I am using this Maven plugin which replaces the // Generated on: 2011.02.23 at 02:17:06 PM GMT line:
<plugin>
<groupId>com.google.code.maven-replacer-plugin</groupId>
<artifactId>maven-replacer-plugin</artifactId>
<version>1.3.8</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>replace</goal>
</goals>
</execution>
</executions>
<configuration>
<includes>
<include>src/main/java/jaxb/*.java</include>
</includes>
<token>^// Generated on.*$</token>
<value>// Generated on: [TEXT REMOVED by maven-replacer-plugin]</value>
<regexFlags>
<regexFlag>MULTILINE</regexFlag>
</regexFlags>
</configuration>
</plugin>