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Merge pull request #12 from bobocode-projects/GP-82_dispatcher-servlet-initializer_exercise_MAIN
Gp 82 dispatcher servlet initializer exercise main
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‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/README.MD‎

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# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Hello Spring MVC exercise
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Improve your *Spring MVC* configuration skills 💪
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### Task
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The task is to **configure a typical *Spring MVC* application** separating web and root configs. Your job is to follow
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the instructions in the *todo* section and **implement a proper configuration.**
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To verify your configuration, run `WelcomeWebAppTest.java`
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### Pre-conditions ❗
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You're supposed to be familiar with *Spring MVC*
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### How to start ❓
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* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
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* If you don't have enough knowledge about this domain, check out the [links below](#Related-materials-ℹ)
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* Don't worry if you got stuck, checkout the **exercise/completed** branch and see the final implementation
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### Related materials ℹ
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todo

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>3-0-spring-framework</artifactId>
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<groupId>com.bobocode</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>3-1-1-dispatcher-servlet-initializer</artifactId>
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<packaging>war</packaging>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-webmvc</artifactId>
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<version>5.2.12.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>com.bobocode</groupId>
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<artifactId>java-web-util</artifactId>
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<version>1.0-SNAPSHOT</version>
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<scope>compile</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-war-plugin</artifactId>
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<version>2.6</version>
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<configuration>
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<failOnMissingWebXml>false</failOnMissingWebXml>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/main/java/com/bobocode/config/RootConfig.java‎

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package com.bobocode.config;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.ComponentScan.Filter;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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/**
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* This class provides application root (non-web) configuration for a basic spring application context
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* (containing middle-tire services, datasource, etc.).
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* The configuration must exclude the web layer of the application.
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* <p>
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* todo: mark this class as config
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* todo: enable component scanning for all packages in "com.bobocode"
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* todo: ignore all web related config and beans (ignore @{@link Controller}, ignore {@link EnableWebMvc}) using exclude filter
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*/
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public class RootConfig {
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}

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/main/java/com/bobocode/config/WebAppInitializer.java‎

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package com.bobocode.config;
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import com.bobocode.util.ExerciseNotCompletedException;
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import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
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/**
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* This class is used to configure DispatcherServlet and links it with application config classes
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*/
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public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
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@Override
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protected Class<?>[] getRootConfigClasses() {
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throw new ExerciseNotCompletedException(); //todo: use {@link RootConfig} as root application config class
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}
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@Override
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protected Class<?>[] getServletConfigClasses() {
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throw new ExerciseNotCompletedException(); //todo: use {@link WebConfig} as ServletConfig class
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}
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@Override
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protected String[] getServletMappings() {
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throw new ExerciseNotCompletedException(); //todo: provide default servlet mapping ("/")
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}
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}

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/main/java/com/bobocode/config/WebConfig.java‎

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package com.bobocode.config;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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/**
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* This class provides web (servlet) related configuration. In the Web MVC framework,
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* each DispatcherServlet has its own WebApplicationContext, which inherits all the beans already defined
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* in the root ApplicationContext.
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* <p>
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* todo: mark this class as Spring config class
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* todo: enable web mvc using annotation
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* todo: enable component scanning for package "web"
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*/
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public class WebConfig {
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}

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/main/java/com/bobocode/web/controller/WelcomeController.java‎

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package com.bobocode.web.controller;
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/**
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* Welcome controller that consists of one method that handles get request to "/welcome" and respond with a message.
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* <p>
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* todo: mark this class as Spring controller
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* todo: configure HTTP GET mapping "/welcome" for method {@link WelcomeController#welcome()}
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* todo: tell Spring that {@link WelcomeController#welcome()} method provides response body without view
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*/
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public class WelcomeController {
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public String welcome() {
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return "Welcome to Spring MVC!";
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}
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}

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/test/java/com/bobocode/WebAppConfigurationTest.java‎

