Unable to release XE with maven 2.1.0-M1 and maven-release-plugin 2.0-beta-8

~/xwiki-trunks/enterprise$ mvn release:prepare -Pci,hsqldb,mysql,pgsql,derby,jetty -Darguments="-Pjetty,hsqldb" -DautoVersionSubmodules=true -DreleaseVersion=1.7-milestone-2 -DdevelopmentVersion=1.7-SNAPSHOT
[... SNIP ...]
[INFO] Scanning for projects...
[INFO] Reactor build order: 
[INFO]   XWiki Products - Enterprise - Parent POM
[INFO]   XWiki Products - Enterprise - Wiki
[INFO]   XWiki Products - Enterprise - Database - Parent POM
[INFO]   XWiki Products - Enterprise - Database - HSQLDB
[INFO]   XWiki Products - Enterprise - Database - Derby
[INFO]   XWiki Products - Enterprise - Database - PGSQL
[INFO]   XWiki Products - Enterprise - Database - MySQL
[INFO]   XWiki Products - Enterprise - Web
[INFO]   XWiki Products - Enterprise - Distribution - Parent POM
[INFO]   XWiki Products - Enterprise - Distribution - Jetty
[INFO]   XWiki Products - Enterprise - Distribution - HSQLDB
[INFO]   XWiki Products - Enterprise - Distribution - Derby
[INFO]   XWiki Products - Enterprise - Distribution - PGSQL
[INFO]   XWiki Products - Enterprise - Distribution - MySQL
[INFO]   XWiki Products - Enterprise - Installers - Generic
[INFO]   XWiki Products - Enterprise - Installers - Windows
[INFO]   XWiki Products - Enterprise - Installers - Parent POM
[INFO]   XWiki Products - Enterprise - Functional Tests
[INFO]   XWiki Products - Enterprise - Misc. Functional Tests
[INFO]   XWiki Products - Enterprise - Functional XMLRPC Tests
[INFO]   XWiki Products - Enterprise - Functional Selenium Tests
[INFO]   XWiki Products - Enterprise - LDAP Functional Tests
[INFO] Searching repository for plugin with prefix: 'release'.
[INFO] ------------------------------------------------------------------------
[INFO] Building XWiki Products - Enterprise - Parent POM
[INFO]    task-segment: [release:prepare] (aggregator-style)
[INFO] ------------------------------------------------------------------------
Downloading: http://maven.xwiki.org/externals/opensymphony/quartz/1.6.0/quartz-1.6.0.pom
Downloading: http://maven.xwiki.org/releases/opensymphony/quartz/1.6.0/quartz-1.6.0.pom
Downloading: http://repo1.maven.org/maven2/opensymphony/quartz/1.6.0/quartz-1.6.0.pom
Downloading: http://maven.xwiki.org/externals/groovy/groovy-all-1.0-jsr/06/groovy-all-1.0-jsr-06.pom
Downloading: http://maven.xwiki.org/releases/groovy/groovy-all-1.0-jsr/06/groovy-all-1.0-jsr-06.pom
Downloading: http://repo1.maven.org/maven2/groovy/groovy-all-1.0-jsr/06/groovy-all-1.0-jsr-06.pom
[INFO] [release:prepare]
[INFO] Resuming release from phase 'run-preparation-goals'
[INFO] Executing goals 'clean install'...
[WARNING] Maven will be executed in interactive mode, but no input stream has been configured for this MavenInvoker instance.
[INFO] [INFO] Scanning for projects...
[INFO] [INFO] Reactor build order: 
[INFO] [INFO]   XWiki Products - Enterprise - Parent POM
[INFO] [INFO]   XWiki Products - Enterprise - Wiki
[INFO] [INFO]   XWiki Products - Enterprise - Database - Parent POM
[INFO] [INFO]   XWiki Products - Enterprise - Database - HSQLDB
[INFO] [INFO]   XWiki Products - Enterprise - Web
[INFO] [INFO]   XWiki Products - Enterprise - Distribution - Parent POM
[INFO] [INFO]   XWiki Products - Enterprise - Distribution - Jetty
[INFO] [INFO]   XWiki Products - Enterprise - Distribution - HSQLDB
[INFO] [INFO]   XWiki Products - Enterprise - Installers - Generic
[INFO] [INFO]   XWiki Products - Enterprise - Installers - Windows
[INFO] [INFO]   XWiki Products - Enterprise - Installers - Parent POM
[INFO] [INFO]   XWiki Products - Enterprise - Functional Tests
[INFO] [INFO]   XWiki Products - Enterprise - Misc. Functional Tests
[INFO] [INFO]   XWiki Products - Enterprise - Functional XMLRPC Tests
[INFO] [INFO]   XWiki Products - Enterprise - Functional Selenium Tests
[INFO] [INFO]   XWiki Products - Enterprise - LDAP Functional Tests

 
~/xwiki-trunks/enterprise$ mvn release:prepare -Pci,hsqldb,mysql,pgsql,derby,jetty -Darguments="-Pjetty,hsqldb" 
[... SNIP ...]
[INFO] [release:prepare]
[INFO] Resuming release from phase 'run-preparation-goals'
[INFO] Executing goals 'clean install'...
[INFO] Executing: mvn clean install --no-plugin-updates -Pjetty,hsqldb -P ci,jetty
[INFO] Scanning for projects...
        [INFO] Reactor build order: 
        [INFO]   XWiki Products - Enterprise - Parent POM
        [INFO]   XWiki Products - Enterprise - Wiki
        [INFO]   XWiki Products - Enterprise - Database - Parent POM
        [INFO]   XWiki Products - Enterprise - Database - HSQLDB
        [INFO]   XWiki Products - Enterprise - Web
        [INFO]   XWiki Products - Enterprise - Distribution - Parent POM
        [INFO]   XWiki Products - Enterprise - Distribution - Jetty
        [INFO]   XWiki Products - Enterprise - Distribution - HSQLDB
        [INFO] ------------------------------------------------------------------------