M01 Q32 Where can properties in the environment come from?

Property Sources in Spring Application vary based on the type of applications that is being executed:

• Standalone Application
• Servlet Container Application
• Spring Boot Application

Property Sources for Standalone Spring Framework Application:

• Properties Files
• JVM system properties
• System Environment Variables

Property Sources for Servlet Container Spring Framework Application:

• Properties Files
• JVM system properties
• System Environment Variables
• JNDI
• ServletConfig init parameters
• ServletContext init parameters

Property Sources for Spring Boot Application:

• Devtools properties from ~/.spring-boot-devtools.properties (when devtools is active)
• @TestPropertySource annotations on tests
• Properties attribute in @SpringBootTest tests
• Command-line arguments
• Properties from SPRINGAPPLICATIONJSON property
• ServletConfig init parameters
• ServletContext init parameters
• JNDI attributes from java:comp/env
• JVM system properties
• System Environment Variables
• RandomValuePropertySource - ${random.*}
• application-{profile}.properties and YAML variants - outside of jar
• application-{profile}.properties and YAML variants – inside jar
• application.properties and YAML variants - outside of jar
• application.properties and YAML variants - inside jar
• @PropertySource annotations on @Configuration classes
• Default properties - SpringApplication.setDefaultProperties