NPE with custom source feature id

[berndv]

public, sdk
de.innovations.mp
${b2.assemblies.public.featureId}
${b2.assemblies.public.featureId}.sources

->

[INFO] Executing bootstrapper org.sourcepit.b2:b2-maven-plugin...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Bootstrapping Model Authoring Platform Plugins for Visual Rules 6.1 2.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] ignoreXmlConfiguration == true
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-eclipse-java/6.1.1/modeler-eclipse-java-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-common/6.1.1/modeler-base-common-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-common/6.1.1/modeler-base-common-6.1.1-site-test.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-core/6.1.1/modeler-base-core-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-core/6.1.1/modeler-base-core-6.1.1-site-test.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-eclipse-core/6.1.1/modeler-eclipse-core-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-eclipse-core/6.1.1/modeler-eclipse-core-6.1.1-site-test.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-runtime/6.1.1/modeler-base-runtime-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-runtime/6.1.1/modeler-base-runtime-6.1.1-site-test.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-java/6.1.1/modeler-base-java-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-java/6.1.1/modeler-base-java-6.1.1-site-test.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-validation/6.1.1/modeler-base-validation-6.1.1-site-sdk.zip!/
[INFO] Using site jar:file:C:/Projekte/.m2/repository/de/visualrules/modeler/modeler-base-validation/6.1.1/modeler-base-validation-6.1.1-site-test.zip!/
[INFO] Building model for directory map-plugins
[INFO] Deleted 16 files
[INFO] Validating de.innovations.map.plugins.
[INFO] Quick fixes are disabled. You can enable it by setting the propety b2.validation.quickFixes.enabled=true.
[WARNING] de.innovations.mp.build.ui: Bundle will be unpacked on installation but contains '.' on the bundles classpath declaration. This may lead to naked class files after unpacking. It is recomended to build these classes in its own JAR via the bundles build.properties.
[WARNING] de.innovations.mp.properties.ui: Missing manifest entry: 'Eclipse-BundleShape: dir'. (quick fix available)
[WARNING] de.innovations.mp.properties.ui: Bundle will be unpacked on installation but contains '.' on the bundles classpath declaration. This may lead to naked class files after unpacking. It is recomended to build these classes in its own JAR via the bundles build.properties.
[ERROR] Internal error: org.sourcepit.common.utils.lang.PipedException: See initial cause for actual problem: NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: org.sourcepit.common.utils.lang.PipedException: See initial cause for actual problem:
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:168)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    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:601)
    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: org.sourcepit.common.utils.lang.PipedException: See initial cause for actual problem:
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.sourcepit.common.utils.lang.Exceptions.newInstance(Exceptions.java:105)
    at org.sourcepit.common.utils.lang.Exceptions.toPipedThrowable(Exceptions.java:98)
    at org.sourcepit.common.utils.lang.CopyOnWriteThrowablePipe.toPipedThrowable(CopyOnWriteThrowablePipe.java:89)
    at org.sourcepit.common.utils.lang.CopyOnWriteThrowablePipe.throwPipe(CopyOnWriteThrowablePipe.java:94)
    at org.sourcepit.common.utils.lang.Exceptions.throwPipe(Exceptions.java:175)
    at org.sourcepit.b2.execution.LifecyclePhase.post(LifecyclePhase.java:86)
    at org.sourcepit.b2.execution.B2LifecycleRunner$LifecyclePhases.post(B2LifecycleRunner.java:69)
    at org.sourcepit.b2.execution.B2LifecycleRunner$LifecyclePhases.post(B2LifecycleRunner.java:1)
    at org.sourcepit.b2.execution.LifecyclePhase.execute(LifecyclePhase.java:65)
