Java Web Start- Cannot launch Application. Pls help

Question

HI
Ia m beginner in java web start. I creaate a simple swing application and try to launch it through web start. But I failed. My application jar file (sample.jar)contains only class files. No menifest file. Then I sign my "sample.jar" file and placed inside tomcat server: "webapps/root/WebStart/Sample". I also placed the "sample.jnlp" file in the above directory.The name of my main class is :"Sample" .Here is the content of sample.jnlp:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+"
  codebase="http://165.231199.164:8080"
>
<information>
  <title>Sample Launching Test</title>
  <vendor>FMO</vendor> 
  <homepage href="www.sun.com" />
  <description>Demonstration of JNLP</description>
</information>
<offline-allowed/>
<security>
  <all-permissions/>
</security>
<resources>
  <j2se version="1.2+" />
  <jar href="/WebStart/Sample/sample.jar"/>
</resources>
<application-desc main-class="Sample" />
</jnlp>Whenever I try to launch this application from the browser , it shows me following :
An error occurred while launching/running the application.
Title: Sample Launching Test
Vendor: FMO
Category: Unexpected Error
RED
Anybody pls help me here about how to Launch my application. Am I missing something?

Answer 1

I fixed the porblem by modifying the sample.jnlp file. Here is the latest version:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase=http://[my-ip-address]:8080/WebStart/Sample>
<href="sample.jnlp">
<information>
  <title>Sample Launching Test</title>
  <vendor>FMO</vendor> 
  <homepage href="www.sun.com" />
  <description>Demonstration of JNLP</description>
  <offline-allowed/>
</information>
<security>
  <all-permissions/>
</security>
<resources>
  <j2se version=1.4+ />
  <jar href="sample.jar"/>
</resources>
<application-desc main-class="Sample" />
</jnlp>