src/main/assembly/src-assembly.xml

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<assembly
  xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">

  <id>src</id>

  <baseDirectory>${project.build.finalName}-src</baseDirectory>

  <formats>
    <format>tar.gz</format>
  </formats>

  <componentDescriptors>
    <componentDescriptor>src/main/assembly/component.xml</componentDescriptor>
  </componentDescriptors>

  <files>
    <file>
      <source>NOTICE.txt</source>
      <outputDirectory>/</outputDirectory>
    </file>
  </files>

</assembly>