Spring Boot application properties value not populating

Question

I have a very simple Spring Boot app that I m trying to get working with some externalised configuration  I ve tried to follow the information on the spring boot documentation however I m hitting a road block   When I run the app below the external configuration in the application properties file does not get populated into the variable within the bean  I m sure I m doing something stupid  thanks for any suggestions   MyBean java  located in  src main java foo bar    package foo bar   import org springframework beans factory annotation Value  import org springframework boot context properties ConfigurationProperties  import org springframework boot context properties EnableConfigurationProperties  import org springframework stereotype Component    Component public class MyBean         Value    some prop        private String prop       public MyBean             System out println                         prop                                     Application java  located in  src main java foo    package foo   import foo bar MyBean   import org springframework beans factory annotation Autowired  import org springframework beans factory annotation Value  import org springframework boot autoconfigure EnableAutoConfiguration  import org springframework boot SpringApplication  import org springframework context annotation ComponentScan  import org springframework context annotation Configuration    Configuration  ComponentScan  EnableAutoConfiguration public class Application         Autowired     private MyBean myBean       public static void main String   args            SpringApplication run Application class  args             application properties  located in  src main resources    some prop aabbcc   Log output when executing the Spring Boot app   grb-macbook-pro properties-test-app grahamrb  java -jar   build libs properties-test-app-0 1 0 jar                                                                                                                                                                                                                                                               Spring Boot            v1 1 5 RELEASE   2014-09-10 21 28 42 149  INFO 16554 ---             main  foo Application                            Starting Application on grb-macbook-pro local with PID 16554   Users grahamrb Dropbox dev-projects spring-apps properties-test-app build libs properties-test-app-0 1 0 jar started by grahamrb in  Users grahamrb Dropbox dev-projects spring-apps properties-test-app  2014-09-10 21 28 42 196  INFO 16554 ---             main  ationConfigEmbeddedWebApplicationContext   Refreshing org springframework boot context embedded AnnotationConfigEmbeddedWebApplicationContext 67e38ec8  startup date  Wed Sep 10 21 28 42 EST 2014   root of context hierarchy 2014-09-10 21 28 42 828  INFO 16554 ---             main  o s b f s DefaultListableBeanFactory       Overriding bean definition for bean  beanNameViewResolver   replacing  Root bean  class  null   scope   abstract false  lazyInit false  autowireMode 3  dependencyCheck 0  autowireCandidate true  primary false  factoryBeanName org springframework boot autoconfigure web ErrorMvcAutoConfiguration WhitelabelErrorViewConfiguration  factoryMethodName beanNameViewResolver  initMethodName null  destroyMethodName  inferred   defined in class path resource  org springframework boot autoconfigure web ErrorMvcAutoConfiguration WhitelabelErrorViewConfiguration class   with  Root bean  class  null   scope   abstract false  lazyInit false  autowireMode 3  dependencyCheck 0  autowireCandidate true  primary false  factoryBeanName org springframework boot autoconfigure web WebMvcAutoConfiguration WebMvcAutoConfigurationAdapter  factoryMethodName beanNameViewResolver  initMethodName null  destroyMethodName  inferred   defined in class path resource  org springframework boot autoconfigure web WebMvcAutoConfiguration WebMvcAutoConfigurationAdapter class   2014-09-10 21 28 43 592  INFO 16554 ---             main   t TomcatEmbeddedServletContainerFactory   Server initialized with port  8080 2014-09-10 21 28 43 784  INFO 16554 ---             main  o apache catalina core StandardService     Starting service Tomcat 2014-09-10 21 28 43 785  INFO 16554 ---             main  org apache catalina core StandardEngine    Starting Servlet Engine  Apache Tomcat 7 0 54 2014-09-10 21 28 43 889  INFO 16554 ---  ost-startStop-1  o a c c C  Tomcat   localhost              Initializing Spring embedded WebApplicationContext 2014-09-10 21 28 43 889  INFO 16554 ---  ost-startStop-1  o s web context ContextLoader              Root WebApplicationContext  initialization completed in 1695 ms 2014-09-10 21 28 44 391  INFO 16554 ---  ost-startStop-1  o s b c e ServletRegistrationBean          Mapping servlet   dispatcherServlet  to     2014-09-10 21 28 44 393  INFO 16554 ---  ost-startStop-1  o s b c embedded FilterRegistrationBean    Mapping filter   hiddenHttpMethodFilter  to                          null                   2014-09-10 21 28 44 606  INFO 16554 ---             main  o s w s handler SimpleUrlHandlerMapping    Mapped URL path      favicon ico  onto handler of type  class org springframework web servlet resource ResourceHttpRequestHandler  2014-09-10 21 28 44 679  INFO 16554 ---             main  s w s m m a RequestMappingHandlerMapping   Mapped     error  methods    params    headers    consumes    produces    custom      onto public org springframework http ResponseEntity lt java util Map lt java lang String  java lang Object gt  gt  org springframework boot autoconfigure web BasicErrorController error javax servlet http HttpServletRequest  2014-09-10 21 28 44 679  INFO 16554 ---             main  s w s m m a RequestMappingHandlerMapping   Mapped     error  methods    params    headers    consumes    produces  text html  custom      onto public org springframework web servlet ModelAndView org springframework boot autoconfigure web BasicErrorController errorHtml javax servlet http HttpServletRequest  2014-09-10 21 28 44 716  INFO 16554 ---             main  o s w s handler SimpleUrlHandlerMapping    Mapped URL path       onto handler of type  class org springframework web servlet resource ResourceHttpRequestHandler  2014-09-10 21 28 44 716  INFO 16554 ---             main  o s w s handler SimpleUrlHandlerMapping    Mapped URL path   webjars     onto handler of type  class org springframework web servlet resource ResourceHttpRequestHandler  2014-09-10 21 28 44 902  INFO 16554 ---             main  o s j e a AnnotationMBeanExporter          Registering beans for JMX exposure on startup 2014-09-10 21 28 44 963  INFO 16554 ---             main  s b c e t TomcatEmbeddedServletContainer   Tomcat started on port s   8080 http 2014-09-10 21 28 44 965  INFO 16554 ---             main  foo Application                            Started Application in 3 316 seconds  JVM running for 3 822   C2014-09-10 21 28 54 223  INFO 16554 ---         Thread-2  ationConfigEmbeddedWebApplicationContext   Closing org springframework boot context embedded AnnotationConfigEmbeddedWebApplicationContext 67e38ec8  startup date  Wed Sep 10 21 28 42 EST 2014   root of context hierarchy 2014-09-10 21 28 54 225  INFO 16554 ---         Thread-2  o s j e a AnnotationMBeanExporter          Unregistering JMX-exposed beans on shutdown

