[m2e-users] Maven -> Update Project Configuration

[Steve Cohen <scohen@xxxxxxxxxxxxxxx>]

I had made a couple of changes to my settings.xml, basically to add a 
new plugin repository, which affected one workspace I was working in and 
not another which had a lot of existing code that had previously worked.

When I reopened this workspace, many projects were flagged with the 
"need to update project configuration' error, so I updated.  This left 
uncompilable code.  In some cases, this was probably a good thing as the 
compiler options were not in synch, indicating holes in my setup and 
easily fixed.

But in one annoying case that I can find no justification for, the 
process inserted a JAXRS-builder into my project file.  (Sorry I cannot 
be more exact than that, I can no longer regenerate this configuration). 
The project in question does not depend on building JAXRS although one 
of its dependent modules did.  The project would not build without my 
manually removing this builder from the .project file, throwing a Null 
Pointer exception.  After removing this unwanted builder, no problem.

I did try to run Update Project Configuration again and this time it did 
not insert the JAXRS builder.

Ironically, prior to this misadventure, I had been irritated by the fact 
that m2e would not let the project build until the configuration was 
resynched, and then when the resynch occurred, it had always worked, so 
I thought, why not make this process automatic?  I guess this is my 
answer.  This is a more complex project than the ones I'd previously 
been playing with and there are still a few bugs to work out in the updater.