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JNLP Problems: FileOpenService uninitialized

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I'm getting an UnavailableServiceException with the message"uninitialized" 
when I try to invoke the JNLP FileOpenService. 

At the suggestion of the Java Tutorial section on File Choosers, I'm trying 
to play with the JNLP file choosers for an application that will run in 
Java Web Start. I'm using Eclipse 3.7 and have the jnlp.jar as an external 
jar accessible to the project. The code compiles fine but the exception 
occurs when I execute this code:

try {
    fos = (FileOpenService)ServiceManager.lookup
("javax.jnlp.FileOpenService"); 
    } catch (UnavailableServiceException exc) {
       	System.err.println("FileOpenService failed. Message: " + 
exc.getMessage());
            exc.printStackTrace();
    }

As far as I can tell from the JNLP guides I've found, there's nothing wrong 
with the code itself. I've googled and found other people who have asked 
about the same problem but there are no solutions posted for any of them. 

I've never worked with JNLP so I'm guessing that I haven't got something 
set up correctly but I'm darned if I can figure out what I've done wrong.

Does anyone with JNLP/JWS experience have any suggestions on what I can do 
to resolve this problem?

 
-- 
Novice

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Thread

JNLP Problems: FileOpenService uninitialized Novice <novice@example..com> - 2012-01-27 19:48 +0000
  Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-01-27 16:35 -0500
    Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-01-27 17:22 -0500
      Re: JNLP Problems: FileOpenService uninitialized Novice <novice@example..com> - 2012-01-28 15:03 +0000
        Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-01-28 11:56 -0500
          Re: JNLP Problems: FileOpenService uninitialized Novice <novice@example..com> - 2012-02-01 18:19 +0000
            Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-02-01 17:17 -0500
              Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-02-01 20:03 -0500
            Re: JNLP Problems: FileOpenService uninitialized Jeff Higgins <jeff@invalid.invalid> - 2012-02-03 15:31 -0500

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