Examples of javax.servlet.Servlet

javax.servlet.Servlet
Basic servlet interface @author Rick Knowles

        ClassLoader old = Thread.currentThread().getContextClassLoader();
        ClassLoader webappClassLoader =
                ((Context) getParent()).getLoader().getClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(webappClassLoader);
            Servlet s = allocate();
            deallocate(s);
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
        } finally {
            Thread.currentThread().setContextClassLoader(old);

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        PrintStream out = System.out;
        if (swallowOutput) {
            SystemLogHandler.startCapture();
        }


        Servlet servlet;
        try {
            long t1=System.currentTimeMillis();
            // Complain if no servlet class has been specified
            if (servletClass == null) {
                unavailable(null);
                throw new ServletException
                    (sm.getString("standardWrapper.notClass", getName()));
            }


            InstanceManager instanceManager = ((StandardContext)getParent()).getInstanceManager();
            try {
                servlet = (Servlet) instanceManager.newInstance(servletClass);
            } catch (ClassCastException e) {
                unavailable(null);
                // Restore the context ClassLoader
                throw new ServletException
                    (sm.getString("standardWrapper.notServlet", servletClass), e);
            } catch (Throwable e) {
                e = ExceptionUtils.unwrapInvocationTargetException(e);
                ExceptionUtils.handleThrowable(e);
                unavailable(null);


                // Added extra log statement for Bugzilla 36630:
                // http://issues.apache.org/bugzilla/show_bug.cgi?id=36630
                if(log.isDebugEnabled()) {
                    log.debug(sm.getString("standardWrapper.instantiate", servletClass), e);
                }


                // Restore the context ClassLoader
                throw new ServletException
                    (sm.getString("standardWrapper.instantiate", servletClass), e);
            }


            if (multipartConfigElement == null) {
                MultipartConfig annotation =
                        servlet.getClass().getAnnotation(MultipartConfig.class);
                if (annotation != null) {
                    multipartConfigElement =
                            new MultipartConfigElement(annotation);
                }
            }


            processServletSecurityAnnotation(servlet.getClass());


            // Special handling for ContainerServlet instances
            if ((servlet instanceof ContainerServlet) &&
                    (isContainerProvidedServlet(servletClass) ||
                            ((Context) getParent()).getPrivileged() )) {

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        }


        if (singleThreadModel && (instancePool != null)) {
            try {
                while (!instancePool.isEmpty()) {
                    Servlet s = instancePool.pop();
                    if (Globals.IS_SECURITY_ENABLED) {
                        try {
                            SecurityUtil.doAsPrivilege("destroy", s);
                        } finally {
                            SecurityUtil.remove(s);
                        }
                    } else {
                        s.destroy();
                    }
                    // Annotation processing
                    if (!((Context) getParent()).getIgnoreAnnotations()) {
                       ((StandardContext)getParent()).getInstanceManager().destroyInstance(s);
                    }

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    }


    @SuppressWarnings("unchecked")
    private Servlet loadServlet()
    throws ServletException, IOException {
        Servlet servlet = null;


        try {
            if ( log.isDebugEnabled() ) {
                log.debug("Loading servlet " + jspUri);
            }
            servlet = (Servlet) ctxt.load().newInstance();
            AnnotationProcessor annotationProcessor = (AnnotationProcessor) config.getServletContext().getAttribute(AnnotationProcessor.class.getName());
            if (annotationProcessor != null) {
               annotationProcessor.processAnnotations(servlet);
               annotationProcessor.postConstruct(servlet);
            }
            // update dependents
            final List<String> oldDeps = this.dependents;
            if (servlet != null && servlet instanceof JspSourceDependent) {
                this.dependents = (List<String>) ((JspSourceDependent) servlet).getDependants();
                if ( this.dependents == null ) {
                    this.dependents = Collections.EMPTY_LIST;
                }
                this.ctxt.getRuntimeContext().addJspDependencies(this, this.dependents);
            }
            if ( !equals(oldDeps, this.dependents) ) {
                this.persistDependencies();
            }
        } catch (final IllegalAccessException e) {
            throw new JasperException(e);
        } catch (final InstantiationException e) {
            throw new JasperException(e);
        } catch (final Exception e) {
            throw new JasperException(e);
        }


        servlet.init(config);


        return servlet;
    }

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        if (includeLoginForm && (resourceResolverFactory != null)) {
            ResourceResolver resourceResolver = null;
            try {
                resourceResolver = resourceResolverFactory.getAdministrativeResourceResolver(null);
                Resource loginFormResource = resourceResolver.resolve(loginForm);
                Servlet loginFormServlet = loginFormResource.adaptTo(Servlet.class);
                if (loginFormServlet != null) {
                    try {
                        loginFormServlet.service(request, response);
                        return true;
                    } catch (ServletException e) {
                        log.error("Failed to include the form: " + loginForm, e);
                    }
                }

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     */
    @SuppressWarnings("unchecked")
    @Override
    public <AdapterType> AdapterType adaptTo(final Class<AdapterType> type) {
        if ( type == Servlet.class ) {
            final Servlet s = (Servlet)super.adaptTo(type);
            if ( s != null ) {
                return (AdapterType)s;
            }
        }
        return this.getActiveResource().adaptTo(type);

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        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("resolveServlet called for resource {}", resource);
        }


        final ResourceResolver scriptResolver = this.getScriptResourceResolver();
        Servlet servlet = null;


        if ( type != null && type.length() > 0 ) {
            servlet = resolveServletInternal(request, null, type, scriptResolver);
        }

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        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("resolveServlet called for resource {} with script name {}", resource, scriptName);
        }


        final ResourceResolver scriptResolver = this.getScriptResourceResolver();
        final Servlet servlet = resolveServletInternal(null, resource, scriptName, scriptResolver);


        // log the servlet found
        if (LOGGER.isDebugEnabled()) {
            if (servlet != null) {
                LOGGER.debug("Servlet {} found for resource {} and script name {}", new Object[] {RequestUtil.getServletName(servlet), resource, scriptName});

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        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("resolveServlet called for for script name {}", scriptName);
        }


        final ResourceResolver scriptResolver = this.getScriptResourceResolver();
        final Servlet servlet = resolveServletInternal(null, (Resource)null, scriptName, scriptResolver);


        // log the servlet found
        if (LOGGER.isDebugEnabled()) {
            if (servlet != null) {
                LOGGER.debug("Servlet {} found for script name {}", RequestUtil.getServletName(servlet), scriptName);

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            // find a servlet for the status as the method name
            ResourceCollector locationUtil = new ResourceCollector(String.valueOf(status),
                    ServletResolverConstants.ERROR_HANDLER_PATH, resource,
                    this.executionPaths);
            Servlet servlet = getServletInternal(locationUtil, request, scriptResolver);


            // fall back to default servlet if none
            if (servlet == null) {
                servlet = getDefaultErrorServlet(request, resource, scriptResolver);
            }

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