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• you have created your GPG keys. For more information, please refer to Making GPG Keys.
• you have a GPG client installed and on your shell's path. See http://www.gnupg.org/.
• you have a Subversion 1.5+ client installed and on your shell's path. See http://subversion.tigris.org/.
• you have a Java 1.4.2 JDK installed and on your shell's path. See http://java.sun.com/j2se/1.4.2/download.html.
• you have set the environment variable MAVEN_OPTS=-Xmx512m
• you are using Maven 2.0.x or 2.2.1+, as Maven 2.1.x is known to produce wrong gpg pom signatures (see MGPG-14).

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Make sure maven uses Java 5

Create a mvn5 shell script and add it to your PATH. This script makes sure you use Java 5 to build the release.

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