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Article View: comp.lang.java.gui
Article #23

Re: NullPointerException???!!!

#23
From: Xinyi Xu
Date: Tue, 23 Mar 1999 00:00
80 lines
3210 bytes
It is because that you use borland.jbcl.control.ImageControl.* package which
is not supported by Java-Plugin 1.2.  After it throws the
NullPointerException, it stops to execute the remaining codes, that is why
you can only see partial your applet.

Xinyi

Daniel wrote:

> Hi,
>
> I've problems to run an applet with netscape4.5 JDK1.1.2 Plugin.
> I'm working with JBuilder1. Netscape only show me a part of the headbar,
> but not the whole GUI-frame, what can be wrong?
> Here are the html-File and the JavaConsoleWindow. If anybody can help
> me, thanks a lot.
> Daniel
>
> html-file:
>
> <HTML>
> <HEAD>
>    <META HTTP-EQUIV="Content-Type" CONTENT="text/html;
> charset=iso-8859-1">
>    <META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (WinNT; I)
> [Netscape]">
>    <TITLE>HTML Test Page
> </TITLE>
> </HEAD>
> <BODY>
> The Graphical-User-Interface will appear below in a Java enabled
> browser.
> <BR><APPLET
>   CODEBASE = "myclasses/archive"
>   ARCHIVE  = "jbcl-rt.zip, jclass.zip, jgl.zip"
>   CODE     = "GUI.class"
>   NAME     = "TestApplet"
>   WIDTH    = 400
>   HEIGHT   = 300
>   HSPACE   = 0
>   VSPACE   = 0
>   ALIGN    = middle
> ></APPLET>
> </BODY>
> </HTML>
>
> JavaConsoleWindow:
>
> java.lang.NullPointerException
>
>   at sun.awt.windows.WToolkit.prepareScrImage(Compiled Code)
>
>   at sun.awt.windows.WToolkit.prepareImage(Compiled Code)
>
>   at java.awt.Component.prepareImage(Compiled Code)
>
>   at java.awt.Component.prepareImage(Compiled Code)
>
>   at borland.jbcl.control.ImageControl.setupImage(Compiled Code)
>
>   at borland.jbcl.control.ImageControl.setImageName(Compiled Code)
>
> * at Login.jbInit(Compiled Code)
>
>   at Login.<init>(Compiled Code)
>
>   at GUI.start(Compiled Code)
>
>   at
> netscape.applet.DerivedAppletFrame$StartAppletEvent.dispatch(Compiled
> Code)
>
>   at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
> Code)
>
>   at java.awt.EventDispatchThread.run(Compiled Code)
>
>   at
> netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
> Code)
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From: Xinyi Xu <xux@msx.upmc.edu>
Subject: Re: NullPointerException???!!!
Date: 1999/03/23
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