RFC: Better Netx error message

[Omair Majid]

Hi,

Netx's error messages tend to be cryptic. For example, running javaws on 
a jnlp with missing 'title' and 'home' elements:
$ javaws Broken.jnlp
netx: null
That doesnt make it clear if javaws did anything. Perhaps it ran to 
completion? The attached patch makes the error a lot more explicit:
$ java net.sourceforge.jnlp.runtime.Boot Broken.jnlp
netx: Unexpected java.lang.NullPointerException at 
java.lang.Thread.init(Thread.java:366)

ChangeLog:
2009-05-25  Omair Majid  <omajid at redhat.com>
     * rt/net/sourceforge/jnlp/resources/Messages.properties: Add
     RUnexpected to show generic information
     * rt/net/sourceforge/jnlp/runtime/Boot.java (run): Show more
     information about the fatal exception.


Any comments?

Cheers,
Omair
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