{"id":88250,"date":"2019-02-13T10:00:46","date_gmt":"2019-02-13T08:00:46","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=88250"},"modified":"2019-02-12T11:38:00","modified_gmt":"2019-02-12T09:38:00","slug":"spring-setter-dependency-injection-example","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/02\/spring-setter-dependency-injection-example.html","title":{"rendered":"Spring Setter Dependency Injection Example"},"content":{"rendered":"<p>Learn how to write <strong>Spring Setter Dependency Injection&nbsp;Example<\/strong>. The <strong>Setter Injection<\/strong> is a type of <strong>Spring Dependency Injection<\/strong>. Spring supports Field Injection, Setter Injection as well as Constructor injection to inject dependencies in a Spring managed bean. Scope of this tutorial is limited to Setter Injections.<\/p>\n<p><b><i>More on Spring Dependency Injection:<\/i><\/b><\/p>\n<ul class=\"wp-block-list\">\n<li><a href=\"http:\/\/www.amitph.com\/spring-constructor-injection-example\/\">Spring Constructor Dependency Injection Example<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-field-injection-example\/\">Spring Field Dependency Injection Example<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-field-setter-constructor-injection\/\">Spring Dependency Injection \u2013 Field vs Setter vs Constructor Injection<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-dependency-injection-inversion-control\/\">Spring Dependency Injection and Inversion of Control<\/a><\/li>\n<\/ul>\n<p>Consider, we have a <strong>DogsService<\/strong>, which is a Spring based REST Service.<\/p>\n<p>We will write a <code>DogsController<\/code>, <code>DogsService<\/code>, and a <code>DogsDao<\/code>. This is a dummy service which does nothing. Intention here is to see how the Spring Dependency Injection works with Setter methods.<\/p>\n<p>Don\u2019t know how to write Spring Boot Rest Service?<\/p>\n<p>Read this: <a href=\"http:\/\/www.amitph.com\/spring-boot-rest-service\/\">Spring Boot Rest Service<\/a><\/p>\n<p><b>Want to learn more about Spring Framework ?<\/b><\/p>\n<p>Read this:<\/p>\n<ul class=\"wp-block-list\">\n<li><a href=\"http:\/\/www.amitph.com\/introduction-to-spring-framework\/\">Introduction to Spring Framework<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-framework-architecture\/\">Spring Framework Architecture<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-dependency-injection-inversion-control\/\">Spring Dependency Injection and Inversion of Control <\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-boot-rest-service\/\">Spring Boot Rest Service <\/a><\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">DogsDao.java<\/h3>\n<p>There are no fields hence no dependency. We have added a no-argument constructor with a print message.<\/p>\n<pre class=\"brush:java\">\npackage com.amitph.spring.dogs.dao;\n \nimport com.amitph.spring.dogs.repo.Dog;\nimport org.springframework.stereotype.Component;\n \nimport java.util.List;\n \n@Component\npublic class DogsDao {\n    public DogsDao(){\n        System.out.println(\"DogsDao no-arg constructor called\");\n    }\n    public List&lt;Dog&gt; getAllDogs() {\n        System.out.println(\"DogsDao.getAllDogs called\");\n        return null;\n    }\n}\n<\/pre>\n<h3 class=\"wp-block-heading\">DogsService.java<\/h3>\n<p>The <code>DogsService<\/code> depends on <code>DogsDao<\/code>. In the class below the <em>setter<\/em> method is annotated with <code>@Autowired<\/code>. To see how the <strong>Setter&nbsp;Injection<\/strong> works we have added a print statement in the <em>setter<\/em> method. Along with a <em>setter<\/em> method, we have also added a <em>no-argument constructor<\/em> and a <em>parameterised constructor<\/em> with respective print messages.