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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.io.*, java.net.*, java.util.*" %>
<%
  int currentJvm = Runtime.getRuntime().hashCode();
  int previousJvm = 0;
  if (session.getAttribute("previous_jvm") != null) {
    previousJvm = (Integer) session.getAttribute("previous_jvm");
  }
  // Make sure sessions-enabled=true in WEB-INF/appengine-web.xml
  session.setAttribute("previous_jvm", currentJvm);
 %>
<html>
  <head>
    <title>JVM: <%= currentJvm %></title>
  </head>
  <body style="font-family: courier;">
    This request was handled by JVM #<%= currentJvm %>.<p />

<% if (previousJvm != 0) {  %>
    Your previous request was handled by JVM #<%= previousJvm %>.<p />
<% } %>

<% if (previousJvm != 0 && currentJvm != previousJvm) { %>
    <b style="color: red;">Current JVM != Previous JVM</b><p />
<% } %>

  </body>
</html>