The URLClassLoader may be the smartest one in Java at all.
Of course it does. It loads classe that are:
1. classes of inner members (fielsd).
2. classes taht are return-types of methods.
3. classes, that are parameter of methods.
It does not load classes, that are not directly used. I.e.
If your applet has a statement like
Class.forName("org.apache.log4j.Logger") the org.apache.log4j.Logegr class
is not loaded. And when you try to load the class that way you will get a
ClassNotFoundException, because Class.forname() uses BootStrap CL.
Solution: use
Thread.currentThread().getContextClassLoader().loadClass()...
Better off: this.getClass().getClassLoader().loadClass().
Try and learn that is my motto.
Lachezar
> HI,
>
> thanks for your reply.
>
> I don't know that much about on-the-fly class loading.
>
> Is it smart enought to know that if I load a class (A) that uses another
> class (B), it will load both class A and B ?
>
>
> thanks,
> ionel
>
> Lachezar Dobrev wrote:
>
> > You can always decompress the jars on the Web-Server.
> > Then the classes will be downloaded on request, which will not lower
down
> >the download size (it is getting bigger), but will make asynchronous
class
> >download available.
> > I.E. The Applet loads some boot-classes to run the applet. When there
is
> >need to get the JMS classes it will query the server for these classes.
> > This is best in case that you use limited J2EE functionality (as you
> >mentioned just JMS) but don't know which classes are required.
> >
> > Reffer to the HTML Applet tag documentation on how to set up the
directory
> >styructure for that.
> >
> > lachezar
> >
> >>Hi,
> >>
> >>In an Applet framework unsing the JMS, there are 6 packages to download
> >>(jboss-common-client.jar, jbossmq-client.jar, jnp-client.jar, log4j.jar,
> >>concurrent.jar and jboss-j2ee.jar) plus the needed classes for my app.
> >>
> >>Its then a "little" 940kb to be downloaded by the client. As some users
> >>have slow connection, is it possible to decrease this amount ?
> >>
> >>I'm using JavaWebStart for another project but I'd like this one to be
> >>100% web available.
> >>
> >>thanks,
> >>ionel
> >>
> >>
> >>
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