Cannot add custom artifact handler and custom lifecycle as a build extension

[DEBUG] Error looking up lifecycle mapping to retrieve optional mojos. Lifecycle ID: clean. Error: Component descriptor cannot be found in the component repository: org.apache.maven.lifecycle.mapping.LifecycleMappingxar.
org.codehaus.plexus.component.repository.exception.ComponentLookupException: Component descriptor cannot be found in the component repository: org.apache.maven.lifecycle.mapping.LifecycleMappingxar.
        at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:323)
        at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:440)
        at org.apache.maven.execution.MavenSession.lookup(MavenSession.java:123)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findOptionalMojosForLifecycle(DefaultLifecycleExecutor.java:1111)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.bindLifecycleForPackaging(DefaultLifecycleExecutor.java:999)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.constructLifecycleMappings(DefaultLifecycleExecutor.java:980)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:458)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:278)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:330)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:123)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:272)
        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:585)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[DEBUG] Skipping disabled repository codehaus.plugin.snapshots
[DEBUG] Skipping disabled repository apache.snapshots
[DEBUG] maven-clean-plugin: resolved to version 2.1 from repository central
[DEBUG] Retrieving parent-POM: org.apache.maven.plugins:maven-plugin-parent::2.0 for project: null:maven-clean-plugin:maven-plugin:2.1 from the repository.
[DEBUG] org.apache.maven.plugins:maven-clean-plugin:maven-plugin:2.1:runtime (selected for runtime)
[DEBUG]   org.apache.maven:maven-plugin-api:jar:2.0:runtime (selected for runtime)
[DEBUG] Retrieving parent-POM: org.apache.maven.shared:shared-components-parent::1 for project: null:file-management:jar:1.0 from the repository.
[DEBUG]   org.apache.maven.shared:file-management:jar:1.0:runtime (selected for runtime)
[DEBUG]     org.codehaus.plexus:plexus-utils:jar:1.0.4:runtime (selected for runtime)
[DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-clean-plugin:2.1:clean' -->
[DEBUG]   (f) directory = /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target
[DEBUG]   (f) outputDirectory = /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target/classes
[DEBUG]   (f) testOutputDirectory = /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target/test-classes
[DEBUG] -- end configuration --
[INFO] [clean:clean]
[INFO] Deleting directory /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target
[DEBUG] Found deletable paths: []
[INFO] Deleting directory /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target/classes
[DEBUG] Found deletable paths: []
[INFO] Deleting directory /Users/vmassol/dev/maven/trunks/core-integration-testing/core-integration-tests/src/test/resources/it0115-customArtifactHandlerAndCustomLifecycle/test-project/target/test-classes
[DEBUG] Found deletable paths: []
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Cannot find lifecycle mapping for packaging: 'xar'.
Component descriptor cannot be found in the component repository: org.apache.maven.lifecycle.mapping.LifecycleMappingxar.
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Cannot find lifecycle mapping for packaging: 'xar'.
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findMappingsForLifecycle(DefaultLifecycleExecutor.java:1071)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.bindLifecycleForPackaging(DefaultLifecycleExecutor.java:997)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.constructLifecycleMappings(DefaultLifecycleExecutor.java:980)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:458)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:278)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:330)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:123)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:272)
        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:585)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.codehaus.plexus.component.repository.exception.ComponentLookupException: Component descriptor cannot be found in the component repository: org.apache.maven.lifecycle.mapping.LifecycleMappingxar.
        at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:323)
        at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:440)
        at org.apache.maven.execution.MavenSession.lookup(MavenSession.java:123)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findMappingsForLifecycle(DefaultLifecycleExecutor.java:1064)
        ... 17 more