Spring Configuration<\/em><\/span><\/p>\n<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 https:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\n <modelVersion>4.0.0<\/modelVersion>\n \n <groupId>org.springframework<\/groupId>\n <artifactId>spring-helloworld<\/artifactId>\n <version>0.1.0<\/version>\n \n <parent>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-parent<\/artifactId>\n <version>2.1.4.RELEASE<\/version>\n <\/parent>\n \n <dependencies>\n <dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-web<\/artifactId>\n <\/dependency>\n <dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-test<\/artifactId>\n <scope>test<\/scope>\n <\/dependency>\n <\/dependencies>\n \n <properties>\n <java.version>1.8<\/java.version>\n <\/properties>\n \n \n <build>\n <plugins>\n <plugin>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-maven-plugin<\/artifactId>\n <\/plugin>\n <\/plugins>\n <\/build>\n \n<\/project>\n<\/pre>\nYou can create a HelloWorldController<\/code> class as the web controller. The class is annotated using @RestController<\/code>. Rest Controller is used to handle requests in Spring Model View Controller framework. Annotation @RequestMapping<\/code> is used to annotate the index()<\/code> method. The code for the HelloWorldController<\/code> class is shown below:<\/p>\nHelloWorldController<\/em><\/span><\/p>\npackage helloworld;\nimport org.springframework.web.bind.annotation.RestController;\nimport org.springframework.web.bind.annotation.RequestMapping;\n \n@RestController\npublic class HelloWorldController {\n \n @RequestMapping(\"\/\")\n public String index() {\n return \"Hello World\\n\";\n }\n \n}\n<\/pre>\nHelloWorldApp<\/code> is created as the Spring Boot web application. When the application starts, beans, \u200band settings are wired up dynamically. They are applied to the application context. The code for HelloWorldApp<\/code> class is shown below:HelloWorldApp<\/em><\/p>\nRun Command<\/em><\/span><\/p>\npackage helloworld;\nimport java.util.Arrays;\n \nimport org.springframework.boot.SpringApplication;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\nimport org.springframework.context.ApplicationContext;\n \n@SpringBootApplication\npublic class HelloWorldApp {\n \n public static void main(String[] args) {\n ApplicationContext ctx = SpringApplication.run(HelloWorldApp.class, args);\n \n System.out.println(\"Inspecting the beans\");\n \n String[] beans = ctx.getBeanDefinitionNames();\n Arrays.sort(beans);\n for (String name : beans) {\n System.out.println(\"Bean Name\" +name);\n }\n }\n \n}\n<\/pre>\nMaven is used for building the application. The command below builds the application.<\/p>\n
Maven Build Command<\/em><\/span><\/p>\nmvn package\n<\/pre>\nThe output of the executed command is shown below.<\/p>\n
\n
Maven Command \u2013 Spring<\/figcaption><\/figure>\n<\/div>\nThe jar file spring-helloworld-0.1.0.jar is created. The following command is used for executing the jar file.<\/p>\n
Java Command<\/em><\/span>[ulp id=’7POIYxRf1FUtPpmL’ name=’Spring Framework Cookbook Inline’]<\/p>\njava -jar target\/spring-helloworld-0.1.0.jar\n<\/pre>\nThe output of the Java command is shown as below:<\/p>\n
\n
Spring Hello World Beans<\/figcaption><\/figure>\n<\/div>\nCurl command is invoked on the command line for the execution of index<\/code> method. The method returns a String \u201cHello World\u201d text. @RestController<\/code> aggregates the two annotations @Controller<\/code> and @ResponseBody<\/code>. This results in returning data. The ouput is shown as below.<\/p>\n\n
Curl Command \u2013 Spring<\/figcaption><\/figure>\n<\/div>\n2.9 Unit Tests<\/h3>\n2.9.1 Spring<\/h4>\n In Spring, MockMvc<\/code> is used to send HTTP requests to the DispatcherServlet<\/code>. The assertions are made based on the result obtained from the servlet. @AutoConfigureMockMvc<\/code> annotation is used with @SpringBootTest<\/code> to inject a MockMvc<\/code> instance. The implementation of the Spring Unit Test is shown as below:<\/p>\nHelloWorldControllerTest<\/em><\/span><\/p>\npackage helloworld;\n \nimport static org.hamcrest.Matchers.equalTo;\nimport static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;\nimport static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;\n \nimport org.junit.Test;\nimport org.junit.runner.RunWith;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;\nimport org.springframework.boot.test.context.SpringBootTest;\nimport