath/java/io/Serializable.java Sat Nov 17 15:00:13 2001
> +++ patched/java/io/Serializable.java   Sat Nov 17 16:04:01 2001
> @@ -40,6 +40,7 @@
>   */
> public interface Serializable
> {
> +    static final long serialVersionUID = 1196656838076753133L;
> } // interface Serializable

This is redundant. An explicit serialVersionUID is only required when a 
classes implementation may be different from the JDK version (different 
private fields, for example), or where a class has evolved over time and 
needs to be backward-compatible with serialized instances from the older 
versions.

You can write your own simple serialver utility to verify this:

import java.io.*;

public class SerialVer
{
 public static void main(String[] args) throws ClassNotFoundException
 {
   String className = args[0];
   Class cl = Class.forName(className);
   ObjectStreamClass osc = ObjectStreamClass.lookup(cl);
   System.out.println (osc.getSerialVersionUID());   
 }
}

$ serialver java.io.Serializable
java.io.Serializable:    static final long serialVersionUID = 
1196656838076753133L;

$ gij SerialVer java.io.Serializable
1196656838076753133

regards,

Bryce.