Upon running mvn install glassfish:deploy I run into the following problems
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[ERROR] Failed to execute goal org.glassfish.maven.plugin:maven-glassfish-plugin:2.1:deploy (default-cli) on project post-build-pom: Execution default-cli of goal org.glassfish.maven.plugin:maven-glassfish-plugin:2.1:deploy failed: Plugin o    rg.glassfish.maven.plugin:maven-glassfish-plugin:2.1 or one of its dependencies could not be resolved: Failed to collect dependencies for org.glassfish.maven.plugin:maven-glassfish-plugin:jar:2.1 (): Failed to read artifact descriptor for org.apache.maven:maven-plugin-api:jar:3.0-SONATYPE-688946: Failure to find org.apache.maven:maven-parent:pom:9-SNAPSHOT in http://maven-repository/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of internal-repository has elapsed or updates are forced -> [Help 1]
[...]
My mvn -v looks like this:
Apache Maven 3.0.4 (r1232337; 2012-01-17 09:44:56+0100)
Maven home: C:\Users\rob\apache-maven-3.0.4\bin\..
Java version: 1.6.0_37, vendor: Sun Microsystems Inc.
Java home: C:\Programme\Java\jdk1.6.0_37\jre
Default locale: de_DE, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"
Futhermore my nexus-repository runs on http://maven-repository .
EDIT: The plugin-part from pom.xml looks like this:
<plugin>
    <groupId>org.glassfish.maven.plugin</groupId>
    <artifactId>maven-glassfish-plugin</artifactId>
    <version>2.1</version>
    <configuration>
        <user>admin</user>
        <adminPassword>adminadmin</adminPassword>
        <glassfishDirectory>c:\development\glassfish-v2.1.1-b31g</glassfishDirectory>
    </configuration>
</plugin>