Using `@ConfigurationProperties` annotation on `@Bean` Method

Question

Could someone give a MWE of how to use the @ConfigurationProperties annotation directly on a @Bean method?

I have seen countless examples of it being used on class definitions - but no examples yet for @Bean methods.

To quote the documentation:

• Add this to a class definition or a @Bean method
• @Target(value={TYPE,METHOD})

So, I think there is a possibility and an intended use as well - but unluckily I am unable to figure it out.

Answer 1

spring.datasource.url = [url] spring.datasource.username = [username] spring.datasource.password = [password] spring.datasource.driverClassName = oracle.jdbc.OracleDriver 

@Bean @ConfigurationProperties(prefix="spring.datasource") public DataSource dataSource() {     return new DataSource(); } 

Here the DataSource class has proeprties url, username, password, driverClassName, so spring boot maps them to the created object.

Example of the DataSource class:

public class DataSource {     private String url;     private String driverClassName;     private String username;     private String password;     //getters & setters, etc. } 

In other words this has the same effect as if you initialize some bean with stereotype annotations(@Component, @Service, etc.) e.g.

@Component @ConfigurationProperties(prefix="spring.datasource") public class DataSource {     private String url;     private String driverClassName;     private String username;     private String password;     //getters & setters, etc. }