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[tycho-user] Error during build because of optional feature

In my product I want to include marketplace feature
(org.eclipse.epp.mpc). I am building for both Eclipse 3.5 and 3.7,
since 3.5 does not support marketplace I marked this feature as
optional. During the build Eclispe 3.5 fails with the following error:

Stack trace :
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to
execute goal org.eclipse.tycho:tycho-packaging-plugin:0.16.0:package-feature
(default-package-feature) on project
com.iwaysoftware.integration.tools.p2.feature: Execution
default-package-feature of goal
org.eclipse.tycho:tycho-packaging-plugin:0.16.0:package-feature
failed: Could not resolve feature org.eclipse.epp.mpc_0.0.0; Path to
dependency:

	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)
	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.launchStandard(Launcher.java:329)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
	at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:158)
	at hudson.maven.Maven3Builder.call(Maven3Builder.java:98)
	at hudson.maven.Maven3Builder.call(Maven3Builder.java:64)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
default-package-feature of goal
org.eclipse.tycho:tycho-packaging-plugin:0.16.0:package-feature
failed: Could not resolve feature org.eclipse.epp.mpc_0.0.0; Path to
dependency:

	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 27 more
Caused by: java.lang.RuntimeException: Could not resolve feature
org.eclipse.epp.mpc_0.0.0; Path to dependency:

	at org.eclipse.tycho.core.ArtifactDependencyVisitor.newRuntimeException(ArtifactDependencyVisitor.java:42)
	at org.eclipse.tycho.core.ArtifactDependencyVisitor.missingFeature(ArtifactDependencyVisitor.java:29)
	at org.eclipse.tycho.core.osgitools.AbstractArtifactDependencyWalker.traverseFeature(AbstractArtifactDependencyWalker.java:188)
	at org.eclipse.tycho.core.osgitools.AbstractArtifactDependencyWalker.traverseFeature(AbstractArtifactDependencyWalker.java:90)
	at org.eclipse.tycho.core.osgitools.AbstractArtifactDependencyWalker.traverseFeature(AbstractArtifactDependencyWalker.java:63)
	at org.eclipse.tycho.packaging.FeatureXmlTransformer.transform(FeatureXmlTransformer.java:47)
	at org.eclipse.tycho.packaging.PackageFeatureMojo.expandVersionQualifiers(PackageFeatureMojo.java:300)
	at org.eclipse.tycho.packaging.PackageFeatureMojo.execute(PackageFeatureMojo.java:120)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	... 28 more

I also tried adding p2.inf instruction with and without optional feature:

requires.0.namespace=org.eclipse.equinox.p2.iu
requires.0.name=org.eclipse.epp.mpc
requires.0.optional=true

but still same error.

Is something wrong with how I am referencing my feature?

Thanks,
Alex


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