[tycho-user] What causes "Could not determine SWT implementation fragmen

[Aaron Digulla <digulla@xxxxxxxx>]

Hello,

I'm one step further converting our PDE project to Tycho. This time,  
SWT causes my grief. When I run the build, I get this error:

Caused by: java.lang.RuntimeException: Could not determine SWT  
implementation fragment bundle
        at  
org.eclipse.tycho.p2.impl.resolver.ProjectorResolutionStrategy.fixSWT(ProjectorResolutionStrategy.java:151)
        at  
org.eclipse.tycho.p2.impl.resolver.ProjectorResolutionStrategy.resolve(ProjectorResolutionStrategy.java:110)

I have the delta pack in the p2 repo which is used for the build and I  
have environments defined but no target platform. I use a target  
platform to fill my p2 mirror but I can't use that because p2's fucked  
up caching causes 15-20 minute delays during the build.

What causes the error? From the source, I see:

    if ( iu.getId().startsWith( "org.eclipse.swt" )
      && isApplicable( newSelectionContext, iu.getFilter() ) )

It seems that either the filter or the "newSelectionContext" is wrong  
somehow. What should be in there and how do I get it in there from my  
POM?

Note that the build should work automatically on Linux and Windows  
without any special command line options to Maven (so "mvn install"  
must just work on any environment).

Also note that I'm not building a product but a simple UI plugin so  
the RCP examples are not very useful for me.

Regards,

--
Aaron "Optimizer" Digulla a.k.a. Philmann Dark
"It's not the universe that's limited, it's our imagination.
Follow me and I'll show you something beyond the limits."
http://www.pdark.de/                   http://blog.pdark.de/