{"id":88457,"date":"2019-02-15T10:00:08","date_gmt":"2019-02-15T08:00:08","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=88457"},"modified":"2019-02-18T14:24:08","modified_gmt":"2019-02-18T12:24:08","slug":"spring-constructor-dependency-injection-example","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/02\/spring-constructor-dependency-injection-example.html","title":{"rendered":"Spring Constructor Dependency Injection Example"},"content":{"rendered":"<p>Welcome to <strong>Spring Constructor Dependency Injection Example<\/strong> guide. The <strong>Constructor based Dependency Injection <\/strong>is a type of Spring <strong>Dependency Injection<\/strong>. The other type of dependency injections are <em>Setter Injection<\/em> &amp; Field Injection.<\/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-setter-injection-example\/\">Example of Setter Injection in Spring<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-field-injection-example\/\">Field Injection in Spring<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-field-setter-constructor-injection\/\">Dependency Injection \u2013 Constructor vs field injection<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-dependency-injection-inversion-control\/\">Dependency Injection and Inversion of Control<\/a><\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">Constructor Based Dependency Injection<\/h3>\n<p>It is a type of Spring <strong><a href=\"http:\/\/www.amitph.com\/spring-dependency-injection-inversion-control\/\">Dependency Injection<\/a><\/strong>, where object\u2019s constructor is used to inject dependencies. This type of injection is safer as the objects won\u2019t get created if the dependencies aren\u2019t available or dependencies cannot be resolved.<\/p>\n<p>To understand, how the <em>Constructor&nbsp;based&nbsp;Dependency&nbsp;Injection<\/em> works in Spring \u2013 obviously \u2013 we need a Spring Application. Consider we have very simple Spring Application called as <em>DogsService<\/em>, which is a dummy service.<\/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=\"https:\/\/www.javacodegeeks.com\/2019\/02\/introduction-spring-framework.html\">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-bean-scopes-guide\/\">Spring Beans \u2013 Singleton Vs Prototype<\/a><\/li>\n<li><a href=\"http:\/\/www.amitph.com\/spring-autowired-guide\/\">Autowiring in Spring<\/a><\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">The Dogs DAO<\/h3>\n<p>The DAO class doesn\u2019t have any dependency. We have added a no-argument constructor with print statement.<\/p>\n<div>\n<div id=\"highlighter_23094\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">com.amitph.spring.dogs.repo.Dog;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.stereotype.Component;<\/code><\/div>\n<div class=\"line number3 index2 alt2\">&nbsp;<\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">java.util.List;<\/code><\/div>\n<div class=\"line number5 index4 alt2\">&nbsp;<\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java color1\">@Component<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">class<\/code> <code class=\"java plain\">DogsDao {<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">DogsDao(){<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsDao no-arg constructor called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">List&lt;Dog&gt; getAllDogs() {<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsDao.getAllDogs called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">return<\/code> <code class=\"java keyword\">null<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 class=\"wp-block-heading\">The Dogs Service<\/h3>\n<p>The Service <strong>HAS-A<\/strong> <code>DogsDao<\/code>. The service class has a <em>setter<\/em> method, a <em>no-argument constructor<\/em>, and a <em>parameterised constructor<\/em> with respective print statements. <br \/>Note: The parameterised constructor is annotated with <code>@Autowrired<\/code>.<\/p>\n<div>\n<div id=\"highlighter_999109\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<div class=\"line number24 index23 alt1\">24<\/div>\n<div class=\"line number25 index24 alt2\">25<\/div>\n<div class=\"line number26 index25 alt1\">26<\/div>\n<div class=\"line number27 index26 alt2\">27<\/div>\n<div class=\"line number28 index27 alt1\">28<\/div>\n<div class=\"line number29 index28 alt2\">29<\/div>\n<div class=\"line number30 index29 alt1\">30<\/div>\n<div class=\"line number31 index30 alt2\">31<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">com.amitph.spring.dogs.dao.DogsDao;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">com.amitph.spring.dogs.repo.Dog;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.beans.factory.annotation.Autowired;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.stereotype.Component;<\/code><\/div>\n<div class=\"line number5 index4 alt2\">&nbsp;<\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">java.util.List;<\/code><\/div>\n<div class=\"line number7 index6 alt2\">&nbsp;<\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java color1\">@Component<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">class<\/code> <code class=\"java plain\">DogsService {<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">private<\/code> <code class=\"java plain\">DogsDao dao;<\/code><\/div>\n<div class=\"line number11 index10 alt2\">&nbsp;<\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">List&lt;Dog&gt; getDogs() {<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsService.getDogs called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">return<\/code> <code class=\"java plain\">dao.getAllDogs();<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number16 