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Re: Packages and Reflection in an Applet

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On 5/5/2012 1:25 AM, Richard Maher wrote:
> I have an unsigned Applet that needs to obtain a Username/Password from the
> user (via generic dialog boxes outside of the web-page) and optionally, on
> successful login, display some "welcome" info from the server. To that end,
> I have come up with a rudimentary AWT interface that pops-up a couple of
> modal dialogue boxes. (There is also a "status" window that has bytes
> received/sent etc).

Why not use Swing instead of AWT?

Or maybe even do it the Java 8 way with JavaFX?

> So, I have the default, fallback, rough-as-guts option for obtaining user
> credentials but would like to allow the consumers of my Applet to override
> the default and supply their own much slicker +/- localized UI. So I have
> the simple interface below that each prospective UI class must implement but
> I don't know what part packages/protection play in this scenario as well as
> reflection. If there are any people here with direct experience of the
> following conditions/questions I would be very grateful for their advice: -
>
> 1) Can a class loaded via Reflection (eg: myInter localGUI =
> (myInter)(class.forName("appletParameter").newInstance())) be in the same
> Package, and enjoy the benefits/protection of same, as the caller? Ideally
> here, the methods/variables/properties of the newly loaded class (albeit
> under the restriction of being loaded from the same codebase) being package
> private and not public? Again ideally, I do not want the methods in this GUI
> to be accessible from JavaScript but obviously accessible from my applet.

The loaded class can certainly be in the same package as the caller.

> 2) I'd expect the "tier3Client" implementing class (and any additional
> classes) to be supplied in a separate archive/JAR file and this will be
> located via the "archive=a,b,c" specifier (with "codebase_lookup" set to
> false). My "understanding" is that class.forName() will use the same
> classloader as the Applet and therefore I'm hoping that it will happily
> search through all specified JAR files looking for the requested class?

If you do not specify a classloader in the forName call (there is an
overload for that), then you will get the current classes classloader.

> 3) Are there any other restrictions/requirements or wil this just not work?

Will their jar and your jar be loaded from the same location?

Arne

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Thread

Packages and Reflection in an Applet "Richard Maher" <maher_rj@hotspamnotmail.com> - 2012-05-05 13:25 +0800
  Re: Packages and Reflection in an Applet Arne Vajhøj <arne@vajhoej.dk> - 2012-05-05 17:30 -0400
    Re: Packages and Reflection in an Applet "Richard Maher" <maher_rj@hotspamnotmail.com> - 2012-05-07 20:47 +0800
      Re: Packages and Reflection in an Applet Arne Vajhøj <arne@vajhoej.dk> - 2012-05-08 22:14 -0400
  Re: Packages and Reflection in an Applet markspace <-@.> - 2012-05-05 14:45 -0700
    Re: Packages and Reflection in an Applet "Richard Maher" <maher_rj@hotspamnotmail.com> - 2012-05-07 20:54 +0800
      [OT] Poster's name (Was: Packages and Reflection in an Applet) Lew <noone@lewscanon.com> - 2012-05-08 05:32 -0700
        Re: [OT] Poster's name (Was: Packages and Reflection in an Applet) markspace <-@.> - 2012-05-08 07:43 -0700
          Re: [OT] Poster's name (Was: Packages and Reflection in an Applet) Jan Burse <janburse@fastmail.fm> - 2012-05-08 17:02 +0200
          Re: [OT] Poster's name (Was: Packages and Reflection in an Applet) Gene Wirchenko <genew@ocis.net> - 2012-05-08 09:26 -0700

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