JAVA EXAMPLE PROGRAMS

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Spring boot property resolution order.


Spring Boot allows you to externalize your configuration so you can work with the same application code in different environments. You can use properties files, YAML files, environment variables and command-line arguments to externalize configuration. Property values can be injected directly into your beans using the @Value annotation, accessed via Spring’s Environment abstraction or bound to structured objects via @ConfigurationProperties.

Spring Boot uses a very particular PropertySource order that is designed to allow sensible overriding of values. Properties are considered in the following order:


  1. Devtools global settings properties on your home directory (~/.spring-boot-devtools.properties when devtools is active).
  2. @TestPropertySource annotations on your tests.
  3. @SpringBootTest#properties annotation attribute on your tests.
  4. Command line arguments.
  5. Properties from SPRING_APPLICATION_JSON (inline JSON embedded in an environment variable or system property)
  6. ServletConfig init parameters.
  7. ServletContext init parameters.
  8. JNDI attributes from java:comp/env.
  9. Java System properties (System.getProperties()).
  10. OS environment variables.
  11. A RandomValuePropertySource that only has properties in random.*.
  12. Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants)
  13. Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants)
  14. Application properties outside of your packaged jar (application.properties and YAML variants).
  15. Application properties packaged inside your jar (application.properties and YAML variants).
  16. @PropertySource annotations on your @Configuration classes.
  17. Default properties (specified using SpringApplication.setDefaultProperties).

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Spring-Boot Examples

  1. Spring-Boot initial setup.
  2. Spring-Boot hello world example
  3. What is spring-boot-starter-parent in Spring-Boot pom.xml file?
  4. What is @SpringBootApplication annotation in spring boot?
  5. What is application.properties in spring boot?
  6. What is @ConfigurationProperties annotation in spring boot?
  7. Spring Boot @ConfigurationProperties example
  8. Spring Boot @ConfigurationProperties Property Validation
  9. Difference between @ConfigurationProperties and @Value
  10. Spring boot web application configurations.
  11. How to run spring boot application through command line?
  12. How to run spring boot as a standalone application (non-web)?
  13. Spring boot property resolution order.
  14. Spring Boot – Profile based properties example.
  15. How to configure logback (SLF4J) logging to spring boot applications?
  16. How to update application context path in spring boot?
  17. How to disable spring logo banner in spring boot?
  18. Spring Data JPA with Spring Boot Applications - Oracle - example
  19. Spring Data JPA with Spring Boot Applications - MySql example
  20. How to configure Spring Boot to show Hibernate SQL Query in logs?
  21. Spring Boot – List all Beans loaded in the ApplicationContext
Knowledge Centre
Interface and its usage
Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
Famous Quotations
Insanity: doing the same thing over and over again and expecting different results.
-- Albert Einstein

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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