MavenCli com.google.inject.internal.util.ComputationException: java.lang.NoClassDefFoundError: org/apache/maven/plugin/descriptor/MojoDescriptor

I want to use MavenCli in order to use Maven programatically within an installer (IzPack).

pom.xml (see attachment).

I'm using

<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-embedder</artifactId>
<version>3.0-beta-3</version>
</dependency>

Note that all dependencies are unzipped and part of the final installer jar (target/product-installer.jar). The components.xml contains all available components.xml files (merged by plexus-component-metadata plugin).

how to build: mvn -X clean install > build.log

At runtime (java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address="8000" -jar target/wigeoweb-installer.jar) following code is executed:

MavenCli cli = new MavenCli();
int result = cli.doMain(new String[]

,
"C:/Develop/Experiments/webservercontext-maven-plugin", //Own plugin
System.out, System.out);
System.out.println("result: " + result);

It terminates with exception while initializing plexus container (there's the place where the debugger exits):

Exception:

Listening for transport dt_socket at address: 8000
[ERROR] Error executing Maven.
[ERROR] com.google.inject.internal.util.ComputationException: java.lang.NoClassDefFoundError: org/apache/maven/plugin/descriptor/MojoDescriptor
[ERROR] Caused by: java.lang.NoClassDefFoundError: org/apache/maven/plugin/descriptor/MojoDescriptor
[ERROR] Caused by: org/apache/maven/plugin/descriptor/MojoDescriptor
[ERROR] Caused by: org.apache.maven.plugin.descriptor.MojoDescriptor

Source Code:

private void container( CliRequest cliRequest )
throws Exception
{
if ( cliRequest.classWorld == null )

DefaultPlexusContainer container = this.container;

if ( container == null )
{
ContainerConfiguration cc = new DefaultContainerConfiguration()
.setClassWorld( cliRequest.classWorld )
.setName( "maven" );

container = new DefaultPlexusContainer( cc ); //<<<<<<<<<<<<<<<<<<<<<< EXCEPTION THROWN

container.setLoggerManager( new MavenLoggerManager( logger ) );

container.getLoggerManager().setThresholds( cliRequest.request.getLoggingLevel() );

customizeContainer( container );

if ( cliRequest.classWorld == classWorld )

}

maven = container.lookup( Maven.class );

executionRequestPopulator = container.lookup( MavenExecutionRequestPopulator.class );

modelProcessor = createModelProcessor( container );

settingsBuilder = container.lookup( SettingsBuilder.class );

dispatcher = (DefaultSecDispatcher) container.lookup( SecDispatcher.class, "maven" );
}

thank you
K. Golbang