Java Spring Boot @Autowired values are null

When I try to print the variable that I have autowired, it prints “null” instead of the value I set it to, “Example.” I can’t quite figure out what I’m missing

In my AppConfig class I have:

@Configuration
public class ApplicationConfiguration {
   @Bean
     public String tableName(){
       return "Example";
     }
}

In my other class, DAOMethods, that I want to autowire the variable in:

@Component
public class DAOMethods {
    @Autowired
    private String tableName;

    public void print(){
        System.out.println(tableName);
    }
}

Answer

They exist in different packages; With AppConfig living in a config folder and DAOMethods in client->dynamodb->util folder. Config and Client are folders under the main->java folder

The added @Configuration annotation scans for the beans in the current and its subpackages. You need to explicitly tell the application to scan the required packages. So you can do:

@SpringBootApplication (scanBasePackages = {"config", "client"})

OR,

You need to keep the config and other classes which uses that config in same root package. You can put the config folder and client folder under same package, say com.application and then add the following in your main class:

@SpringBootApplication(scanBasePackages = "com.application")

Now run the application.