Comment 0 for bug 417164

after a recent update, Maven no longer works. running it produces this error:

$ mvn
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/plexus/component/repository/exception/ComponentLifecycleException
 at java.lang.Class.getDeclaredMethods0(Native Method)
 at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
 at java.lang.Class.privateGetPublicMethods(Class.java:2547)
 at java.lang.Class.getMethods(Class.java:1410)
 at org.codehaus.classworlds.Launcher.getEnhancedMainMethod(Launcher.java:195)
 at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:294)
 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: java.lang.ClassNotFoundException: org.codehaus.plexus.component.repository.exception.ComponentLifecycleException
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
 at org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195)
 at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255)
 at org.codehaus.classworlds.RealmClassLoader.loadClass(RealmClassLoader.java:214)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 ... 9 more

this may have to do wish issue 412839 or issue 414561. completing issue 416312 (upgrade maven to 2.2.1) might be an easy way to fix this...