{"id":227924,"date":"2024-07-15T19:40:30","date_gmt":"2024-07-15T19:40:30","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=227924"},"modified":"2024-07-15T19:40:30","modified_gmt":"2024-07-15T19:40:30","slug":"how-to-get-value-from-application-yml-file-in-java","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/","title":{"rendered":"How to get value from application.yml file in Java?"},"content":{"rendered":"<p>The <b>application.yml<\/b> file is a configuration file used in Java applications that follows the YAML format. It contains various settings and values that can be accessed by the application during runtime. In this article, we will explore different ways to retrieve values from the <b>application.yml<\/b> file in a Java program.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#1_Using_Spring_Boots_Value_Annotation\" title=\"1. Using Spring Boot&#8217;s @Value Annotation\">1. Using Spring Boot&#8217;s @Value Annotation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#2_Using_Spring_Environment_object\" title=\"2. Using Spring Environment object\">2. Using Spring Environment object<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#3_Using_PropertySourcesPlaceholderConfigurer\" title=\"3. Using PropertySourcesPlaceholderConfigurer\">3. Using PropertySourcesPlaceholderConfigurer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#FAQs\" title=\"FAQs:\">FAQs:<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q1_How_to_access_nested_properties_from_the_applicationyml_file\" title=\"Q1. How to access nested properties from the application.yml file?\">Q1. How to access nested properties from the application.yml file?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q2_Can_I_use_placeholders_in_the_applicationyml_file\" title=\"Q2. Can I use placeholders in the application.yml file?\">Q2. Can I use placeholders in the application.yml file?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q3_How_to_use_default_values_in_case_a_property_is_not_defined\" title=\"Q3. How to use default values in case a property is not defined?\">Q3. How to use default values in case a property is not defined?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q4_Can_I_access_properties_from_multiple_different_yml_files\" title=\"Q4. Can I access properties from multiple different .yml files?\">Q4. Can I access properties from multiple different .yml files?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q5_How_to_access_properties_from_the_applicationyml_file_in_a_static_context\" title=\"Q5. How to access properties from the application.yml file in a static context?\">Q5. How to access properties from the application.yml file in a static context?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q6_What_if_there_are_conflicts_with_property_names\" title=\"Q6. What if there are conflicts with property names?\">Q6. What if there are conflicts with property names?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q7_Can_I_change_the_applicationyml_file_location\" title=\"Q7. Can I change the application.yml file location?\">Q7. Can I change the application.yml file location?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q8_How_to_use_environment_variables_in_the_applicationyml_file\" title=\"Q8. How to use environment variables in the application.yml file?\">Q8. How to use environment variables in the application.yml file?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q9_Can_I_reload_the_applicationyml_file_during_runtime\" title=\"Q9. Can I reload the application.yml file during runtime?\">Q9. Can I reload the application.yml file during runtime?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q10_How_to_use_profiles_in_the_applicationyml_file\" title=\"Q10. How to use profiles in the application.yml file?\">Q10. How to use profiles in the application.yml file?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q11_How_to_override_properties_from_the_applicationyml_file_in_test_scenarios\" title=\"Q11. How to override properties from the application.yml file in test scenarios?\">Q11. How to override properties from the application.yml file in test scenarios?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#Q12_How_to_access_properties_from_an_external_yml_file\" title=\"Q12. How to access properties from an external .yml file?\">Q12. How to access properties from an external .yml file?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_Using_Spring_Boots_Value_Annotation\"><\/span>1. Using Spring Boot&#8217;s @Value Annotation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Spring Boot provides a convenient way to access values from the <b>application.yml<\/b> file using the <b>@Value<\/b> annotation. By specifying the property name in the annotation, Spring Boot will inject the corresponding value into the annotated field or method parameter.<\/p>\n<p>&#8220;`java<br \/>\nimport org.springframework.beans.factory.annotation.Value;<br \/>\nimport org.springframework.stereotype.Component;<\/p>\n<p>@Component<br \/>\npublic class MyComponent {<br \/>\n    @Value(&#8220;${my.property.key}&#8221;)<br \/>\n    private String myProperty;<\/p>\n<p>    \/\/ &#8230;<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>In the example above, the value of the property with the key <b>my.property.key<\/b> in the <b>application.yml<\/b> file will be injected into the <b>myProperty<\/b> field.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_Using_Spring_Environment_object\"><\/span>2. Using Spring Environment object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Another approach to access values from the <b>application.yml<\/b> file in Java is by using the <b>Environment<\/b> object provided by Spring.<\/p>\n<p>&#8220;`java<br \/>\nimport org.springframework.context.EnvironmentAware;<br \/>\nimport org.springframework.core.env.Environment;<br \/>\nimport org.springframework.stereotype.Component;<\/p>\n<p>@Component<br \/>\npublic class MyComponent implements EnvironmentAware {<\/p>\n<p>    private Environment environment;<\/p>\n<p>    @Override<br \/>\n    public void setEnvironment(Environment environment) {<br \/>\n        this.environment = environment;<br \/>\n    }<\/p>\n<p>    public void someMethod() {<br \/>\n        String myProperty = environment.getProperty(&#8220;my.property.key&#8221;);<br \/>\n        \/\/ &#8230;<br \/>\n    }<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>By implementing the <b>EnvironmentAware<\/b> interface, we can obtain the <b>Environment<\/b> object. With this object, we can retrieve the value of the desired property using the <b>getProperty<\/b> method.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Using_PropertySourcesPlaceholderConfigurer\"><\/span>3. Using PropertySourcesPlaceholderConfigurer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If you&#8217;re not using Spring Boot, you can still access values from the <b>application.yml<\/b> file using the <b>PropertySourcesPlaceholderConfigurer<\/b> bean.