    at org.sourcepit.b2.execution.B2LifecycleRunner.prepareNext(B2LifecycleRunner.java:120)
    at org.sourcepit.b2.internal.maven.B2BootstrapParticipant.beforeBuild(B2BootstrapParticipant.java:63)
    at org.sourcepit.maven.bootstrap.core.AbstractBootstrapper.performBootProject(AbstractBootstrapper.java:251)
    at org.sourcepit.maven.bootstrap.core.AbstractBootstrapper.performBootSession(AbstractBootstrapper.java:233)
    at org.sourcepit.maven.bootstrap.core.AbstractBootstrapper.executionStarted(AbstractBootstrapper.java:176)
    at org.sourcepit.maven.exec.internal.intercept.MavenExecutionInterceptor.fireExecutionStarted(MavenExecutionInterceptor.java:72)
    at org.sourcepit.maven.exec.internal.intercept.MavenExecutionInterceptor.onAfterSessionStart(MavenExecutionInterceptor.java:34)
    at org.sourcepit.maven.exec.internal.intercept.MavenLifecycleParticipant.afterSessionStart(MavenLifecycleParticipant.java:31)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:217)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    ... 11 more
Caused by: java.lang.NullPointerException
    at org.sourcepit.b2.model.builder.util.DefaultUnpackStrategy.hasDirBundleShape(DefaultUnpackStrategy.java:32)
    at org.sourcepit.b2.model.builder.util.DefaultUnpackStrategy.isUnpack(DefaultUnpackStrategy.java:27)
    at org.sourcepit.b2.internal.generator.PomGenerator.generatePluginProject(PomGenerator.java:530)
    at org.sourcepit.b2.internal.generator.PomGenerator$1.casePluginProject(PomGenerator.java:155)
    at org.sourcepit.b2.internal.generator.PomGenerator$1.casePluginProject(PomGenerator.java:1)
    at org.sourcepit.b2.model.module.util.ModuleModelSwitch.doSwitch(ModuleModelSwitch.java:222)
    at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:53)
    at org.eclipse.emf.ecore.util.Switch.doSwitch(Switch.java:69)
    at org.sourcepit.b2.internal.generator.PomGenerator.doGenerate(PomGenerator.java:187)
    at org.sourcepit.b2.internal.generator.PomGenerator.generate(PomGenerator.java:101)
    at org.sourcepit.b2.internal.generator.AbstractPomGenerator.generate(AbstractPomGenerator.java:35)
    at org.sourcepit.b2.internal.generator.B2Generator$2.doVisit(B2Generator.java:94)
    at org.sourcepit.b2.model.builder.util.ModuleWalker.visit(ModuleWalker.java:29)
    at org.sourcepit.b2.model.module.internal.util.EWalkerImpl.walk(EWalkerImpl.java:56)
    at org.sourcepit.b2.model.module.internal.util.EWalkerImpl.walk(EWalkerImpl.java:82)
    at org.sourcepit.b2.model.module.internal.util.EWalkerImpl.walk(EWalkerImpl.java:64)
    at org.sourcepit.b2.model.module.internal.util.EWalkerImpl.walk(EWalkerImpl.java:82)
    at org.sourcepit.b2.model.module.internal.util.EWalkerImpl.walk(EWalkerImpl.java:64)
    at org.sourcepit.b2.internal.generator.B2Generator.doGenerate(B2Generator.java:99)
    at org.sourcepit.b2.internal.generator.B2Generator.access$0(B2Generator.java:75)
    at org.sourcepit.b2.internal.generator.B2Generator$1.doExecute(B2Generator.java:62)
    at org.sourcepit.b2.internal.generator.B2Generator$1.doExecute(B2Generator.java:1)
    at org.sourcepit.b2.execution.LifecyclePhase.execute(LifecyclePhase.java:58)
    at org.sourcepit.b2.internal.generator.B2Generator.generate(B2Generator.java:46)
    at org.sourcepit.b2.execution.B2.generate(B2.java:69)
    at org.sourcepit.b2.execution.B2LifecycleRunner$3.doExecute(B2LifecycleRunner.java:188)
    at org.sourcepit.b2.execution.B2LifecycleRunner$3.doExecute(B2LifecycleRunner.java:1)
    at org.sourcepit.b2.execution.LifecyclePhase.execute(LifecyclePhase.java:58)
    at org.sourcepit.b2.execution.B2LifecycleRunner$1.doExecutePhases(B2LifecycleRunner.java:111)
    at org.sourcepit.b2.execution.B2LifecycleRunner$1.doExecutePhases(B2LifecycleRunner.java:1)
    at org.sourcepit.b2.execution.B2LifecycleRunner$LifecyclePhases.doExecute(B2LifecycleRunner.java:59)
    at org.sourcepit.b2.execution.B2LifecycleRunner$LifecyclePhases.doExecute(B2LifecycleRunner.java:1)
    at org.sourcepit.b2.execution.LifecyclePhase.execute(LifecyclePhase.java:58)
    ... 21 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