I just tried it on my Windows system but it worked as expected.
Perhaps an earlier version was broken?

Does it still not work for you?

On linux the JNLP doesn't work. Downloading the jar file specified in the jnlp
and running java -cp hudson.jar JNLPMain works fine though.

I could not run the JNLP on my Mac (OSX 10.4). I've added a slash to the URL in
the jnlp file <jar href="http://x.x.x.x:8080/jnlpJars/remoting.jar/"></jar> Then
I could run it fine using javaws.

Using "curl" or the Safari browser on the Mac the original URL without slash did
not work either. With an added slash it worked fine.

> I could not run the JNLP on my Mac (OSX 10.4). I've added a slash to the URL
> in the jnlp file <jar href="http://x.x.x.x:8080/jnlpJars/remoting.jar/">...

Ooops, sorry! I experienced problems starting a JNLP-slave on a Mac, not when
test driving!

It fails for me too. Using Vista/jre1.6.0_07/Firefox

winstone.WinstoneException: The warfile supplied is unavailable or invalid
(C:\Users\redacted_user\Documents\Downloads)
at winstone.HostConfiguration.getWebRoot(HostConfiguration.java:214)
at winstone.HostConfiguration.<init>(HostConfiguration.java:73)
at winstone.HostGroup.initHost(HostGroup.java:85)
at winstone.HostGroup.<init>(HostGroup.java:45)
at winstone.Launcher.<init>(Launcher.java:196)
at winstone.Launcher.main(Launcher.java:391)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at Main.main(Main.java:70)
at JNLPMain.main(JNLPMain.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Still broken for me. Looks bad because you are offered to "test drive" Hudson
but then you cannot.

Code changed in hudson
User: : jglick
Path:
trunk/hudson/extras/executable-war/src/main/java/Main.java
http://fisheye4.cenqua.com/changelog/hudson/?cs=15682
Log:
[FIXED JENKINS-2326] I once was lost but now I'm found.