Extract code snippets from mvc-servlet.adoc

Closes gh-36175

framework-docs/modules/ROOT/pages/web/webmvc/mvc-servlet.adoc

@@ -14,55 +14,12 @@ In turn, the `DispatcherServlet` uses Spring configuration to discover
 the delegate components it needs for request mapping, view resolution, exception
 handling, xref:web/webmvc/mvc-servlet/special-bean-types.adoc[and more].
 
-The following example of the Java configuration registers and initializes
+The following example shows the programmatic registration and initialization of
 the `DispatcherServlet`, which is auto-detected by the Servlet container
-(see xref:web/webmvc/mvc-servlet/container-config.adoc[Servlet Config]):
+(see xref:web/webmvc/mvc-servlet/container-config.adoc[Servlet Config]), and the
+equivalent `web.xml`:
 
-[tabs]
+include-code::./MyWebApplicationInitializer[tag=snippet,indent=0]
-======
-Java::
-+
-[source,java,indent=0,subs="verbatim,quotes"]
-----
-	public class MyWebApplicationInitializer implements WebApplicationInitializer {
-
-		@Override
-		public void onStartup(ServletContext servletContext) {
-
-			// Load Spring web application configuration
-			AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
-			context.register(AppConfig.class);
-
-			// Create and register the DispatcherServlet
-			DispatcherServlet servlet = new DispatcherServlet(context);
-			ServletRegistration.Dynamic registration = servletContext.addServlet("app", servlet);
-			registration.setLoadOnStartup(1);
-			registration.addMapping("/app/*");
-		}
-	}
-----
-
-Kotlin::
-+
-[source,kotlin,indent=0,subs="verbatim,quotes"]
-----
-	class MyWebApplicationInitializer : WebApplicationInitializer {
-
-		override fun onStartup(servletContext: ServletContext) {
-
-			// Load Spring web application configuration
-			val context = AnnotationConfigWebApplicationContext()
-			context.register(AppConfig::class.java)
-
-			// Create and register the DispatcherServlet
-			val servlet = DispatcherServlet(context)
-			val registration = servletContext.addServlet("app", servlet)
-			registration.setLoadOnStartup(1)
-			registration.addMapping("/app/*")
-		}
-	}
-----
-======
 
 NOTE: In addition to using the ServletContext API directly, you can also extend
 `AbstractAnnotationConfigDispatcherServletInitializer` and override specific methods
@@ -73,39 +30,6 @@ alternative to `AnnotationConfigWebApplicationContext`. See the
 {spring-framework-api}/web/context/support/GenericWebApplicationContext.html[`GenericWebApplicationContext`]
 javadoc for details.
 
-The following example of `web.xml` configuration registers and initializes the `DispatcherServlet`:
-
-[source,xml,indent=0,subs="verbatim,quotes"]
-----
-<web-app>
-
-	<listener>
-		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
-	</listener>
-
-	<context-param>
-		<param-name>contextConfigLocation</param-name>
-		<param-value>/WEB-INF/app-context.xml</param-value>
-	</context-param>
-
-	<servlet>
-		<servlet-name>app</servlet-name>
-		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
-		<init-param>
-			<param-name>contextConfigLocation</param-name>
-			<param-value></param-value>
-		</init-param>
-		<load-on-startup>1</load-on-startup>
-	</servlet>
-
-	<servlet-mapping>
-		<servlet-name>app</servlet-name>
-		<url-pattern>/app/*</url-pattern>
-	</servlet-mapping>
-
-</web-app>
-----
-
 NOTE: Spring Boot follows a different initialization sequence. Rather than hooking into
 the lifecycle of the Servlet container, Spring Boot uses Spring configuration to
 bootstrap itself and the embedded Servlet container. `Filter` and `Servlet` declarations

framework-docs/src/main/java/org/springframework/docs/web/webmvc/mvcservlet/AppConfig.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2002-2025 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
+ *
+ *      https://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 org.springframework.docs.web.webmvc.mvcservlet;
+
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+}

framework-docs/src/main/java/org/springframework/docs/web/webmvc/mvcservlet/MyWebApplicationInitializer.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2002-2025 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
+ *
+ *      https://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 org.springframework.docs.web.webmvc.mvcservlet;
+
+import jakarta.servlet.ServletContext;
+import jakarta.servlet.ServletRegistration;
+
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+// tag::snippet[]
+public class MyWebApplicationInitializer implements WebApplicationInitializer {
+
+	@Override
+	public void onStartup(ServletContext servletContext) {
+
+		// Load Spring web application configuration
+		AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
+		context.register(AppConfig.class);
+
+		// Create and register the DispatcherServlet
+		DispatcherServlet servlet = new DispatcherServlet(context);
+		ServletRegistration.Dynamic registration = servletContext.addServlet("app", servlet);
+		registration.setLoadOnStartup(1);
+		registration.addMapping("/app/*");
+	}
+}
+// end::snippet[]

framework-docs/src/main/kotlin/org/springframework/docs/web/webmvc/mvcservlet/AppConfig.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2002-2025 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
+ *
+ *      https://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 org.springframework.docs.web.webmvc.mvcservlet
+
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class AppConfig

framework-docs/src/main/kotlin/org/springframework/docs/web/webmvc/mvcservlet/MyWebApplicationInitializer.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2025 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
+ *
+ *      https://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 org.springframework.docs.web.webmvc.mvcservlet
+
+import jakarta.servlet.ServletContext
+import org.springframework.web.WebApplicationInitializer
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext
+import org.springframework.web.servlet.DispatcherServlet
+
+// tag::snippet[]
+class MyWebApplicationInitializer : WebApplicationInitializer {
+
+	override fun onStartup(servletContext: ServletContext) {
+
+		// Load Spring web application configuration
+		val context = AnnotationConfigWebApplicationContext()
+		context.register(AppConfig::class.java)
+
+		// Create and register the DispatcherServlet
+		val servlet = DispatcherServlet(context)
+		val registration = servletContext.addServlet("app", servlet)
+		registration.setLoadOnStartup(1)
+		registration.addMapping("/app/*")
+	}
+}
+// end::snippet[]

framework-docs/src/main/resources/org/springframework/docs/web/webmvc/mvcservlet/MyWebApplicationInitializer.xml

@@ -0,0 +1,29 @@
+<!-- tag::snippet[] -->
+<web-app>
+
+	<listener>
+		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
+	</listener>
+
+	<context-param>
+		<param-name>contextConfigLocation</param-name>
+		<param-value>/WEB-INF/app-context.xml</param-value>
+	</context-param>
+
+	<servlet>
+		<servlet-name>app</servlet-name>
+		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+		<init-param>
+			<param-name>contextConfigLocation</param-name>
+			<param-value></param-value>
+		</init-param>
+		<load-on-startup>1</load-on-startup>
+	</servlet>
+
+	<servlet-mapping>
+		<servlet-name>app</servlet-name>
+		<url-pattern>/app/*</url-pattern>
+	</servlet-mapping>
+
+</web-app>
+<!-- end::snippet[] -->