<\/p>\n<pre class=\"brush:java\">\npackage com.amitph.spring.dogs.service;\n \nimport com.amitph.spring.dogs.dao.DogsDao;\nimport com.amitph.spring.dogs.repo.Dog;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Component;\n \nimport java.util.List;\n \n@Component\npublic class DogsService {\n    private DogsDao dao;\n \n    public List&lt;Dog&gt; getDogs() {\n        System.out.println(\"DogsService.getDogs called\");\n        return dao.getAllDogs();\n    }\n \n    @Autowired\n    public void setDao(DogsDao dao) {\n        System.out.println(\"DogsService setter called\");\n        this.dao = dao;\n    }\n \n    public DogsService(){\n        System.out.println(\"DogsService no-arg constructor called\");\n    }\n    public DogsService(DogsDao dao) {\n        System.out.println(\"DogsService arg constructor called\");\n        this.dao = dao;\n    }\n}\n<\/pre>\n<h3 class=\"wp-block-heading\">DogsController.java<\/h3>\n<p>The <code>DogsController<\/code> depends upon <code>DogsService<\/code>. The <em>setter<\/em> is annotated with <code>@Autowired<\/code> and has a print statement. Along with the <em>setter<\/em> method, we have also added a <em>no-argument <\/em>and a <em>parameterised constructor<\/em> along with respective print messages.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\"brush:java\">\npackage com.amitph.spring.dogs.web;\n \nimport com.amitph.spring.dogs.repo.Dog;\nimport com.amitph.spring.dogs.service.DogsService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.GetMapping;\nimport org.springframework.web.bind.annotation.RequestMapping;\nimport org.springframework.web.bind.annotation.RestController;\n \nimport java.util.List;\n \n@RestController\n@RequestMapping(\"\/dogs\")\npublic class DogsController {\n    private DogsService service;\n \n    @GetMapping\n    public List&lt;Dog&gt; getDogs() {\n        return service.getDogs();\n    }\n \n    @Autowired\n    public void setService(DogsService service) {\n        System.out.println(\"DogsController setter called\");\n        this.service = service;\n    }\n}\n<\/pre>\n<h3 class=\"wp-block-heading\">Application Startup<\/h3>\n<pre class=\"brush:bash; wrap-lines:false\">\n \n  .   ____          _            __ _ _\n \/\\\\ \/ ___'_ __ _ _(_)_ __  __ _ \\ \\ \\ \\\n( ( )\\___ | '_ | '_| | '_ \\\/ _` | \\ \\ \\ \\\n \\\\\/  ___)| |_)| | | | | || (_| |  ) ) ) )\n  '  |____| .__|_| |_|_| |_\\__, | \/ \/ \/ \/\n =========|_|==============|___\/=\/_\/_\/_\/\n :: Spring Boot ::        (v2.1.0.RELEASE)\n \n2019-02-04 19:06:17.058  INFO 68545 --- [           main] com.amitph.spring.dogs.Application       : Starting Application on Amitsofficemac.gateway with PID 68545 (\/Users\/aphaltankar\/Workspace\/personal\/dog-service-jpa\/out\/production\/classes started by aphaltankar in \/Users\/aphaltankar\/Workspace\/personal\/dog-service-jpa)\n2019-02-04 19:06:17.061  INFO 68545 --- [           main] com.amitph.spring.dogs.Application       : No active profile set, falling back to default profiles: default\n2019-02-04 19:06:17.670  INFO 68545 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.\n2019-02-04 19:06:17.724  INFO 68545 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 48ms. Found 1 repository interfaces.\n2019-02-04 19:06:17.992  INFO 68545 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$4a5366ed] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)\n2019-02-04 19:06:18.225  INFO 68545 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)\n2019-02-04 19:06:18.237  INFO 68545 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]\n2019-02-04 19:06:18.237  INFO 68545 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat\/9.0.12\n2019-02-04 19:06:18.242  INFO 68545 --- [           main] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [\/Users\/aphaltankar\/Library\/Java\/Extensions:\/Library\/Java\/Extensions:\/Network\/Library\/Java\/Extensions:\/System\/Library\/Java\/Extensions:\/usr\/lib\/java:.]\n2019-02-04 19:06:18.315  INFO 68545 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[\/]       : Initializing Spring embedded WebApplicationContext\n2019-02-04 19:06:18.315  INFO 68545 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1205 ms\n2019-02-04 19:06:18.339  INFO 68545 --- [           main] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [\/]\n2019-02-04 19:06:18.342  INFO 68545 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [\/*]\n2019-02-04 19:06:18.342  INFO 68545 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [\/*]\n2019-02-04 19:06:18.342  INFO 68545 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'formContentFilter' to: [\/*]\n2019-02-04 19:06:18.342  INFO 68545 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [\/*]\n2019-02-04 19:06:18.434  INFO 68545 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...