[undertow-dev] ServletContext.getResource() and FileNotFound

[Davide Ungari]

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(@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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