如何在Google App Engine灵活环境中设置Jetty线程池

<?xml version="1.0" encoding="UTF-8"?>
<Configure id="jetty" class="org.eclipse.jetty.server.Server">
    <New id="threadPool" class="org.eclipse.jetty.util.thread.QueuedThreadPool">
        <Set name="minThreads">10</Set>
        <Set name="maxThreads">100</Set>
        <Set name="idleTimeout">60000</Set>
    </New>
    <Call name="addConnector">
        <Arg>
            <New class="org.eclipse.jetty.server.ServerConnector">
                <Arg name="server">
                    <Ref refid="jetty" />
                </Arg>
                <Set name="port">8080</Set>
            </New>
        </Arg>
    </Call>
</Configure>

env_variables:
  JETTY_CONFIG: jetty.xml

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.xml.XmlConfiguration;

// ...

Server server = new Server();
XmlConfiguration configuration = new XmlConfiguration(new FileInputStream(System.getenv("JETTY_CONFIG")));
configuration.configure(server);
server.start();