what Java folk most commonly need are validation of JNLP files at the
various levels.

The post  where Andrew talked about his new XSD validator just
surfaced again.

I tried it out and it died immediately with a null pointer exception.

I pasted in my JNLP text and selected JNLP.

Some thoughts on how to make it easier to use:

1. make the link to start the program be a button and say "LAUNCH" or
something similar. The launch link is disguised as a simple text link.
The well formedness checker has a similar problem.

2. put a watermark over the sample screenshot. It looks too much like
the app itself already running.

3. If you need to provide your own JNLP XSD, instructions need to
guide you on the screen.

Whatever is causing this exception needs a better error message.

Error: null
java.lang.NullPointerException
    at
org.physci.xml.tool.validate.XMLValidator.parse(XMLValidator.java:324)
    at
org.physci.xml.tool.validate.XMLValidator.validateContent(XMLValidator.java:363)
    at
org.physci.xml.tool.validate.XMLValidator$ValidateWorker.doInBackground(XMLValidator.java:477)
    at
org.physci.xml.tool.validate.XMLValidator$ValidateWorker.doInBackground(XMLValidator.java:471)
    at javax.swing.SwingWorker$1.call(Unknown Source)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown
Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at javax.swing.SwingWorker.run(Unknown Source)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
    at java.lang.Thread.run(Unknown Source)

I'm glad Andrew has tackled this problem. I had it about #4 on my to
do list.

I have a problem using this. Try validating
http://mindprod.com/webstart/replicator.jnlp with
an old JNLP xsd,
http://mindprod.com/jgloss/snippet/jnlp-xml-schema.xsd

When you click on the bottom left panel in order to home in on an
error, you get a brief flash in the upper left panel, the JNLP file
being verified.  Then the cursor disappears and you can't see what it
is accompanying about. Perhaps you could select the offending text or
in some other way make it more obvious what code is causing the
trouble -- even matching lines numbers would do.

Hope that those listed there are most interesting from Sun/Java point of
view:
<http://java.sun.com/xml/ns/javaee/#2>

(Follow a bottom links on the page, there is link to commonly used DTDs
also.)

My short "wish list" for YAX-V:

  * Editable XSD pane.  (That would be helpful in quick
writing/correcting/testing XSD files.)

  * Possibility to specify the XML/XSD file also as URL.  (It would
prevent us from downloading temporary test files, which may be annoying
when for instance .jnlp is associated with JWS launcher.)

  * Support for DTD.  (Embedded DTD -> XSD Converter would be great,
but also simple validation of "rewritten XML" against a given DTD would
be useful.)

BTW -- regarding "our" JNLP schema ;), note the following quote form the
JNLP spec.:

That means a size modifiers are optional, and if present, should be in
lower-case.

So the 'memorySizeType' in current version of XSD seams to be incorrect.
 It likely should be defined as:

<xs:simpleType name="memorySizeType">
  <xs:restriction base="xs:token">
    <xs:pattern value="[0-9]+[km]?"/>
  </xs:restriction>
</xs:simpleType>

P.S.

Andrew, I've also revised again our discussions on a subjects "JNLP xsd
schema", and "Problem with .jar file", and I realized that there is my
mistake in the latter thread.  I'm sure, that I've seen one of the
earlier versions of the JNLP XSD from you, but now I see that it was not
from the post you linked there -- possibly I've seen it pointed from one
of your previous post, no matter...  That is to say only, that none of
the NNTP servers used by me feeds better than GG -- your post with
announcement of the XSD, and the one next to it asking for comments, are
both not available from my servers.  Which is simply, the "nature of
Usenet" to me...

piotr

...

<http://www.physci.org/lib.html>
<http://www.physci.org/lib.html#xsd-url>
<http://www.physci.org/lib.html#dtd-url>
<http://www.physci.org/lib.html#namedlink>

Note that neither of the first two 'demos'
works at the moment, but can be seen in the
lasyt demo.  I will look into it when I have
time.  More discussion later.

Andrew T.