Re: [Jython-dev] jreload--it IS possible to reload a class in the same classloader

[Samuele P. <ped...@bl...>]

Have you tried that. Has he tried that?

I have tried with:

1)
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

2)
java version "1.1.7A"

3)
Caricatore riga comandi Microsoft (R) per Java Versione 5.00.3802
Copyright (C) Microsoft Corp 1996-2000. Tutti i diritti riservati.
(It's jview, Versione is version)

Funny, Funny.
(To be honest I didn't need to try, jview not with standing)

regards, Samuele Pedroni.

----- Original Message -----
From: Updike, Clark <Cla...@jh...>
To: <jyt...@li...>
Sent: Monday, January 28, 2002 4:15 PM
Subject: [Jython-dev] jreload--it IS possible to reload a class in the same
classloader


> regarding http://www.jython.org/docs/jreload.html and the statement:
>
> "Why there is no support for reloading a single class? Java classes are
> loaded through class-loaders, actually there is no support in java to
> redefine an already loaded class through its class-loader."
>
> I don't mean to split hairs here, but it IS actually possible to redefine an
> already-loaded class in the same classloader as long as you use Class
> methods to load it.  i.e.
> use:
>
> Class redefineable = Class.forName("MyRedefinealbeClass");
> redefineable.newInstance();
>
> // Assume the previous version of MyRedefineableClass.class was modified
> // Reload the new one...
> redefineable  = null;
> System.gc();
> Class redefineable = Class.forName("MyRedefineableClass");
> redefineable.newInstance();
>
> Instead of:
>
> MyUNRedefinableClass unRedefineable = new MyUNRedefineableClass();
> murdc = null;
>
> // does NOT pick up any changes to MyRedefineableClass.class
> unRedefineable = new MyUNRedefineableClass();
>
>
> This functionality is described in the following article,
> http://www.sys-con.com/java/articleprint.cfm?id=307
>
> I don't know if this adds any new possibilities for jreload or not (or if
> I'm wrong), but thought it worth pointing out anyway.  Note that the article
> makes a call to System.gc() to "force" the classloader to dump the current
> version but I don't believe System.gc() guarantees that this will happen.
>
> -Clark
>
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