[FIXED] How to get vales of application.prpoperty in spring boot

Issue

I want to access some values from my application.properties file, I tried using below method but not getting value.

application.property file

welcome.message=My message

Mycontroller.java

class="lang-java prettyprint-override">@RestController
class MessageRestController {
    @Autowired MainConfigFiles mainConfigFiles;
      
      @Value("${welcome.message}") 
      private String message;

      @RequestMapping("/message") 
      String getMessage() { 
          return this.message; 
      }

      @RequestMapping("/message2") 
      String getMessage2() { 
          MainConfigFiles a = new MainConfigFiles();
          String msg = a.getMessage2();
          System.out.println("Msg is....."+msg);
          return msg; 
      }

MainConfigFiles.java

@Configuration
@PropertySource(value = "application.properties")
public class MainConfigFiles {
    
     @Value("${welcome.message}") 
     private String message2;
     
    public String getMessage2() {
        return message2;
    }
}

I am able to get the value using
@RequestMapping("/message") which is mentioned in the same file but unable to get the value when using @RequestMapping("/message2") which mentioned in another class.

Solution

First you need to read the welcome.message value from application.properties file and set it to MainConfigFiles. Later use this MainConfigFiles class(that you are already using @Autowire) and get that message.

Modify MainConfigFiles class as below.

public class MainConfigFiles {

Value("${welcome.message}")
private String message2;

Bean
public MainConfigFiles jpaConfig() {

    MainConfigFiles mainConfigFiles = new MainConfigFiles();
    mainConfigFiles.setMessage2(message2);
    return mainConfigFiles;
}

public String getMessage2() {
    return message2;
}

public void setMessage2(String message2) {
    this.message2 = message2;
}
}

This is your MessageRestController.

@RestController
public class MessageRestController {

@Autowired
private MainConfigFiles mainConfigFiles;

@Value("${welcome.message}")
private String message;

@RequestMapping("/message")
String getMessage() {
    return this.message;
}

@RequestMapping("/message2")
String getMessage2() {
    String msg = mainConfigFiles.getMessage2();
    System.out.println("Msg is....."+msg);
    return msg;
}
}

Answered By - abhi_88
Answer Checked By - David Marino (JavaFixing Volunteer)