Upgrading my Java env actually helped. This works:

Apache Maven 3.0.4 (r1232337; 2012-01-17 09:44:56+0100)
Maven home: /opt/java/maven
Java version: 1.7.0_10-ea, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_10.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.7.5", arch: "x86_64", family: "mac"

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