\n2019-02-04 19:06:18.524  INFO 68545 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.\n2019-02-04 19:06:18.645  INFO 68545 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [\n\tname: default\n\t...]\n2019-02-04 19:06:18.690  INFO 68545 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.7.Final}\n2019-02-04 19:06:18.691  INFO 68545 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found\n2019-02-04 19:06:18.779  INFO 68545 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}\n2019-02-04 19:06:18.868  INFO 68545 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect\n2019-02-04 19:06:19.279  INFO 68545 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'\nDogsDao no-arg constructor called\nDogsService no-arg constructor called\nDogsService setter called\nDogsController no-arg constructor called\nDogsController setter called\n2019-02-04 19:06:19.650  INFO 68545 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'\n2019-02-04 19:06:19.681  WARN 68545 --- [           main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning\n2019-02-04 19:06:19.856  INFO 68545 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''\n2019-02-04 19:06:19.859  INFO 68545 --- [           main] com.amitph.spring.dogs.Application       : Started Application in 3.138 seconds (JVM running for 3.647)\n \n<\/pre>\n<p>What happened here is the Spring first tried to instantiate <code>DogsController<\/code> and found a dependency over <code>DogsService<\/code>. Hence, it went to instantiate <code>DogsService<\/code>, which in-turn has a dependency over <code>DogsDao<\/code>. Hence the <code>DogsDao<\/code> is the first to get instantiated, then <code>DogsService<\/code> and finally the <code>DogsController<\/code>.<\/p>\n<p>Let\u2019s see what happened in detail.<\/p>\n<ul class=\"wp-block-list\">\n<li>Line #36: No-argument constructor of <code>DogsDao<\/code> is called.<\/li>\n<li>Line #37: No-argument constructor of <code>DogsService<\/code> is called. <em>Note: the parameterised constructor never got called<\/em>.<\/li>\n<li>Line #38: Setter of <code>DogsService<\/code> is called. Where instance of <code>DogsDao<\/code> (created at line #36) is injected.<\/li>\n<li>Line #39: No-argument constructor of <code>DogsController<\/code> is called.<\/li>\n<li>Line #40: Setter of <code>DogsController<\/code> is called. The <code>DogsService<\/code> instance (created in line #37) is injected.<\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">Summary<\/h3>\n<p>You learnt <strong>How&nbsp;to&nbsp;write&nbsp;a&nbsp;Setter&nbsp;Injection&nbsp;in&nbsp;a&nbsp;Spring&nbsp;Application<\/strong>. In case of <strong>Setter&nbsp;Injection<\/strong>, the <em>setter<\/em> methods are annotated with <code>@Autowired<\/code>. Spring will first use the no-argument constructor to instantiate the bean and then call <em>setter<\/em> methods to inject the dependencies.<\/p>\n<p>In the coming tutorial we will see how the <strong>Constructor Based Injection<\/strong> works.<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>\n<p>Published on Java Code Geeks with permission by Amit Phaltankar, partner at our <a href=\"\/\/www.javacodegeeks.com\/join-us\/jcg\/\" target=\"_blank\" rel=\"noopener\">JCG program<\/a>. See the original article here: <a href=\"http:\/\/www.amitph.com\/spring-setter-injection-example\/\" target=\"_blank\" rel=\"noopener\">Spring Setter Dependency Injection Example<\/a><\/p>\n<p>Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to write Spring Setter Dependency Injection&nbsp;Example. The Setter Injection is a type of Spring Dependency Injection. Spring supports Field Injection, Setter Injection as well as Constructor injection to inject dependencies in a Spring managed bean. Scope of this tutorial is limited to Setter Injections. More on Spring Dependency Injection: Spring Constructor Dependency Injection &hellip;<\/p>\n","protected":false},"author":75543,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[30],"class_list":["post-88250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spring Setter Dependency Injection Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Spring Setter Dependency? 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