This is what Benoit Moussaud had to say on precisely this issue:
In order to use TExtPaneAppender with JavaWebStart,
I have modified this file, in particular the loadIcon method,
public /*static*/ Image loadIcon ( String path ) {
Image img = null;
try {
ClassLoader classload = this.getClass().getClassLoader();
URL url = classload.getResource(path);
img = (Image) (Toolkit.getDefaultToolkit()).getImage(url);
} catch (Exception e) {
System.out.println("Exception occured: " + e.getMessage() + " - " + e );
}
return (img);
}
I have following JavaWebStart developper guide to load the resource
Retrieving Resources from JAR files
Java Web Start only transfers JAR files from the Web server to the client
machine. It determines where to store the JAR files on the local machine.
Thus, an application cannot use disk-relative references to resources such
as images and configuration files.
All application resources must be retrieved from the JAR files specified in
the resources section of the JNLP file, or retrieved explicitly using an
HTTP request to the Web server. We recommend storing resources in JAR files,
since they will be cached on the local machine by Java Web Start.
The following code example shows how to retrieve images from a JAR file:
// Get current classloader
ClassLoader cl = this.getClass().getClassLoader();
// Create icons
Icon saveIcon = new ImageIcon(cl.getResource("images/save.gif"));
Icon cutIcon = new ImageIcon(cl.getResource("images/cut.gif"));
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Benoit Moussaud - [EMAIL PROTECTED]
CTS - Cril Telecom Software
http://www.criltelecom.com
8 rue danjou
92517 Boulogne Billancourt - France
Tel: 01 58 17 04 78
At 10:17 15.02.2001 -0500, you wrote:
>I want to use the GUI TextPaneAppender to look at the log files, but I am
>encountering
>errors when it tries to load the icons, specifically, the error happens at
>
>log4j:ERROR Could not create an Appender. Reported error follows.
>java.lang.NullPointerException
> at javax.swing.ImageIcon.<init>(Unknown Source)
> at
>org.apache.log4j.gui.TextPaneAppender.createIcons(TextPaneAppender.java:133)
>
>Any ideas?
>
>Leon
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