protected  void addToCache(String templateName,
    Template template) 
{
        templates.put(templateName, template);
}

 protected  void addToMissingTemplateCache(String templateName) 
{
        missingTemplates.add(templateName);
}

 public  void clearTemplatesCache() 
{
        templates.clear();
        missingTemplates.clear();
}

Clear the templates and missing templates cache

 protected Template findInCache(String templateName) 
{
        return templates.get(templateName);
}

 protected String getSuffix() 
{
        return "ftl";
}

 protected boolean isTemplateMissing(String templateName) 
{
        return missingTemplates.contains(templateName);
}

 public  void renderTemplate(TemplateRenderingContext templateContext) throws Exception 
{
    	// get the various items required from the stack
        ValueStack stack = templateContext.getStack();
        Map context = stack.getContext();
        ServletContext servletContext = (ServletContext) context.get(ServletActionContext.SERVLET_CONTEXT);
        HttpServletRequest req = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
        HttpServletResponse res = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);
        // prepare freemarker
        Configuration config = freemarkerManager.getConfiguration(servletContext);
        // get the list of templates we can use
        List< Template > templates = templateContext.getTemplate().getPossibleTemplates(this);
        // find the right template
        freemarker.template.Template template = null;
        String templateName = null;
        Exception exception = null;
        for (Template t : templates) {
            templateName = getFinalTemplateName(t);
            if (freemarkerCaching) {
                if (!isTemplateMissing(templateName)) {
                    try {
                        template = findInCache(templateName);  // look in cache first
                        if (template == null) {
                            // try to load, and if it works, stop at the first one
                            template = config.getTemplate(templateName);
                            addToCache(templateName, template);
                        }
                        break;
                    } catch (IOException e) {
                        addToMissingTemplateCache(templateName);
                        if (exception == null) {
                            exception = e;
                        }
                    }
                }
            } else {
                try {
                    // try to load, and if it works, stop at the first one
                    template = config.getTemplate(templateName);
                    break;
                } catch (ParseException e) {
                    // template was found but was invalid - always report this.
                    exception = e;
                    break;
                } catch (IOException e) {
                    // FileNotFoundException is anticipated - report the first IOException if no template found
                    if (exception == null) {
                        exception = e;
                    }
                }
            }
        }
        if (template == null) {
            if (LOG.isErrorEnabled()) {
                LOG.error("Could not load the FreeMarker template named '" + templateContext.getTemplate().getName() +"':");
                for (Template t : templates) {
                    LOG.error("Attempted: " + getFinalTemplateName(t));
                }
                LOG.error("The TemplateLoader provided by the FreeMarker Configuration was a: "+config.getTemplateLoader().getClass().getName());
            }
            if (exception != null) {
                throw exception;
            } else {
                return;
            }
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("Rendering template " + templateName);
        }
        ActionInvocation ai = ActionContext.getContext().getActionInvocation();
        Object action = (ai == null) ? null : ai.getAction();
        SimpleHash model = freemarkerManager.buildTemplateModel(stack, action, servletContext, req, res, config.getObjectWrapper());
        model.put("tag", templateContext.getTag());
        model.put("themeProperties", getThemeProps(templateContext.getTemplate()));
        // the BodyContent JSP writer doesn't like it when FM flushes automatically --
        // so let's just not do it (it will be flushed eventually anyway)
        Writer writer = templateContext.getWriter();
        final Writer wrapped = writer;
        writer = new Writer() {
            public void write(char cbuf[], int off, int len) throws IOException {
                wrapped.write(cbuf, off, len);
            }
            public void flush() throws IOException {
                // nothing!
            }
            public void close() throws IOException {
                wrapped.close();
            }
        };
        try {
            stack.push(templateContext.getTag());
            template.process(model, writer);
        } finally {
            stack.pop();
        }
}

 public  void setCacheTemplates(String cacheTemplates) 
{
        freemarkerCaching = "true".equals(cacheTemplates);
}

Enables or disables Struts caching of Freemarker templates. By default disabled. Set struts.freemarker.templatesCache=true to enable cache

 public  void setFreemarkerManager(FreemarkerManager mgr) 
{
        this.freemarkerManager = mgr;
}