public int doEndTag() 
{
        return EVAL_PAGE;
}

 public int doStartTag() 
{
        server = getMBeanServer();
        return EVAL_BODY_INCLUDE;
}

 public MBeanServer getMBeanServer() 
{
        Iterator servers = MBeanServerFactory.findMBeanServer(null).iterator();
        MBeanServer server = null;
        while (servers.hasNext()) {
            server = (MBeanServer) servers.next();
        }
        return server;
}

 public Set getMBeans() 
{
        try {
            if (server != null) {
                ObjectName objectName = new ObjectName(getObjectNameFilter());
                QueryExp query = null;
                return server.queryMBeans(objectName, query);
            } else {
                throw new Exception("MBean server has not been initialized");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
}

 public String getObjectNameFilter() 
{
        String filter =
                pageContext.getRequest().getParameter("ObjectNameFilter");
        if (filter == null || filter == "") {
            return "*:*";
        }
        return filter;
}