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package com.bobocode;
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import com.bobocode.config.RootConfig;
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import com.bobocode.config.WebConfig;
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import com.bobocode.web.controller.WelcomeController;
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import org.junit.jupiter.api.*;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.ComponentScan.Filter;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.FilterType;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.ResponseBody;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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import java.util.List;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
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class WebAppConfigurationTest {
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@Test
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@Order(1)
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@DisplayName("RootConfig class is marked as @Configuration")
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void rootConfigClassIsMarkedAsConfiguration() {
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Configuration configuration = RootConfig.class.getAnnotation(Configuration.class);
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assertNotNull(configuration);
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}
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@Test
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@Order(2)
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@DisplayName("RootConfig class enables @ComponentScan")
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void rootConfigClassEnablesComponentScan() {
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ComponentScan componentScan = RootConfig.class.getAnnotation(ComponentScan.class);
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assertNotNull(componentScan);
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}
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@Test
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@Order(3)
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@DisplayName("RootConfig @ComponentScan contains base packages")
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void rootConfigComponentScanPackages() {
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ComponentScan componentScan = RootConfig.class.getAnnotation(ComponentScan.class);
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String[] packages = componentScan.basePackages();
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if (packages.length == 0) {
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packages = componentScan.value();
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}
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assertThat(packages).contains("com.bobocode");
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}
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@Test
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@Order(4)
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@DisplayName("RootConfig @ComponentScan contains web scan filters")
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void rootConfigComponentScanFilters() {
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ComponentScan componentScan = RootConfig.class.getAnnotation(ComponentScan.class);
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Filter[] filters = componentScan.excludeFilters();
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List<Class> filteredClasses = getFilteredClasses(filters);
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assertThat(filters.length).isEqualTo(2);
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assertThat(filters[0].type()).isEqualTo(FilterType.ANNOTATION);
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assertThat(filters[1].type()).isEqualTo(FilterType.ANNOTATION);
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assertThat(filteredClasses.toArray()).containsExactlyInAnyOrder(EnableWebMvc.class, Controller.class);
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}
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@Test
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@Order(5)
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@DisplayName("WebConfig is marked as @Configuration")
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void webConfigIsMarkedAsConfiguration() {
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Configuration configuration = WebConfig.class.getAnnotation(Configuration.class);
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assertNotNull(configuration);
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}
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@Test
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@Order(6)
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@DisplayName("WebConfig enables @ComponentScan")
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void webConfigEnablesComponentScan() {
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ComponentScan componentScan = WebConfig.class.getAnnotation(ComponentScan.class);
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assertNotNull(componentScan);
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}
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@Test
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@Order(7)
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@DisplayName("WebConfig @ComponentScan contains web packages")
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void webConfigComponentScanPackages() {
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ComponentScan componentScan = WebConfig.class.getAnnotation(ComponentScan.class);
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assertThat(componentScan.basePackages()).contains("com.bobocode.web");
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}
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@Test
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@Order(8)
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@DisplayName("WebConfig is marked with @EnableWebMvc")
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void webConfigEnablesWebMvc() {
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EnableWebMvc enableWebMvc = WebConfig.class.getAnnotation(EnableWebMvc.class);
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assertNotNull(enableWebMvc);
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}
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@Test
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@Order(9)
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@DisplayName("Initializer method is overridden with RootConfig class")
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void initializerRootConfigClasses() {
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WebAppInitializerWrapper webAppInitializerWrapper = new WebAppInitializerWrapper();
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assertThat(webAppInitializerWrapper.getRootConfigClasses()).contains(RootConfig.class);
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}
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@Test
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@Order(10)
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@DisplayName("Initializer method is overridden with WebConfig class")
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void initializerWebConfigClasses() {
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WebAppInitializerWrapper webAppInitializerWrapper = new WebAppInitializerWrapper();
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assertThat(webAppInitializerWrapper.getServletConfigClasses()).contains(WebConfig.class);
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}
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@Test
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@Order(11)
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@DisplayName("Dispatcher Servlet mapping is \"/\"")
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void dispatcherServletMapping() {
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WebAppInitializerWrapper webAppInitializerWrapper = new WebAppInitializerWrapper();
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assertThat(webAppInitializerWrapper.getServletMappings()).contains("/");
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}
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@Test
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@Order(12)
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@DisplayName("WelcomeController is marked as @Controller")
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void welcomeControllerIsMarkedAsController() {
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Controller controller = WelcomeController.class.getAnnotation(Controller.class);
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assertNotNull(controller);
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}
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@Test
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@Order(13)
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@DisplayName("WelcomeController method is marked as Get method")
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void welcomeControllerMethodIsMarkedAsGetMethod() throws NoSuchMethodException {
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GetMapping getMapping = WelcomeController.class.getDeclaredMethod("welcome").getAnnotation(GetMapping.class);
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assertNotNull(getMapping);
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}
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@Test
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@Order(14)
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@DisplayName("WelcomeController Get method is marked properly")
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void welcomeControllerMethodMapping() throws NoSuchMethodException {
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GetMapping getMapping = WelcomeController.class
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.getDeclaredMethod("welcome").getAnnotation(GetMapping.class);
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assertThat(getMapping.value()).contains("/welcome");
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}
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@Test
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@Order(15)
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@DisplayName("WelcomeController Get method is marked as @ResponseBody")
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void welcomeControllerMethodIsMarkedAsResponseBody() throws NoSuchMethodException {
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ResponseBody responseBody = WelcomeController.class
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.getDeclaredMethod("welcome").getAnnotation(ResponseBody.class);
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assertNotNull(responseBody);
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}
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private List<Class> getFilteredClasses(Filter[] filters) {
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return Stream.of(filters).flatMap(filter -> Stream.of(filter.value())).collect(Collectors.toList());
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}
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}

‎3-0-spring-framework/3-1-1-dispatcher-servlet-initializer/src/test/java/com/bobocode/WebAppInitializerWrapper.java‎

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package com.bobocode;
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import com.bobocode.config.WebAppInitializer;
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class WebAppInitializerWrapper extends WebAppInitializer {
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public String[] getServletMappings() {
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return super.getServletMappings();
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}
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public Class[] getRootConfigClasses() {
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return super.getRootConfigClasses();
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}
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public Class<?>[] getServletConfigClasses() {
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return super.getServletConfigClasses();
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}
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}

‎3-0-spring-framework/pom.xml‎

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<modules>
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<module>3-0-1-hello-spring-mvc</module>
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<module>3-1-1-dispatcher-servlet-initializer</module>
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</modules>
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</project>

‎java-web-course-util/java-web-util/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-web-course-util</artifactId>
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<groupId>com.bobocode</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>java-web-util</artifactId>
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<dependencies>
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<dependency>
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<groupId>io.codearte.jfairy</groupId>
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<artifactId>jfairy</artifactId>
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<version>0.5.9</version>
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</dependency>
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</dependencies>
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</project>

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