<\/p>\n<p>&#8220;`java<br \/>\nimport org.springframework.beans.factory.annotation.Value;<br \/>\nimport org.springframework.context.annotation.Bean;<br \/>\nimport org.springframework.context.annotation.Configuration;<br \/>\nimport org.springframework.context.support.PropertySourcesPlaceholderConfigurer;<\/p>\n<p>@Configuration<br \/>\npublic class AppConfig {<\/p>\n<p>    @Value(&#8220;${my.property.key}&#8221;)<br \/>\n    private String myProperty;<\/p>\n<p>    @Bean<br \/>\n    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {<br \/>\n        return new PropertySourcesPlaceholderConfigurer();<br \/>\n    }<\/p>\n<p>    \/\/ &#8230;<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>In this approach, we create a <b>PropertySourcesPlaceholderConfigurer<\/b> bean and use the <b>@Value<\/b> annotation to inject the desired property into the field. This way, values from the <b>application.yml<\/b> file can be accessed in the Java program.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Q1_How_to_access_nested_properties_from_the_applicationyml_file\"><\/span>Q1. How to access nested properties from the application.yml file?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A1. To access nested properties, you can separate the keys using dots. For example, <code>${parent.child.property}<\/code>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q2_Can_I_use_placeholders_in_the_applicationyml_file\"><\/span>Q2. Can I use placeholders in the application.yml file?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A2. Yes, you can use placeholders like <code>${property}<\/code> in the <b>application.yml<\/b> file and provide their values through environment variables or system properties.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q3_How_to_use_default_values_in_case_a_property_is_not_defined\"><\/span>Q3. How to use default values in case a property is not defined?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A3. By appending a default value using the colon symbol (:), you can define a default value for a property. For example, <code>${property:defaultValue}<\/code>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q4_Can_I_access_properties_from_multiple_different_yml_files\"><\/span>Q4. Can I access properties from multiple different <b>.yml<\/b> files?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A4. Yes, you can specify multiple configuration files using the <code>@PropertySource<\/code> annotation, and their properties will be accessible as well.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q5_How_to_access_properties_from_the_applicationyml_file_in_a_static_context\"><\/span>Q5. How to access properties from the <b>application.yml<\/b> file in a static context?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A5. You can use the <code>ConfigurableApplicationContext<\/code> to retrieve the property values in a static context using <code>getBean<\/code> or <code>getEnvironment<\/code>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q6_What_if_there_are_conflicts_with_property_names\"><\/span>Q6. What if there are conflicts with property names?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A6. If there are conflicts with property names, the last defined source will typically take precedence.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q7_Can_I_change_the_applicationyml_file_location\"><\/span>Q7. Can I change the <b>application.yml<\/b> file location?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A7. Yes, you can change the location of the <b>application.yml<\/b> file by setting the <code>spring.config.name<\/code> and <code>spring.config.location<\/code> properties in <b>application.properties<\/b> or as command-line arguments.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q8_How_to_use_environment_variables_in_the_applicationyml_file\"><\/span>Q8. How to use environment variables in the <b>application.yml<\/b> file?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A8. You can use environment variables by referencing them in the <b>application.yml<\/b> file using the <code>${env.VARIABLE_NAME}<\/code> syntax.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q9_Can_I_reload_the_applicationyml_file_during_runtime\"><\/span>Q9. Can I reload the <b>application.yml<\/b> file during runtime?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A9. By configuring a <b>@ConfigurationProperties<\/b> bean with the <b>@RefreshScope<\/b> annotation, you can reload the properties from the <b>application.yml<\/b> file during runtime using Spring Cloud Config or Spring Cloud Bus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q10_How_to_use_profiles_in_the_applicationyml_file\"><\/span>Q10. How to use profiles in the <b>application.yml<\/b> file?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A10. You can define profiles in the <b>application.yml<\/b> file using the <b>spring.profiles.active<\/b> property, which allows you to have different configurations for different environments.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q11_How_to_override_properties_from_the_applicationyml_file_in_test_scenarios\"><\/span>Q11. How to override properties from the <b>application.yml<\/b> file in test scenarios?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A11. You can use the <b>@TestPropertySource<\/b> annotation to override properties from the <b>application.yml<\/b> file specifically for test scenarios.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q12_How_to_access_properties_from_an_external_yml_file\"><\/span>Q12. How to access properties from an external <b>.yml<\/b> file?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>A12. By using the <b>PropertySourcesPlaceholderConfigurer<\/b> bean, you can specify an external <b>.yml<\/b> file in the <b>application.properties<\/b> or <b>application.yml<\/b> file, and its properties will be accessible in the Java program.<\/p>\n<p>In conclusion, retrieving values from the <b>application.yml<\/b> file in a Java application can be easily accomplished using various approaches provided by Spring Boot or the Spring framework itself. With the appropriate annotations and configurations, accessing configuration properties becomes seamless, allowing for flexible and dynamic application behavior.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The application.yml file is a configuration file used in Java applications that follows the YAML format. It contains various settings and values that can be accessed by the application during runtime. In this article, we will explore different ways to retrieve values from the application.yml file in a Java program. 1. Using Spring Boot&#8217;s @Value &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to get value from application.yml file in Java?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-get-value-from-application-yml-file-in-java\/#more-227924\">Read more<span class=\"screen-reader-text\">How to get value from application.yml file in Java?<\/span><\/a><\/p>\n","protected":false},"author":57,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-227924","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to get value from application.yml file in Java?<\/title>\n<meta name=\"description\" content=\"The application.yml file is a configuration file used in Java applications that follows the YAML format. 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