{"id":62667,"date":"2016-12-20T07:00:18","date_gmt":"2016-12-20T05:00:18","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=62667"},"modified":"2016-12-19T22:19:24","modified_gmt":"2016-12-19T20:19:24","slug":"spring-boot-application-context-hierarchy","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2016\/12\/spring-boot-application-context-hierarchy.html","title":{"rendered":"Spring Boot and Application Context Hierarchy"},"content":{"rendered":"<p>Spring Boot supports a simple way of specifying a\u00a0<a href=\"http:\/\/docs.spring.io\/spring-boot\/docs\/current\/reference\/htmlsingle\/#howto-build-an-application-context-hierarchy\">Spring application context hierarchy<\/a>.<\/p>\n<p>This post is simply demonstrating this feature, I am yet to find a good use of it in the projects I have worked on.\u00a0<a href=\"http:\/\/projects.spring.io\/spring-cloud\/\">Spring Cloud<\/a> uses this feature for creating a\u00a0<a href=\"http:\/\/cloud.spring.io\/spring-cloud-static\/spring-cloud.html#_the_bootstrap_application_context\">bootstrap context<\/a> where properties are loaded up, if required, from an external configuration server which is made available to the main application context later on.<\/p>\n<p>To quickly take a step back &#8211; a\u00a0<a href=\"http:\/\/docs.spring.io\/spring\/docs\/current\/spring-framework-reference\/htmlsingle\/#beans-basics\">Spring Application Context<\/a> manages the lifecycle of all the beans registered with it. Application Context hierarchies provide a way to reuse beans, beans defined in the parent context is accessible in the child contexts.<\/p>\n<p>Consider a contrived use-case of using multiple application contexts and application context hierarchy &#8211; this is to provide two different ports with different set of endpoints at each of these ports.<\/p>\n<p><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/ContextHierarchy.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-62673\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/ContextHierarchy.png\" alt=\"\" width=\"561\" height=\"488\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/ContextHierarchy.png 561w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/ContextHierarchy-300x261.png 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><\/a><div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<p>Child1 and Child2 are typical Spring Boot Applications, along these lines:<\/p>\n<pre class=\"brush:java\">package child1;\r\n\r\nimport org.springframework.beans.factory.annotation.Value;\r\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\r\nimport org.springframework.context.annotation.Bean;\r\nimport org.springframework.context.annotation.PropertySource;\r\nimport root.RootBean;\r\n\r\n@SpringBootApplication\r\n@PropertySource(\"classpath:\/child1.properties\")\r\npublic class ChildContext1 {\r\n\r\n    @Bean\r\n    public ChildBean1 childBean(RootBean rootBean, @Value(\"${root.property}\") String someProperty) {\r\n        return new ChildBean1(rootBean, someProperty);\r\n    }\r\n}<\/pre>\n<p>Each of the application resides in its own root package to avoid collisions when scanning for beans. Note that the bean in the child contexts depend on a bean that is expected to come from the root context.<\/p>\n<p>The port to listen on is provided as properties, since the two contexts are expected to listen on different ports I have explicitly specified the property file to load with a content along these lines:<\/p>\n<pre class=\"brush:java\">server.port=8080\r\nspring.application.name=child1<\/pre>\n<p>Given this set-up, Spring Boot provides a fluid interface to load up the root context and the two child contexts:<\/p>\n<pre class=\"brush:java\">SpringApplicationBuilder appBuilder =\r\n       new SpringApplicationBuilder()\r\n               .parent(RootContext.class)\r\n               .child(ChildContext1.class)\r\n               .sibling(ChildContext2.class);\r\n\r\nConfigurableApplicationContext applicationContext  = appBuilder.run();<\/pre>\n<p>The application context returned by the SpringBootApplicationBuilder appears to be the final one in the chain, defined via ChildContext2 above.<\/p>\n<p>If the application is now started up, there would be a root context with two different child contexts each exposing an endpoint via a different port. A visualization via the \/beans actuator endpoint shows this:<\/p>\n<p><a href=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/beanshierarchy.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-62674\" src=\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/beanshierarchy.png\" alt=\"\" width=\"640\" height=\"625\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/beanshierarchy.png 640w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2016\/12\/beanshierarchy-300x293.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p>Not everything is clean though, there are errors displayed in the console related to exporting jmx endpoints, however these are informational and don&#8217;t appear to affect the start-up.<\/p>\n<p>Samples are available in\u00a0<a href=\"https:\/\/github.com\/bijukunjummen\/sample-spring-boot-hierarchy\">my github repo<\/a><\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td><span class=\"reference\">Reference: <\/span><\/td>\n<td><a href=\"http:\/\/www.java-allandsundry.com\/2016\/12\/spring-boot-and-application-context.html\">Spring Boot and Application Context Hierarchy<\/a> from our <a href=\"http:\/\/www.javacodegeeks.com\/join-us\/jcg\/\">JCG partner<\/a> Biju Kunjummen at the <a href=\"http:\/\/www.java-allandsundry.com\/\">all and sundry<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Spring Boot supports a simple way of specifying a\u00a0Spring application context hierarchy. This post is simply demonstrating this feature, I am yet to find a good use of it in the projects I have worked on.\u00a0Spring Cloud uses this feature for creating a\u00a0bootstrap context where properties are loaded up, if required, from an external configuration &hellip;<\/p>\n","protected":false},"author":236,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[30,854],"class_list":["post-62667","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring","tag-spring-boot"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spring Boot and Application Context Hierarchy - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Spring Boot supports a simple way of specifying a\u00a0Spring application context hierarchy. This post is simply demonstrating this feature, I am yet to find a\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/2016\/12\/spring-boot-application-context-hierarchy.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spring Boot and Application Context Hierarchy - Java Code Geeks\" \/>\n<meta property=\"og:description\" content=\"Spring Boot supports a simple way of specifying a\u00a0Spring application context hierarchy. 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