public  void destroy() 
{
        if (log.isDebugEnabled()) {
            log.debug("JspServlet.destroy()");
        }
        rctxt.destroy();
}

 public int getJspCount() 
{
        return this.rctxt.getJspCount();
}

Returns the number of JSPs for which JspServletWrappers exist, i.e., the number of JSPs that have been loaded into the webapp with which this JspServlet is associated.

This info may be used for monitoring purposes.

 public int getJspReloadCount() 
{
        return this.rctxt.getJspReloadCount();
}

Gets the number of JSPs that have been reloaded.

This info may be used for monitoring purposes.

 public  void init(ServletConfig config) throws ServletException 
{
    /*
     * Initializes this JspServlet.
     */
        super.init(config);
        this.config = config;
        this.context = config.getServletContext();
        // Initialize the JSP Runtime Context
        // Check for a custom Options implementation
        String engineOptionsName = 
            config.getInitParameter("engineOptionsClass");
        if (engineOptionsName != null) {
            // Instantiate the indicated Options implementation
            try {
                ClassLoader loader = Thread.currentThread()
                        .getContextClassLoader();
                Class engineOptionsClass = loader.loadClass(engineOptionsName);
                Class[] ctorSig = { ServletConfig.class, ServletContext.class };
                Constructor ctor = engineOptionsClass.getConstructor(ctorSig);
                Object[] args = { config, context };
                options = (Options) ctor.newInstance(args);
            } catch (Throwable e) {
                // Need to localize this.
                log.warn("Failed to load engineOptionsClass", e);
                // Use the default Options implementation
                options = new EmbeddedServletOptions(config, context);
            }
        } else {
            // Use the default Options implementation
            options = new EmbeddedServletOptions(config, context);
        }
        rctxt = new JspRuntimeContext(context, options);
        if (log.isDebugEnabled()) {
            log.debug(Localizer.getMessage("jsp.message.scratch.dir.is",
                    options.getScratchDir().toString()));
            log.debug(Localizer.getMessage("jsp.message.dont.modify.servlets"));
        }
}

 public  void periodicEvent() 
{
        rctxt.checkCompile();
}

 boolean preCompile(HttpServletRequest request) throws ServletException 
{
        String queryString = request.getQueryString();
        if (queryString == null) {
            return (false);
        }
        int start = queryString.indexOf(Constants.PRECOMPILE);
        if (start <  0) {
            return (false);
        }
        queryString =
            queryString.substring(start + Constants.PRECOMPILE.length());
        if (queryString.length() == 0) {
            return (true);             // ?jsp_precompile
        }
        if (queryString.startsWith("&")) {
            return (true);             // ?jsp_precompile&foo=bar...
        }
        if (!queryString.startsWith("=")) {
            return (false);            // part of some other name or value
        }
        int limit = queryString.length();
        int ampersand = queryString.indexOf("&");
        if (ampersand  > 0) {
            limit = ampersand;
        }
        String value = queryString.substring(1, limit);
        if (value.equals("true")) {
            return (true);             // ?jsp_precompile=true
        } else if (value.equals("false")) {
	    // Spec says if jsp_precompile=false, the request should not
	    // be delivered to the JSP page; the easiest way to implement
	    // this is to set the flag to true, and precompile the page anyway.
	    // This still conforms to the spec, since it says the
	    // precompilation request can be ignored.
            return (true);             // ?jsp_precompile=false
        } else {
            throw new ServletException("Cannot have request parameter " +
                                       Constants.PRECOMPILE + " set to " +
                                       value);
        }
}

Look for a precompilation request as described in Section 8.4.2 of the JSP 1.2 Specification. WARNING - we cannot use request.getParameter() for this, because that will trigger parsing all of the request parameters, and not give a servlet the opportunity to call request.setCharacterEncoding() first.

 public  void service(HttpServletRequest request,
    HttpServletResponse response) throws IOException, ServletException 
{
        String jspUri = null;
        String jspFile = (String) request.getAttribute(Constants.JSP_FILE);
        if (jspFile != null) {
            // JSP is specified via < jsp-file > in < servlet > declaration
            jspUri = jspFile;
        } else {
            /*
             * Check to see if the requested JSP has been the target of a
             * RequestDispatcher.include()
             */
            jspUri = (String) request.getAttribute(Constants.INC_SERVLET_PATH);
            if (jspUri != null) {
                /*
		 * Requested JSP has been target of
                 * RequestDispatcher.include(). Its path is assembled from the
                 * relevant javax.servlet.include.* request attributes
                 */
                String pathInfo = (String) request.getAttribute(
                                    "javax.servlet.include.path_info");
                if (pathInfo != null) {
                    jspUri += pathInfo;
                }
            } else {
                /*
                 * Requested JSP has not been the target of a 
                 * RequestDispatcher.include(). Reconstruct its path from the
                 * request's getServletPath() and getPathInfo()
                 */
                jspUri = request.getServletPath();
                String pathInfo = request.getPathInfo();
                if (pathInfo != null) {
                    jspUri += pathInfo;
                }
            }
        }
        if (log.isDebugEnabled()) {	    
            log.debug("JspEngine -- > " + jspUri);
            log.debug("\t     ServletPath: " + request.getServletPath());
            log.debug("\t        PathInfo: " + request.getPathInfo());
            log.debug("\t        RealPath: " + context.getRealPath(jspUri));
            log.debug("\t      RequestURI: " + request.getRequestURI());
            log.debug("\t     QueryString: " + request.getQueryString());
            log.debug("\t  Request Params: ");
            Enumeration e = request.getParameterNames();
            while (e.hasMoreElements()) {
                String name = (String) e.nextElement();
                log.debug("\t\t " + name + " = " 
                          + request.getParameter(name));
            }
        }
        try {
            boolean precompile = preCompile(request);
            serviceJspFile(request, response, jspUri, null, precompile);
        } catch (RuntimeException e) {
            throw e;
        } catch (ServletException e) {
            throw e;
        } catch (IOException e) {
            throw e;
        } catch (Throwable e) {
            throw new ServletException(e);
        }
}

 public  void setJspReloadCount(int count) 
{
        this.rctxt.setJspReloadCount(count);
}

Resets the JSP reload counter.