User · Answer

Using Environment class we can get application  Properties values   Autowired   private Environment env    and access using   String password  env getProperty your property key

User · Answer

If you re working in a large multi-module project  with several different application properties files  then try adding your value to the parent project s property file    If you are unsure which is your parent project  check your project s pom xml file  for a  lt parent gt  tag    This solved the issue for me

User · Answer

follow these steps  1 - create your configuration class like below you can see  import org springframework context annotation Bean  import org springframework context annotation Configuration  import org springframework beans factory annotation Value    Configuration public class YourConfiguration          passing the key which you set in application properties      Value    some pro        private String somePro         getting the value from that key which you set in application properties      Bean     public String getsomePro             return somePro            2 - when you have a configuration class then inject in the variable from a configuration where you need    Component public class YourService         Autowired     private String getsomePro          now you have a value in getsomePro variable automatically

User · Answer

The way you are performing the injection of the property will not work  because the injection is done after the constructor is called   You need to do one of the following   Better solution   Component public class MyBean        private final String prop        Autowired     public MyBean  Value    some prop    String prop            this prop   prop          System out println                         prop                                     Solution that will work but is less testable and slightly less readable   Component public class MyBean         Value    some prop        private String prop       public MyBean                  PostConstruct     public void init             System out println                         prop                                     Also note that is not Spring Boot specific but applies to any Spring application

User · Answer

Actually  For me below works fine    Component public class MyBean       public static String prop       Value    some prop       public void setProp String prop          this prop  prop           public MyBean                PostConstruct    public void init           System out println                         prop                                     Now whereever i want  just invoke  MyBean prop  it will return value

User · Answer

The user  geoand  is right in pointing out the reasons here and giving a solution  But a better approach is to encapsulate your configuration into a separate class  say SystemContiguration java class and then inject this class into what ever services you want to use those fields    Your current way  grahamrb  of reading config values directly into services is error prone and would cause refactoring headaches if config setting name is changed

User · Answer

This answer may or may not be applicable to your case     Once I had a similar symptom and I double checked my code many times and all looked good but the  Value setting was still not taking effect   And then after doing File  gt  Invalidate Cache   Restart with my IntelliJ  my IDE   the problem went away      This is very easy to try so may be worth a shot

User · Answer

You can use Environment Class to get data    Autowired private Environment env  String prop  env getProperty  some prop

[java] Spring Boot application.properties value not populating

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