org.springframework.http.MediaType;\nimport org.springframework.test.context.junit4.SpringRunner;\nimport org.springframework.test.web.servlet.MockMvc;\nimport org.springframework.test.web.servlet.request.MockMvcRequestBuilders;\n \n@RunWith(SpringRunner.class)\n@SpringBootTest\n@AutoConfigureMockMvc\npublic class HelloWorldControllerTest {\n \n @Autowired\n private MockMvc mvc;\n \n @Test\n public void getMessage() throws Exception {\n mvc.perform(MockMvcRequestBuilders.get(\"\/\").accept(MediaType.APPLICATION_JSON))\n .andExpect(status().isOk())\n .andExpect(content().string(equalTo(\"Hello World\\n\")));\n }\n}\n<\/pre>\nMaven command is used to run the unit test. The command is as below :Maven Build Command<\/em><\/p>\nMaven Build Command<\/em><\/span><\/p>\nmvn package\n<\/pre>\nThe output of the executed command is shown below.<\/p>\n
\n
Spring Unit Test<\/figcaption><\/figure>\n<\/div>\n2.10 Best Practices<\/h3>\n In spring framework, the developer can implement custom annotation by implementing ConstraintValidator<\/code>. Custom Annotations help in enhancing the separation of concerns. The developer can use a declarative way of implementing custom validators. You can use annotations like AutoWired<\/code> and Resource<\/code> in spring framework classes. Hibernate provides different query classes. The developer\u200b can pick the right query class based on the context. Bind Parameters are used to map the parameters to the right types. \u200bThe developer\u200b can analyze the queries and optimize them for performance.<\/p>\n2.11 Error Handling<\/h3>\n Spring framework has features to handle exceptions and errors. Errors in REST APIs help in presenting the issues to the clients. <\/p>\n
Spring framework has features like extending the AbstractMonitoringInterceptor class to log the start, end, and duration of a method. Spring AOP helps in defining and writing code which can intercept the execution of the methods for monitoring the performance.<\/p>\n
2.13 Scalability<\/h3>\n Spring framework has MVC, ORM, Messaging and Caching support which is very important for scalability. For scalable deployments, developers and architects need to ensure the servers are stateless or implement sticky sessions with load balancers. Caching helps in reducing the load on the database. <\/p>\n
2.14 Reliability<\/h3>\n Spring Boot has a reliable application development framework. SpringBoot applications are deployed as self-contained units using the profiles feature. <\/p>\n
2.15 Security<\/h3>\n Spring Security for User interfaces and HTTP back ends is based on Servlet Filters. The spring framework provides support for implementing access rules to methods. Spring Security framework has an architecture which is designed to support both authentication and authorization. <\/p>\n
2.16 Logging<\/h3>\n Spring Framework uses Commons Logging for application logging. Different configurations for logging are provided in the framework. They are Java Util Logging, Log4J2, and Logback. Loggers are pre-configured for printing the output on the console or in the configured file. <\/p>\n
2.17 Management<\/h3>\n Spring management features help in configuring a custom port, management server, and SSL configuration management. Spring Boot Actuator configures the enabled HTTP endpoints. Spring framework provides management endpoints which are JMX MBeans. <\/p>\n
2.18 Deployment<\/h3>\n The Spring Server supports the deployment of applications packaged in the formats such as Raw OSGi Bundles, Java EE WAR, Web Bundles, PAR, and Plans. <\/p>\n
3. Download the Source Code<\/h2>\n That was a tutorial about the Spring framework components.<\/p>\n
Download<\/strong> Spring Framework Components Tutorial<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"This is an in-depth article related to the Spring framework components. 1. Introduction Spring Framework helps in creating stand-alone and production-ready applications. Spring Framework features are Spring MVC, JPA, Spring Boot, Micro Containers, and Messaging. It is an open-source software framework used by developers for creating web applications and services. Developers use Java technology stack …<\/p>\n","protected":false},"author":31,"featured_media":1248,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[52],"tags":[1054],"class_list":["post-100488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring","tag-spring"],"yoast_head":"\n
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