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[tycho-user] Building eclipse update sites with multiple versions of a feature 
I've been working on using tycho (0.10.0) to automate the build for an
eclipse plugin, but I'm having issues in building an eclipse update site
which contains more than one version of a feature.   It will build fine
of my site.xml contains:

<?xml version="1.0" encoding="UTF-8"?>
<site>
    <feature url="com.overstock.maven.apt.configurator.feature_2.0.0"
             id="com.overstock.maven.apt.configurator.feature"
             version="2.0.0"/>
</site>

or

<?xml version="1.0" encoding="UTF-8"?>
<site>
    <feature url="com.overstock.maven.apt.configurator.feature_2.0.1"
             id="com.overstock.maven.apt.configurator.feature"
             version="2.0.1"/>
</site>

However, if I try to combine both versions into one site:

<site>
    <feature url="com.overstock.maven.apt.configurator.feature_2.0.0"
             id="com.overstock.maven.apt.configurator.feature"
             version="2.0.0"/>
    <feature url="com.overstock.maven.apt.configurator.feature_2.0.1"
             id="com.overstock.maven.apt.configurator.feature"
             version="2.0.1"/>
</site>

then tycho complains about having competing versions:

[INFO] Cannot complete the request.  Generating details.
[INFO] {org.osgi.framework.executionenvironment=OSGi/Minimum-1.0,OSGi/Minimum-1.1, osgi.ws=gtk, osgi.arch=x86, osgi.os=linux, org.eclipse.update.install.features=true, org.osgi.framework.system.packages=}
[INFO] [Software being installed: com.overstock.maven.apt.configurator.site 2.0.1, Only one of the following can be installed at once: [com.overstock.maven.apt.configurator.feature.feature.jar 2.0.1, com.overstock.maven.apt.configurator.feature.feature.jar 2.0.0], Cannot satisfy dependency: com.overstock.maven.apt.configurator.feature.feature.group 2.0.0 depends on: com.overstock.maven.apt.configurator.feature.feature.jar [2.0.0], Cannot satisfy dependency: com.overstock.maven.apt.configurator.feature.feature.group 2.0.1 depends on: com.overstock.maven.apt.configurator.feature.feature.jar [2.0.1], Cannot satisfy dependency: com.overstock.maven.apt.configurator.site 2.0.1 depends on: com.overstock.maven.apt.configurator.feature.feature.group [2.0.0,2.0.1), Cannot satisfy dependency: com.overstock.maven.apt.configurator.site 2.0.1 depends on: com.overstock.maven.apt.configurator.feature.feature.group [2.0.1,2.0.2)]
[ERROR] Internal error: java.lang.RuntimeException: org.eclipse.equinox.p2.core.ProvisionException: No solution found because the problem is unsatisfiable. ->   [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: org.eclipse.equinox.p2.core.ProvisionException: 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:57)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:616)
       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: org.eclipse.equinox.p2.core.ProvisionException: No solution found because the problem is unsatisfiable.
       at org.sonatype.tycho.p2.impl.resolver.ProjectorResolutionStrategy.resolve(ProjectorResolutionStrategy.java:98)
       at org.sonatype.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:335)
       at org.sonatype.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:300)
       at org.sonatype.tycho.p2.facade.P2TargetPlatformResolver.doResolvePlatform(P2TargetPlatformResolver.java:406)
       at org.sonatype.tycho.p2.facade.P2TargetPlatformResolver.resolvePlatform(P2TargetPlatformResolver.java:105)
       at org.codehaus.tycho.resolver.DefaultTychoDependencyResolver.resolveProject(DefaultTychoDependencyResolver.java:68)
       at org.codehaus.tycho.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:94)
       at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:273)
       at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
       ... 11 more
Caused by: org.eclipse.equinox.p2.core.ProvisionException: No solution found because the problem is unsatisfiable.
       ... 20 more

Am I doing something wrong, or is this currently a limitation of tycho?

   - Ian Robertson




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