As part of Tycho's eclipserun plugin, you need to specify a repository for 
Tycho (and p2) to fetch components from. Tycho starts off with a minimal 
set, and then you can add more IUs for constructing a minimal "eclipse 
runtime" that is needed for your task. 

In M2, we introduced a bug that causes some "minimal sets" of bundles to 
not run.

We in our platform builds discovered this problem, (bug 478984 [1]) and 
now I have heard of another project that has hit the same problem (WTP, in 
bug 479805 [2] ) so I thought best to warn others. 

The easiest fix is to use, instead of M2, the first I build with the fix, 
I20151006-0800. I recommend that one, simply because it is closest to M2 
and it has been used successfully for this task. You never can tell, 
subsequent I-builds might have other bugs. :/ 

I could not reproduce the problem with a minimal pom, and a minimal 
eclipserun task (using antRunner with a "Hello World" ant task) so it 
might not always occur, but we've seen it with producing JavaDoc, and for 
the generation API descriptions. 

The issue might very well manifest itself in other situations (other than 
building) where a "minimal set" of components are crafted. 

Thanks for reading and apologies for the bug and this late notification of 
it. 

[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=478984
[2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=479805




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