I think the "target/p2artifacts.xml" and "target/p2content.xml" files
are generated by Maven. They are well-formed XML but Eclipse's XML
validator legitimately warns that they lack grammar constraints.
Since we're not maintaining the tool that creates these files, we are
not in a position to do anything about that. Therefore, we may as
well exclude these from validation entirely. That way we can
more-clearly recognize warnings that we *can* do something about.
Eclipse validation warns about invalid HTML content in all
Maven-generated "target/site/dependency-convergence.html" files. The
warnings are legitimate: these HTML files are indeed invalid.
However, we don't maintain the tool that generates these files, so we
are not in a position to fix them. Better, therefore, to suppress
these warnings so that we can notice and fix other problems over which
we do have control.
In general, the WALA code base is not really ready for nullness
checking. It would be nice if we got there some day, but I'm not
planning to take that on now or any time soon. Until then, it's not
useful to warn about missing @NonNullByDefault declarations on WALA
packages.
See also older commit 7b6811b.
Eclipse Mars Service Release 2 finds 45 potential null pointer accesses
across WALA's various Eclipse projects. Eclipse ignores these by
default, but any individual user may have changed their personal Eclipse
configuration to treat them as warnings or errors. Thus, some people
will find that the code builds while others find that it fails. Better
to explicitly use a known-good configuration.
In the long run someone should inspect these cases one-by-one and fix
them where appropriate. But that is probably better managed as part of a
larger effort to tidy up nulls in WALA. I'm not planning to take that on
now or any time soon, though, so this is a better setup for now.
Ben Liblit
Manu Sridharan
sjfink