@value in spring boot not giving value from application.properties

Question

I am trying to read value from application properties into a class annotated with

@Configuration public class testClass { @Value("${com.x.y.z.dummy.name}") private String name;

once I run the code at a method in this class annotated with @Bean:

 @Bean public Helper helper(X x){ System.out.println(this.name); }

Here the output is -> ${com.x.y.z.dummy.name} instead of the value of ${com.x.y.z.dummy.name} in the application.properties . I tried @Autowired and tried reading from environment variable too. Not sure what might be happening. Could anyone help with this? Adding application.properties:

com.x.y.z.dummy.name=localhost com.x.y.z.dummy.host=8888

If it's a Spring Boot application, it should normally work as described. If it's a Spring Core application, you should register a PropertySourcesPlaceholderConfigurer as a bean post-processor (using static keywork) — Nico Van Belle
– Nico Van Belle, Commented Feb 20, 2021 at 10:09

gere · Accepted Answer · 2021-02-21 13:45:16Z

I would suggest to search in your project for a Bean that returns a PropertySourcesPlaceholderConfigurer. That object could be configured to set a different prefix instead of "${". Doing so would result in the behavior that you are describing.

For example, creating this class I was able to reproduce your problem.

import org.springframework.context.annotation.Bean; import org.springframework.context.support.PropertySourcesPlaceholderConfigurer; public class PrefixConfiguration { @Bean public static PropertySourcesPlaceholderConfigurer configure(){ PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer = new PropertySourcesPlaceholderConfigurer(); propertySourcesPlaceholderConfigurer.setPlaceholderPrefix("%{"); propertySourcesPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true); return propertySourcesPlaceholderConfigurer; } }

Your Bean could be different, and it could be there for a good reason, so don't blindly delete it without further investigation.

Thank you @gere , I don't see the PropertySourcesPlaceholderConfigurer at all , I am facing this problem post an upgrade of a dependency which is a third party . Once I added the PropertySourcesPlaceholderConfigurer it seems to be working fine
Then the PropertySourcesPlaceholderConfigurer is configured inside the third party library in a way that changes the normal behavior. When you add it yourself, you are declaring it again, and doing so, make it work normally again.
Hey why should this -> static PropertySourcesPlaceholderConfigurer configure() be a static method ? Could you please help me understand ?
Because the Spring docs suggest to do so: look here for the paragraph "BeanFactoryPostProcessor-returning @Bean methods": docs.spring.io/spring-framework/docs/current/javadoc-api/org/… it explains why and it uses a bean returning exactly the PropertySourcesPlaceholderConfigurer as an example.

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