[bs-141] Add Bootstrap WebApplicationInitializer got traditional wars

[#50806851] [bs-141] First class escape hatch from jar to war for web applications

pom.xml

@@ -219,6 +219,10 @@
 					<artifactId>maven-exec-plugin</artifactId>
 					<version>1.2.1</version>
 				</plugin>
+				<plugin>
+					<artifactId>maven-war-plugin</artifactId>
+					<version>2.3</version>
+				</plugin>
 			</plugins>
 		</pluginManagement>
 		<plugins>

spring-bootstrap/src/main/java/org/springframework/bootstrap/properties/ServerProperties.java

@@ -68,6 +68,10 @@ public class ServerProperties {
 		this.address = address;
 	}
 
+	public void setLoader(String value) {
+		// no op
+	}
+
 	public static class Tomcat {
 
 		private String accessLogPattern;

spring-bootstrap/src/main/java/org/springframework/bootstrap/web/BootstrapServletInitializer.java

@@ -0,0 +1,55 @@
+package org.springframework.bootstrap.web;
+
+import javax.servlet.Filter;
+
+import org.springframework.util.ClassUtils;
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.filter.DelegatingFilterProxy;
+import org.springframework.web.servlet.FrameworkServlet;
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+/**
+ * <p>
+ * A handy opinionated {@link WebApplicationInitializer} for applications that only have
+ * one Spring servlet, and no more than a single filter (which itself is only enabled when
+ * Spring Security is detected). If your application is more complicated consider using
+ * one of the other WebApplicationInitializers.
+ * <p>
+ * 
+ * <p>
+ * Note that a WebApplicationInitializer is only needed if you are building a war file and
+ * deploying it. If you prefer to run an embedded container (we do) then you won't need
+ * this at all.
+ * </p>
+ * 
+ * @author Dave Syer
+ * 
+ */
+public abstract class BootstrapServletInitializer extends
+		AbstractAnnotationConfigDispatcherServletInitializer {
+
+	@Override
+	protected Class<?>[] getRootConfigClasses() {
+		return null;
+	}
+
+	@Override
+	protected String[] getServletMappings() {
+		return new String[] { "/" };
+	}
+
+	@Override
+	protected Filter[] getServletFilters() {
+		if (ClassUtils.isPresent(
+				"org.springframework.security.config.annotation.web.EnableWebSecurity",
+				null)) {
+			DelegatingFilterProxy filter = new DelegatingFilterProxy(
+					"springSecurityFilterChain");
+			filter.setContextAttribute(FrameworkServlet.SERVLET_CONTEXT_PREFIX
+					+ "dispatcher");
+			return new Filter[] { filter };
+		}
+		return new Filter[0];
+	}
+
+}