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Project to demonstrate spring boot refresh issue

Problem: Main/Application context's Environment is not providing application.properties based property source to the call backs of implementations of ApplicationContextInitializer during /actuator/refresh end point call

  • application.properties based property source is not available in the call back methods of the registered custom implementation of ApplicationContextInitializer<ConfigurableApplicationContext> in spring boot app for customization during context refresh via the actuator end point /actuator/refresh.
    This issue started with Spring Boot version 2.4.x and Spring cloud version 2020.0.0. This behaviour is same from Spring Boot 2.4.x version to the latest spring boot version 3.0.x with their respective compatible cloud version. This issue not seen from Spring Boot version 2.1.x to Spring Boot version 2.3.x with their respective compatible cloud versions.

  • We can examine this through the test case applicationPropertiesTest() defined in the test class SpringBoot24RefreshApplicationTest. Similar kind of test will fail with spring boot 2.5.x, spring boot 2.6.x, spring boot 2.7.x and spring boot 3.0.x as well. However, the similar kind of test will not fail with spring boot 2.1.x, spring boot 2.2.x and spring boot 2.3.x with their respective spring cloud compatibility version. So there is a change in behaviour from spring boot 2.3.x to spring boot 2.4.x.

  • Not sure whether it is a bug or intentional behaviour from Spring Boot 2.4.x

  • List of property source names obtained during app start up, and this list has application.properties:

    `

-------------------------Property source names obtained during call back--------------------------------
Property source name: configurationProperties
Property source name: Inlined Test Properties
Property source name: systemProperties
Property source name: systemEnvironment
Property source name: random
Property source name: springCloudClientHostInfo
Property source name: Config resource 'class path resource [application.properties]' via location 'optional:classpath:/'
Property source name: Config resource 'class path resource [bootstrap.properties]' via location 'optional:classpath:/'
Property source name: springCloudDefaultProperties
Property source name: cachedrandom
-------------------------END of Property source names obtained during call back block------------------

`

  • List of property source names obtained during /actuator/refresh call (with HTTP POST call), and this list doesn't has application.properties based property source name:

    `
  -------------------------Property source names obtained during call back--------------------------------
  Property source name: configurationProperties
  Property source name: refreshArgs
  Property source name: systemProperties
  Property source name: systemEnvironment
  Property source name: defaultProperties
  Property source name: Config resource 'class path resource [bootstrap.properties]' via location 'optional:classpath:/'
  Property source name: springCloudDefaultProperties
  Property source name: random
  Property source name: springCloudClientHostInfo
  Property source name: cachedrandom
  -------------------------END of Property source names obtained during call back block------------------

    `

  • The above output can be seen on console when we run the test case SpringBoot24RefreshApplicationTest

Runtime

Project Root: spring-boot-24-refresh Build Tool: Maven Java version: 8+

Test results: The test case defined in SpringBoot21RefreshApplicationTest will fail

Debugging Reference

Method of interest for debug is public void initialize(ConfigurableApplicationContext applicationContext) in the class CustomApplicationContextInitializer