Maven从2.0.8切换到2.0.9后，出现如下错误：

E:\>mvn -e archetype:generate
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'archetype'.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Required goal not found: archetype:generate in org.apache.maven.plugins:m
aven-archetype-plugin:1.0-alpha-7
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.BuildFailureException: Required goal not found: archetype:gener
ate in org.apache.maven.plugins:maven-archetype-plugin:1.0-alpha-7
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor
(DefaultLifecycleExecutor.java:1558)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.segmentTaskListBy
AggregationNeeds(DefaultLifecycleExecutor.java:405)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
fecycleExecutor.java:137)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.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)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Wed Jun 11 15:17:11 CST 2008
[INFO] Final Memory: 1M/3M
[INFO] ------------------------------------------------------------------------



把repository里面的org/apache/maven里面的东西删掉之后，重新来，OK了。