index15 alt1\">&nbsp;<\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">void<\/code> <code class=\"java plain\">setDao(DogsDao dao) {<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsService setter called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.dao = dao;<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number21 index20 alt2\">&nbsp;<\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">DogsService(){<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsService no-arg constructor called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number25 index24 alt2\">&nbsp;<\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java color1\">@Autowired<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">DogsService(DogsDao dao) {<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsService arg constructor called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.dao = dao;<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 class=\"wp-block-heading\">The Dogs Controller<\/h3>\n<p>The Controller <strong>HAS-A<\/strong> <code>DogsService<\/code>. The controller class also has one setter, a no-argument constructor and a parameterised constructor with respective print statements.<br \/>Note: The parameterised constructor is annotated with <code>@Autowrired<\/code>.<\/p>\n<div>\n<div id=\"highlighter_212906\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<div class=\"line number24 index23 alt1\">24<\/div>\n<div class=\"line number25 index24 alt2\">25<\/div>\n<div class=\"line number26 index25 alt1\">26<\/div>\n<div class=\"line number27 index26 alt2\">27<\/div>\n<div class=\"line number28 index27 alt1\">28<\/div>\n<div class=\"line number29 index28 alt2\">29<\/div>\n<div class=\"line number30 index29 alt1\">30<\/div>\n<div class=\"line number31 index30 alt2\">31<\/div>\n<div class=\"line number32 index31 alt1\">32<\/div>\n<div class=\"line number33 index32 alt2\">33<\/div>\n<div class=\"line number34 index33 alt1\">34<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">com.amitph.spring.dogs.repo.Dog;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">com.amitph.spring.dogs.service.DogsService;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.beans.factory.annotation.Autowired;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.web.bind.annotation.GetMapping;<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.web.bind.annotation.RequestMapping;<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.springframework.web.bind.annotation.RestController;<\/code><\/div>\n<div class=\"line number7 index6 alt2\">&nbsp;<\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">java.util.List;<\/code><\/div>\n<div class=\"line number9 index8 alt2\">&nbsp;<\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java color1\">@RestController<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java color1\">@RequestMapping<\/code><code class=\"java plain\">(<\/code><code class=\"java string\">\"\/dogs\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">class<\/code> <code class=\"java plain\">DogsController {<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">private<\/code> <code class=\"java plain\">DogsService service;<\/code><\/div>\n<div class=\"line number14 index13 alt1\">&nbsp;<\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java color1\">@GetMapping<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">List&lt;Dog&gt; getDogs() {<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">return<\/code> <code class=\"java plain\">service.getDogs();<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number19 index18 alt2\">&nbsp;<\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">void<\/code> <code class=\"java plain\">setService(DogsService service) {<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsController setter called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.service = service;<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number24 index23 alt1\">&nbsp;<\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">DogsController(){<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsController no-arg constructor called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number28 index27 alt1\">&nbsp;<\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java color1\">@Autowired<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">DogsController(DogsService service) {<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">System.out.println(<\/code><code class=\"java string\">\"DogsController arg constructor called\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.service = service;<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number34 index33 alt1\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 class=\"wp-block-heading\">Run The Application<\/h3>\n<p>When we start the application, we should see below logs on the console.