ServletContext.getResource() and FileNotFound

Wednesday, 12 November 2014

Hi everybody,
I'm trying to migrate my webapp from Jetty to Undertow.

The stack is composed by Undertow Guice and Struts2.

I developed the following class to configure undertow:

package com.billdrawer.website.server;
...

 import io.undertow.Undertow;
 import io.undertow.predicate.Predicates;
 import io.undertow.server.HandlerWrapper;
 import io.undertow.server.HttpHandler;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.server.handlers.PathHandler;
 import io.undertow.server.handlers.PredicateHandler;
 import io.undertow.server.handlers.resource.ResourceHandler;
 import io.undertow.servlet.api.ConfidentialPortManager;
 import io.undertow.servlet.api.Deployment;
 import io.undertow.servlet.api.DeploymentInfo;
 import io.undertow.servlet.api.DeploymentManager;
 import io.undertow.servlet.api.FilterInfo;
 import io.undertow.servlet.api.ListenerInfo;
 import io.undertow.servlet.api.LoginConfig;
 import io.undertow.servlet.api.SecurityConstraint;
 import io.undertow.servlet.api.ServletContainer;
 import io.undertow.servlet.api.WebResourceCollection;

 import java.net.URL;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.EnumSet;

 import javax.inject.Inject;
 import javax.inject.Named;
 import javax.servlet.DispatcherType;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;

 import org.apache.log4j.Logger;
 import org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter;
 import org.keycloak.adapters.AdapterConstants;
 import org.keycloak.adapters.undertow.KeycloakServletExtension;

 import com.billdrawer.website.common.Config;
 import com.billdrawer.website.listener.WebsiteServletContextListener;
 import com.google.inject.servlet.GuiceFilter;

 public class UndertowServer implements Server {
     private Logger _logger = Logger.getLogger(UndertowServer.class);
     private Undertow _server;
     private DeploymentManager _manager;
     private int _port;
     private String _host;

     @Inject
     public UndertowServer((a)Named(Config.STAGE) String stage, @Named(Config.SERVER_HOST)
String host, @Named(Config.SERVER_PORT) int port,
             @Named(Config.SERVER_TIMEOUT) int timeout) {
         _port = port;
         _host = host;

         DeploymentInfo deploymentInfo = getDeploymentInfo(stage);

         ServletContainer _container = ServletContainer.Factory.newInstance();
         _manager = _container.addDeployment(deploymentInfo);
         _manager.deploy();

         Deployment deployment = _manager.getDeployment();

         KeycloakServletExtension keycloak = new KeycloakServletExtension();
         deploymentInfo.addServletExtension(keycloak);
         deploymentInfo.addInitParameter(AdapterConstants.AUTH_DATA_PARAM_NAME,
getKeyloakJson());
         keycloak.handleDeployment(deploymentInfo,
_manager.getDeployment().getServletContext());

         final ServletContext servletContext = deployment.getServletContext();
         _logger.debug("Context initialized:"+servletContext.getContextPath());
     }

     protected String getKeyloakJson() {
         String keycloak = "";
         URL url = getClassLoader().getResource("keycloak.json");
         if (url != null) {
             try {
                 byte[] encoded = Files.readAllBytes(Paths.get(url.toURI()));
                 keycloak = new String(encoded, "utf-8");
             } catch (Exception e) {
                 _logger.error("Can't read keycloak.json", e);
             }
         }
         return keycloak;
     }

     protected DeploymentInfo getDeploymentInfo(String stage) {
         final DeploymentInfo deploymentInfo = new DeploymentInfo();
         deploymentInfo.setClassLoader(getClassLoader());
         deploymentInfo.setContextPath("/");
         deploymentInfo.setDefaultEncoding("UTF-8");
         deploymentInfo.setDeploymentName("website.war");
         deploymentInfo.setDisplayName("WebsiteServer");
         deploymentInfo.setUrlEncoding("UTF-8");

         deploymentInfo.addListener(new
ListenerInfo(WebsiteServletContextListener.class));

         FilterInfo guiceFilter = new FilterInfo("GuiceFilter",
GuiceFilter.class);
         deploymentInfo.addFilter(guiceFilter);
         for (DispatcherType dispatcher : EnumSet.allOf(DispatcherType.class)) {
             deploymentInfo.addFilterUrlMapping(guiceFilter.getName(), "/*",
dispatcher);
         }

         FilterInfo strutsPrepareAndExecuteFilter = new
FilterInfo("StrutsFilter", StrutsPrepareAndExecuteFilter.class);
         deploymentInfo.addFilter(strutsPrepareAndExecuteFilter);
         for (DispatcherType dispatcher : EnumSet.allOf(DispatcherType.class)) {
             deploymentInfo.addFilterUrlMapping(strutsPrepareAndExecuteFilter.getName(),
"/*", dispatcher);
         }

         deploymentInfo.addInitialHandlerChainWrapper(new HandlerWrapper() {
             @Override
             public HttpHandler wrap(final HttpHandler handler) {
                 final ResourceHandler resourceHandler = new
ResourceHandler(deploymentInfo.getResourceManager());
                 PredicateHandler predicateHandler = new
PredicateHandler(Predicates.suffixes(".css",".html",".js"),resourceHandler,
handler);
                 return predicateHandler;
             }
         });

         configureSecurity(deploymentInfo);

         return deploymentInfo;
     }

     protected void configureSecurity(DeploymentInfo deploymentInfo) {
         deploymentInfo.setLoginConfig(new LoginConfig("KEYCLOAK",
"billdrawer"));
         deploymentInfo.setConfidentialPortManager(new ConfidentialPortManager() {
             @Override
             public int getConfidentialPort(HttpServerExchange exchange) {
                 return _port;
             }
         });
         SecurityConstraint securityConstraint = new SecurityConstraint();
         WebResourceCollection webResourceCollection = new WebResourceCollection();
         webResourceCollection.addUrlPattern("/dashboard/*");
         securityConstraint.addWebResourceCollection(webResourceCollection);
         securityConstraint.addRoleAllowed("user");
         deploymentInfo.addSecurityConstraint(securityConstraint);
     }

     protected ClassLoader getClassLoader() {
         return getClass().getClassLoader();
     }

     public void start() {
         _logger.debug("starting...");
         try {
             Undertow.Builder builder = Undertow.builder();
             builder.addHttpListener(_port, _host);

             final PathHandler rootHandler = new PathHandler();

rootHandler.addPrefixPath(_manager.getDeployment().getDeploymentInfo().getContextPath(),
_manager.start());

             builder.setHandler(rootHandler);
             _server = builder.build();
             _server.start();
         } catch (ServletException e) {
             _logger.error("Unexpected exception", e);
         }
         _logger.info("###START###");
     }

     public void stop() {
         _logger.debug("stopping...");
         try {
             _manager.stop();
             _server.stop();
         } catch (ServletException e) {
             _logger.error("Unexpected exception", e);
         }
         _logger.info("###STOP###");
     }
 }

 Everything is working until I do not try to load resources from context. I need
some help before rollback to Jetty :(

--
Davide

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