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From Babu Wisor <>
Subject Re: how to do auto update/reload of a class?
Date Wed, 31 Jul 2002 17:15:08 GMT
Hi All,
      Does anyone have any thoughts as to how to auto
re-load the classes, which have been loaded into JVM
using Custom Class loader? I tried writing custom
class loader and loaded all the classes, but don't
know how to re-load the same class, if it has been
modified (re-compiled) without shutting down JVM,
similar to JSP engine, where if we put updated JSP
file, it picks up the new file. 

Note: I learnt that, we need to recreate new class
loader and load all the classes again, but don't know
exactly how to apply that technique in the system. Any
help is greatly appreciated.

Thank you,
--- Ian Darwin <> wrote:
> On July 28, 2002 10:32 pm, you wrote:
> >     Does anyone know, how to do auto update of
> classes
> > into the JVM? I
> > tried to write my own custom class loader, and
> loaded
> > all the classes
> > through it, however if I put new updated class, it
> > won't reload the
> > class again. Have anyone tried this before? Help
> is
> > very much
> > appreciated.
> This better asked on an advanced-java list; not
> tomcat specific.
> For all the cleverness of Java's dynamic loading
> mechanism (ClassLoader,
> Class.forName, newInstance(), etc.), there is no
> published API for unloading or reloading. 
> They just didn't think of it in time, perhaps.
> What I think Tomcat and others do is basically to
> manage the class loader for each Context
> (which has to be separate from the CL for each other
> Context for configuration
> and security reasons anyway) in such a way that you
> can delete
> it (un-reference it) and assign a new one and reload
> the classes
> for the given Context.
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