Replace web.xml with GreenhouseWebAppInitializer

Pom has been upgraded to servlet-api 3.0, and web.xml has been
eliminated completely in favor of Spring 3.1's new
WebApplicationInitializer SPI, which builds upon Servlet 3.0's
ServletContainerInitializers.

See WebApplicationInitializer Javadoc for complete details.

Author: cbeams

pom.xml

@@ -254,9 +254,9 @@
 
 		<!-- Servlet -->
 		<dependency>
-			<groupId>javax.servlet</groupId>
+			<groupId>org.mortbay.jetty</groupId>
 			<artifactId>servlet-api</artifactId>
-			<version>2.5</version>
+			<version>3.0.20100224</version>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
@@ -521,6 +521,9 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-war-plugin</artifactId>
 				<version>2.1.1</version>
+				<configuration>
+					<failOnMissingWebXml>false</failOnMissingWebXml>
+				</configuration>
 			</plugin>			
 			<!-- Tomcat 7 Plugin -->
 			<plugin>
@@ -631,4 +634,4 @@
 		</snapshotRepository>
 	</distributionManagement>
 
-</project>
+</project>

src/main/java/com/springsource/greenhouse/config/GreenhouseWebAppInitializer.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2002-2011 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.springsource.greenhouse.config;
+
+import java.util.Set;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRegistration;
+
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.context.support.GenericWebApplicationContext;
+import org.springframework.web.filter.DelegatingFilterProxy;
+import org.springframework.web.filter.HiddenHttpMethodFilter;
+import org.springframework.web.flash.FlashMapFilter;
+import org.springframework.web.servlet.DispatcherServlet;
+
+/**
+ * Code-based alternative to web.xml for use within Servlet 3.0+ environments. See
+ * {@link WebApplicationInitializer} Javadoc for complete details.
+ *
+ * @author Chris Beams
+ */
+public class GreenhouseWebAppInitializer implements WebApplicationInitializer {
+
+	/**
+	 * Register and configure all Servlet container components necessary to power the
+	 * Greenhouse web application.
+	 */
+	@Override
+	public void onStartup(ServletContext sc) throws ServletException {
+		System.out.println("GreenhouseWebAppInitializer.onStartup()");
+
+		// Create the 'root' Spring application context
+		AnnotationConfigWebApplicationContext root = new AnnotationConfigWebApplicationContext();
+		root.scan("com.springsource.greenhouse.config");
+		root.getEnvironment().setDefaultProfiles("embedded");
+
+		// Manages the lifecycle of the root application context
+		sc.addListener(new ContextLoaderListener(root));
+
+		// Allows attributes to be accessed on the next request
+		sc.addFilter("flashMapFilter", FlashMapFilter.class)
+			.addMappingForUrlPatterns(null, false, "/*");
+
+		// Enables support for DELETE and PUT request methods with web browser clients
+		sc.addFilter("hiddenHttpMethodFilter", HiddenHttpMethodFilter.class)
+			.addMappingForUrlPatterns(null, false, "/*");
+
+		// Secures the application
+		sc.addFilter("securityFilter", new DelegatingFilterProxy("springSecurityFilterChain"))
+			.addMappingForUrlPatterns(null, false, "/*");
+
+		// Handles requests into the application
+		ServletRegistration.Dynamic appServlet =
+			sc.addServlet("appServlet", new DispatcherServlet(new GenericWebApplicationContext()));
+		appServlet.setLoadOnStartup(1);
+		Set<String> mappingConflicts = appServlet.addMapping("/");
+		if (!mappingConflicts.isEmpty()) {
+			throw new IllegalStateException("'appServlet' could not be mapped to '/' due " +
+				"to an existing mapping. This is a known issue under Tomcat versions " +
+				"<= 7.0.14; see https://issues.apache.org/bugzilla/show_bug.cgi?id=51278");
+		}
+
+		// H2 Database Console for managing the app's database
+		ServletRegistration.Dynamic h2Servlet =
+			sc.addServlet("H2Console", org.h2.server.web.WebServlet.class);
+		h2Servlet.setInitParameter("webAllowOthers", "true");
+		h2Servlet.setLoadOnStartup(2);
+		h2Servlet.addMapping("/admin/h2/*");
+	}
+
+}