I have found a work-around to obviate the NPE. Nevertheless, I feel
that the GAE/J SDK 1.3.1 has introduced an issue which did not exist
in previous versions.
I have raised Google App Engine issue 2793 (Dev server web XML
validation NPE for empty "welcome-file-list" tag) to detail the
problem and my work-around. The link to this issue is:
http://code.google.com/p/googleappengine/issues/detail?id=2793&can=6&sort=-id&colspec=ID%20Type%20Status%20Priority%20Stars%20Owner%20Summary%20Log%20Component
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