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<div>\n<div id=\"highlighter_525440\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<div class=\"line number24 index23 alt1\">24<\/div>\n<div class=\"line number25 index24 alt2\">25<\/div>\n<div class=\"line number26 index25 alt1\">26<\/div>\n<div class=\"line number27 index26 alt2\">27<\/div>\n<div class=\"line number28 index27 alt1\">28<\/div>\n<div class=\"line number29 index28 alt2\">29<\/div>\n<div class=\"line number30 index29 alt1\">30<\/div>\n<div class=\"line number31 index30 alt2\">31<\/div>\n<div class=\"line number32 index31 alt1\">32<\/div>\n<div class=\"line number33 index32 alt2\">33<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">46.812<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] com.amitph.spring.dogs.Application&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Starting Application on Amitsofficemac.gateway with PID <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">(\/Users\/aphaltankar\/Workspace\/personal\/dog-service-jpa\/out\/production\/classes started by aphaltankar in \/Users\/aphaltankar\/Workspace\/personal\/dog-service-jpa)<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">46.815<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] com.amitph.spring.dogs.Application&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : No active profile set, falling back to <\/code><code class=\"java keyword\">default<\/code> <code class=\"java plain\">profiles: <\/code><code class=\"java keyword\">default<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.379<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.428<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 45ms. Found <\/code><code class=\"java value\">1<\/code> <code class=\"java plain\">repository interfaces.<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.682<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] trationDelegate$BeanPostProcessorChecker : Bean <\/code><code class=\"java string\">'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration'<\/code> <code class=\"java plain\">of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$EnhancerBySpringCGLIB$86296a04] is not eligible <\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">getting processed by all BeanPostProcessors (<\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">example: not eligible <\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">auto-proxying)<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.931<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.embedded.tomcat.TomcatWebServer&nbsp; : Tomcat initialized with port(s): <\/code><code class=\"java value\">8080<\/code> <code class=\"java plain\">(http)<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.944<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.apache.catalina.core.StandardService&nbsp;&nbsp; : Starting service [Tomcat]<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.944<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] org.apache.catalina.core.StandardEngine&nbsp; : Starting Servlet Engine: Apache Tomcat\/<\/code><code class=\"java value\">9.0<\/code><code class=\"java plain\">.<\/code><code class=\"java value\">12<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">47.949<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.a.catalina.core.AprLifecycleListener&nbsp;&nbsp; : 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:.]<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.021<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.a.c.c.C.[Tomcat].[localhost].[\/]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Initializing Spring embedded WebApplicationContext<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.021<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.web.context.ContextLoader&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Root WebApplicationContext: initialization completed in <\/code><code class=\"java value\">1158<\/code> <code class=\"java plain\">ms<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.042<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.servlet.ServletRegistrationBean&nbsp; : Servlet dispatcherServlet mapped to [\/]<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.045<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.servlet.FilterRegistrationBean&nbsp;&nbsp; : Mapping filter: <\/code><code class=\"java string\">'characterEncodingFilter'<\/code> <code class=\"java plain\">to: [\/*]<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.046<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.servlet.FilterRegistrationBean&nbsp;&nbsp; : Mapping filter: <\/code><code class=\"java string\">'hiddenHttpMethodFilter'<\/code> <code class=\"java plain\">to: [\/*]<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.046<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.servlet.FilterRegistrationBean&nbsp;&nbsp; : Mapping filter: <\/code><code class=\"java string\">'formContentFilter'<\/code> <code class=\"java plain\">to: [\/*]<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.046<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.servlet.FilterRegistrationBean&nbsp;&nbsp; : Mapping filter: <\/code><code class=\"java string\">'requestContextFilter'<\/code> <code class=\"java plain\">to: [\/*]<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.136<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] com.zaxxer.hikari.HikariDataSource&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : HikariPool-<\/code><code class=\"java value\">1<\/code> <code class=\"java plain\">- Starting...<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.230<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] com.zaxxer.hikari.HikariDataSource&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : HikariPool-<\/code><code class=\"java value\">1<\/code> <code class=\"java plain\">- Start completed.<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.322<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.hibernate.jpa.internal.util.LogHelper&nbsp; : HHH000204: Processing PersistenceUnitInfo [<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">name: <\/code><code class=\"java keyword\">default<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">&nbsp;&nbsp;&nbsp;&nbsp;<\/code><code class=\"java plain\">...]<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.366<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] org.hibernate.Version&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : HHH000412: Hibernate Core {<\/code><code class=\"java value\">5.3<\/code><code class=\"java plain\">.