assembly exclude (not working)

gistfile1.txt

<assembly>
    <id>deps</id>
    <formats>
        <format>jar</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>
    <dependencySets>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <unpack>true</unpack>
            <scope>runtime</scope>
            <unpackOptions>
                <excludes>
                    <exclude>org.apache.cassandra:cassandra-all</exclude>
                    <!--<exclude>apache-cassandra*.jar</exclude>-->
                </excludes>
            </unpackOptions>
            <useStrictFiltering>true</useStrictFiltering>
            <useProjectArtifact>true</useProjectArtifact>
        </dependencySet>
    </dependencySets>
</assembly>