anchor.diff:  <%@ page import="javax.xml.namespace.QName" %>
   <%@ page import="java.util.Map" %>
   <%@ page import="java.util.TreeMap" %>
  +<%@ page import="java.net.URLEncoder" %>
  +<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
   
   <jsp:useBean id="instanceFilter" scope="session" class="org.wso2.carbon.bpel.ui.InstanceFilter"/>
   <jsp:setProperty name="instanceFilter" property="*" />
  +
   
   <%
       response.setHeader("Cache-Control",
  
positive.code:         instanceListFilter = InstanceFilterUtil.createInstanceFilterStringFromFormData(instanceFilter);
          instanceListOrderBy = InstanceFilterUtil.getOrderByFromFormData(instanceFilter);
  
          parameters = "filter=" + instanceListFilter + "&order=" + instanceListOrderBy;
  
          try {
              client = new InstanceManagementServiceClient(cookie, backendServerURL, configContext);
  
negative.code:     String pageNumber = CharacterEncoder.getSafeText(request.getParameter("pageNumber"));
      int pageNumberInt = 0;
      String instanceListFilter = CharacterEncoder.getSafeText(request.getParameter("filter"));
      String instanceListOrderBy = CharacterEncoder.getSafeText(request.getParameter("order"));
  
      String parameters = null;
      final String ENCODING_SCHEME = "UTF-8";
  
      String resetFilterLink = "list_instances.jsp?pageNumber=0&operation=reset";
      String activeInstancesFilterLink = "list_instances.jsp?pageNumber=0&filter=status%3Dactive&order=%2dlast-active";
  