Error Messages as Key Value Pairs - from a Properties File in classpath - Spring boot 2.0 - spring

Question

We are currently on a Spring Boot Version 1.x
We have Error Messages (Error Key -> Error Code) pairs in our error.properties file (this is in the class path).
We leveraged PropertiesConfigurationFactory to get these Error Key and Error Code pairs in to a POJO, this POJO had a Map
Hence very convenient to be used across our application to get an Error code for a given Error Key.
What is its equivalent in Spring Boot 2.x ?.

Answer 1

Assuming you have error.properties file with the below contents:
errors.error1=101
errors.error2=102
errors.error3=103
A simple spring boot app that demonstrates the injection of these properties :
package snmaddula.remittance;
import java.util.Map;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
#SpringBootApplication
#ConfigurationProperties
#PropertySource("classpath:error.properties")
public class DemoApplication {
private Map<String, Integer> errors;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
#Bean
public CommandLineRunner cli() {
return (args) -> {
System.out.println(errors); // you can print and see the error properties injected to this map.
};
}
public void setErrors(Map<String, Integer> errors) {
this.errors = errors;
}
}
With the use of #PropertySource and #ConfigurationProperties we can enable property injection provided we have a setter method for our attribute.
When you run this program, you can see the properties getting printed on to the console as I added a CommandLineRunner cli() {..} to show the working of it.
The working sample is available on GitHub.