Groups > comp.lang.java.programmer > #29460

dealing with ClassLoaders...

From	Andreas Leitgeb <avl@auth.logic.tuwien.ac.at>
Newsgroups	comp.lang.java.programmer
Subject	dealing with ClassLoaders...
Date	2014-07-31 19:40 +0000
Organization	A noiseless patient Spider
Message-ID	<slrnltl6t2.fp3.avl@login.logic.tuwien.ac.at> (permalink)

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All the classes of my app are principially loadable by the system's
default ClassLoader (i.e. they are in the java.class.path).  Some
Main class (mypackage.Main) of my app will even be loaded, and this
class will then create a new Thread with a custom ClassLoader that
is supposed to load all the other used classes of my app's packages
(while still delegating loading of newly used system classes to its
parent).

The classloader tutorials I skimmed so far seem to imply, that
a custom classloader is only appropriate to enable classloading
from sources that the system classloader cannot handle itself.

Is there a clean way to keep classes of a given package confined
to some custom classloader, in order to control the classes' and
their statics' scope/lifetime?

The outset is, that some of these classes contain static data.
(They had been designed as standalone application classes.)
Now, to improve invocation time, one VM is supposed to run all
the program instances. This is effectively a followup to a 
previous c.l.j.p thread of mine, where I asked about a certain
kind of "application servers".

If this is a no-go, then I'll have to redesign those classes to
get rid of static data, but that will be some effort and require
passing around context references or use ThreadLocal stuff, so
my hope is for classloaders to provide me with an easier way out.

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dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-07-31 19:40 +0000
  Re: dealing with ClassLoaders... Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-31 20:44 +0000
    Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-01 14:22 +0000
      Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-01 21:10 +0000
        Re: dealing with ClassLoaders... Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-08-01 17:32 -0400
          Re: dealing with ClassLoaders... Joerg Meier <joergmmeier@arcor.de> - 2014-08-02 01:21 +0200
          Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-02 00:00 +0000
        Re: dealing with ClassLoaders... Martin Gregorie <martin@address-in-sig.invalid> - 2014-08-01 21:45 +0000
          Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-01 23:14 +0000
            Re: dealing with ClassLoaders... Martin Gregorie <martin@address-in-sig.invalid> - 2014-08-02 00:35 +0000
              Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-05 15:38 +0000
  Re: dealing with ClassLoaders... Silvio <silvio@internet.com> - 2014-08-01 13:31 +0200
    Re: dealing with ClassLoaders... Silvio <silvio@internet.com> - 2014-08-01 13:37 +0200
      Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-01 16:06 +0000
  Re: dealing with ClassLoaders... "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-08-01 13:19 +0100
    Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-01 15:51 +0000
  Re: dealing with ClassLoaders... Josip Almasi <joe@vrspace.org> - 2014-08-01 15:55 +0200
    Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-04 15:12 +0000
      Re: dealing with ClassLoaders... Mike Amling <mamling@chaff.us> - 2014-08-04 19:53 -0500
        Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-05 15:16 +0000
      Re: dealing with ClassLoaders... Josip Almasi <joe@vrspace.org> - 2014-08-08 11:53 +0200
        Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-08 18:46 +0000
          Re: dealing with ClassLoaders... Josip Almasi <joe@vrspace.org> - 2014-08-10 13:22 +0200
            Re: dealing with ClassLoaders... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-08-12 17:16 +0000

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