<\/code><code class=\"java value\">7<\/code><code class=\"java plain\">.Final}<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.366<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] org.hibernate.cfg.Environment&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : HHH000206: hibernate.properties not found<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.461<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.hibernate.annotations.common.Version&nbsp;&nbsp; : HCANN000001: Hibernate Commons Annotations {<\/code><code class=\"java value\">5.0<\/code><code class=\"java plain\">.<\/code><code class=\"java value\">4<\/code><code class=\"java plain\">.Final}<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.546<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] org.hibernate.dialect.Dialect&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">48.960<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory <\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">persistence unit <\/code><code class=\"java string\">'default'<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java plain\">DogsDao no-arg constructor called<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java plain\">DogsService arg constructor called<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java plain\">DogsController arg constructor called<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">49.304<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.s.concurrent.ThreadPoolTaskExecutor&nbsp; : Initializing ExecutorService <\/code><code class=\"java string\">'applicationTaskExecutor'<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">49.330<\/code>&nbsp; <code class=\"java plain\">WARN <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by <\/code><code class=\"java keyword\">default<\/code><code class=\"java plain\">. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable <\/code><code class=\"java keyword\">this<\/code> <code class=\"java plain\">warning<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">49.479<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] o.s.b.w.embedded.tomcat.TomcatWebServer&nbsp; : Tomcat started on port(s): <\/code><code class=\"java value\">8080<\/code> <code class=\"java plain\">(http) with context path <\/code><code class=\"java string\">''<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"java value\">2019<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">02<\/code><code class=\"java plain\">-<\/code><code class=\"java value\">04<\/code> <code class=\"java value\">19<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">56<\/code><code class=\"java plain\">:<\/code><code class=\"java value\">49.482<\/code>&nbsp; <code class=\"java plain\">INFO <\/code><code class=\"java value\">68906<\/code> <code class=\"java plain\">--- [&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; main] com.amitph.spring.dogs.Application&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Started Application in <\/code><code class=\"java value\">3.003<\/code> <code class=\"java plain\">seconds (JVM running <\/code><code class=\"java keyword\">for<\/code> <code class=\"java value\">3.521<\/code><code class=\"java plain\">)<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<ul class=\"wp-block-list\">\n<li>Line #27: As expected, the no-argument constructor of DAO is called.<\/li>\n<li>Line #28: A parameterised constructor of <code>DogsService<\/code> is called along with an instance of DAO created at line #27.<\/li>\n<li>Line #29: A parameterised constructor of the controller is called along with a service instance created at line #28.<\/li>\n<\/ul>\n<p>Notice here that neither the <em>setters<\/em> nor the <em>no-argument\u00a0constructors<\/em> were invoked by Spring. <strong>The dependencies were injected purely by means of <\/strong><em><strong>Constructors<\/strong><\/em>. This approach is preferred over <a href=\"http:\/\/www.amitph.com\/spring-setter-injection-example\/\">Spring Setter Injection<\/a> and <a href=\"http:\/\/www.amitph.com\/spring-field-injection-example\/\">Field Injection in Spring<\/a>.<\/p>\n<h3 class=\"wp-block-heading\">Summary<\/h3>\n<p>In this Spring Constructor Dependency Injection Example guide, you learnt how <strong>Constructor<\/strong> based <strong>Dependency&nbsp;Injection<\/strong> works in a <strong>Spring&nbsp;Application<\/strong>. We also wrote executable code with Constructor Injection.<\/p>\n<p>When constructor is used to set instance variables on an objects, it is called as Constructor Injection. Before you dig deeper into using Spring Framework it is important to understand <a href=\"http:\/\/www.amitph.com\/spring-field-setter-constructor-injection\/\">Difference Between Setter Injection Vs Field Injection Vs Constructor Injection<\/a>.<\/p>\n<p>Happy Coding !!<\/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-constructor-injection-example\/\" target=\"_blank\" rel=\"noopener\">Spring Constructor 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>Welcome to Spring Constructor Dependency Injection Example guide. The Constructor based Dependency Injection is a type of Spring Dependency Injection. The other type of dependency injections are Setter Injection &amp; Field Injection. More on Spring Dependency Injection: Example of Setter Injection in Spring Field Injection in Spring Dependency Injection \u2013 Constructor vs field injection Dependency &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-88457","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 Constructor Dependency Injection Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about Spring Constructor? 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