Time to remove Xerces/Xalan dep from V3 POMs?

[Ian Young]

On 20 Jan 2014, at 16:42, Cantor, Scott <cantor.2 at osu.edu> wrote:

> I believe we've had prior discussions about intending to eliminate the
> requirement to endorse those jars and start supporting JAXP out of the box
> in the next version, but we haven't made the changes yet in the POMs. I
> think we should start testing and developing that way sooner rather than
> later.

+1

> I'm not sure if we need to explicitly reference the JAXP APIs the way we
> do for JSON and other things, since we're targeting Java 7 only, but I
> think we probably might want to to baseline the JAXP version we're
> depending on.

Per http://en.wikipedia.org/wiki/JAXP:

> J2SE versionJAXP version bundled

> 
> 1.4	1.1
> 1.5	1.3
> 1.6	1.4
> 1.7.0	1.4.5
> 1.7.40	1.5

So, annoyingly, they switched JAXP version supported in the middle of Java 7, so there's a live issue as to whether we can assume JAXP 1.5 or not.

I experimented a bit with the MDA (because if I am using the old endorsed libraries I run into trouble with the new SchemaBuilder) and at least for the uses I have there, there is no need to include any dependencies explicitly.

I only ran up against two functional problems when I ripped those dependencies out:

* One place where some half-baked (now deleted) code was explicitly referencing an internal Xalan class

* A couple of places in tests where java-support's DomTypeSupport#longToDuration (to become DOMTypeSupport, I suppose) returned a more verbose but still valid result:

   java.lang.AssertionError: expected [PT16M27.654S] but found [P0Y0M0DT0H16M27.654S]

So Xalan was apparently taking some care to suppress zero fields in Duration.toString() where the current Java 7 runtime is not. I should obviously make the test classes more flexible to allow for variation here.

I'm not by any means saying that's all we'll see, but it probably bodes well that I didn't end up with lots more.

	-- Ian



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