appengine-web.xml

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <application>{YOUR APPLICATION NAME}</application>
    <version>{YOUR VERSION NUMBER}</version>
    <static-files>
      <include path="/public/**.*" />
    </static-files>
    <resource-files />
    <sessions-enabled>false</sessions-enabled>
    <system-properties>
      <property name="jruby.management.enabled" value="false" />
      <property name="os.arch" value="" />
      <property name="jruby.compile.mode" value="JIT"/> <!-- JIT|FORCE|OFF -->
      <property name="jruby.compile.fastest" value="true"/>
      <property name="jruby.compile.frameless" value="true"/>
      <property name="jruby.compile.positionless" value="true"/>
      <property name="jruby.compile.threadless" value="false"/>
      <property name="jruby.compile.fastops" value="false"/>
      <property name="jruby.compile.fastcase" value="false"/>
      <property name="jruby.compile.chainsize" value="500"/>
      <property name="jruby.compile.lazyHandles" value="false"/>
      <property name="jruby.compile.peephole" value="true"/>
   </system-properties>
</appengine-web-app>