jnlp launch file error

[Ravikanth kolli]

hi i am trying to add an application to my web page and was using jnlp. I am getting the following error

An error occurred while launching/running the application.

Category: Launch File Error

The following required field is missing from the launch file: <jnlp>

the exception that i am get

MissingFieldException[ The following required field is missing from the launch file: <jnlp>]
at com.sun.javaws.jnl.xml.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Main.main(Unknown Source)

And my jnlp file is

 <?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="c:/codebase/" href="opt.jnlp">
    <information>
        <title>Opt</title>
    </information>
     <security>
    <all-permissions/>
  </security>
    <resources>
      <j2se version="1.4+" href="http://java.sun.com/products/autodl/j2se"/>
    <jar href ="code/final_project.jar" main="true"/>
    <jar href ="code/lib/jena.jar"/>
    <jar href ="code/lib/log4j-1.2.12.jar"/>
    <jar href ="code/lib/xercesImpl.jar"/>
    <jar href ="code/lib/commons-logging-1.1.jar"/>
    <jar href ="code/lib/lucene-core-2.0.0.jar"/>
    <jar href ="code/lib/antlr-2.7.5.jar"/>
    <jar href ="code/lib/concurrent.jar"/>
    <jar href ="code/lib/icu4j_3_4.jar"/>
    <jar href ="code/lib/iri.jar"/>
    <jar href ="code/lib/json.jar"/>
    </resources>
    <application-desc main-class="opt.optima">
      
    </application-desc>
</jnlp>
   

I searched a lot for it but couldnot find a solution to this error.

thanks ranchers for your help..

[ March 26, 2008: Message edited by: Ravikanth kolli ]
[ March 26, 2008: Message edited by: Ravikanth kolli ]

[Daniel Chemko]

1. If you must use a local file system as the JNLP host, use the file:// prefix so that the file URL can properly be decoded.

2. When I correct #1, I run into this issue:

MissingFieldException[ The following required field is missing from the launch file: <jnlp><information><vendor>]

So you must specify a vendor code.

[Ravikanth kolli]

hi daniel,

I added the file:// tag in the codebase and also added the vendor information. It gave me the following error

An error occurred while launching/running the application.

Title: Opt
Vendor: Ravikanth
Category: Download Error

Unable to load resource: file://C:/codebase/opt.jnlp

Exception

JNLPException[category: Download Error : Exception: java.net.UnknownHostException: C : LaunchDesc: null ]
at com.sun.javaws.cache.DownloadProtocol$RetrieveAction.actionDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.getLaunchFile(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

i am getting the previous error when i try to run it through the web. Can you tell me what changes should i be doing for it to work?

Thanks a lot..

[Satish Atyam]

Hi Ravikanth kolli,
As per my knowledge everything is ok in your jnlp file except codebase,it is the most important tag in the jnlp file,when you depoly your jnlp application on the server you have to change your codebase tag like this

<jnlp spec="1.0+" codebase="http://Ipaddress ortno on which server running/Root folder name" href="launch.jnlp">

For ex:

<jnlp spec="1.0+" codebase="http://192.168.1.125:8080/EventProj"
href="launch.jnlp">


Just try like this.

I hope you will get now.
[ March 27, 2008: Message edited by: Satish Atyam ]

[Ravikanth kolli]

I got it guys thanks a lot..