Failing while initializing static data

Question

hie all!
i'm making a jar file using build.xml configuration.
<target name="makejar">
<jar destfile="${lib.dir}/${jar.name}" basedir="${base}/bin/">
<manifest>
<attribute name="Main-Class" value="${jar.main-class}"/>
<attribute name="Class-Path" value="1.jar 2.jar 3.jar 4.jar"/>
</manifest>
<fileset dir="${lib.dir}"/>
</jar>
</target>
Now, in the main class, i m creating static icon as:
new ImageIcon(new Object().getClass().
getResource("/mypackage/icons/pid.gif"));
But i when i execute the jar : java -jar my.jar
it fails with NullPointerException at javax.swing.ImageIcon(Url) construtor.
The icons are inside the package.
How can i resolve getting URL object for the icons?
One more thing is that ... the jar files are inside this my.jar
Upon looking at few messages, i saw, we need to unjar the jar to use
the jar files inside it.
But, then how can i use my jar for webstart demonstration, which is the ultimate purpose.
Please give your valuable suggestions about the mentioned problems.
Thanks and Regards,
Giriraj

Answer 1

Assuming you have the following package structure.
\mypackage
...my.jar
...other1.jar
...other2.jar
...\icons
......pid.gif
Try
// note only the path under the root with no leading slash.
new ImageIcon(getClass().getResource("icons/pid.gif"));The other jar files will not work if they are inside your jar "my.jar";
Just place the other jars in the same directory as your jar and they will be automatically downloaded.
Note you will need the other jars listed in your manifest class-path.
Class-Path: . icons/ other1.jar other2.jar
Note the jars must also be in your JNLP
<resources>
    <j2se version="1.4+"/>
    <jar href="my.jar"/>
    <jar href="other1.jar"/>
    <jar href="other2.jar"/>
</resources>rykk