Description Timo Rohrberg 2011-10-07 08:09:57 EDT

Build Identifier: M20110909-1335

Trying to build an Eclipse feature listing platform-specific fragments for different platforms than the current one fails with the following resolution problem:

[INFO] Cannot complete the request.  Generating details.
[INFO] Cannot complete the request.  Generating details.
[INFO] {org.osgi.framework.executionenvironment=OSGi/Minimum-1.0,OSGi/Minimum-1.1, osgi.ws=win32, osgi.arch=x86, osgi.os=win32, org.eclipse.update.install.features=true, org.osgi.framework.system.packages=}
[ERROR] Cannot resolve project dependencies:
[ERROR]   Software being installed: com.example.feature.feature.group 1.0.0.qualifier
[ERROR]   Missing requirement: com.example.feature.feature.group 1.0.0.qualifier requires 'org.eclipse.equinox.launcher.win32.win32.x86_64 0.0.0' but it could not be found
[ERROR] 
[ERROR] Internal error: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.equinox.launcher.win32.win32.x86_64 0.0.0.", "Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.swt.win32.win32.x86_64 0.0.0.", "No solution found because the problem is unsatisfiable."] -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.equinox.launcher.win32.win32.x86_64 0.0.0.", "Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.swt.win32.win32.x86_64 0.0.0.", "No solution found because the problem is unsatisfiable."]
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:168)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:534)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.equinox.launcher.win32.win32.x86_64 0.0.0.", "Unable to satisfy dependency from com.example.feature.feature.group 1.0.0.qualifier to org.eclipse.swt.win32.win32.x86_64 0.0.0.", "No solution found because the problem is unsatisfiable."]
	at org.eclipse.tycho.p2.impl.resolver.ProjectorResolutionStrategy.resolve(ProjectorResolutionStrategy.java:106)
	at org.eclipse.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:102)
	at org.eclipse.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:69)
	at org.eclipse.tycho.p2.resolver.P2TargetPlatformResolver.doResolvePlatform(P2TargetPlatformResolver.java:342)
	at org.eclipse.tycho.p2.resolver.P2TargetPlatformResolver.resolvePlatform(P2TargetPlatformResolver.java:162)
	at org.eclipse.tycho.core.resolver.DefaultTychoDependencyResolver.resolveProject(DefaultTychoDependencyResolver.java:85)
	at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:91)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:273)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	... 11 more
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException

This happens even if the platforms for which to resolve plugins are specified in the pom.xml as follows:

<plugin>
  <groupId>org.eclipse.tycho</groupId>
  <artifactId>target-platform-configuration</artifactId>
  <version>${tycho-version}</version>
  <configuration>
    <resolver>p2</resolver>
    <environments>
      <environment>
        <os>win32</os>
        <ws>win32</ws>
        <arch>x86</arch>
      </environment>
      <environment>
        <os>win32</os>
        <ws>win32</ws>
        <arch>x86_64</arch>
      </environment>
    </environments>
  </configuration>
</plugin>

It seems tycho only uses the IUs for the platform which is defined first:

[INFO] {org.osgi.framework.executionenvironment=OSGi/Minimum-1.0,OSGi/Minimum-1.1, osgi.ws=win32, osgi.arch=x86, osgi.os=win32, org.eclipse.update.install.features=true, org.osgi.framework.system.packages=}

I did not find a way to tell tycho to resolve the IUs for *both* platforms defined, i.e. x86 *and* x86_64. See the attached projects to reproduce the error.

Reproducible: Always

Steps to Reproduce:
1. Extract the attached projects into a new workspace.
2. Run Maven - Install on com.example.parent. This works.
3. Run maven - Install on com.example.feature. This fails with the error described above.