Rest Controller not recognizing GET request in Spring Boot App

This what happens behind.

@SpringBootApplication annotation is a combination of @Configuration @EnableAutoConfiguration @ComponentScan.

@ComponentScan without arguments tells the framework to find components/beans in the same package and its sub-packages.

Your Application class which is annotated with @SpringBootApplication is in the package com.nomad.dubbed.app. So it scans that package and its sub-packages under it (like com.nomad.dubbed.app.*). But your CircleController is inside package com.nomad.dubbed.controller which is not scanned by default. Your repositories too fall outside the default scan packages, so they too will not be discovered by spring framework.

So what to do now?, you have two options.

Option 1

Move the Application class to the top directory(package). In your case com.nomad.dubbed package. Then, since all controllers and other repositories are in sub-packages, they will be discovered by the framework.

Option 2

Use @ComponentScan annotation with basePackages argument, along with the @SpringBootApplication in your Application class like below.

@SpringBootApplication
@ComponentScan(basePackages="com.nomad.dubbed")
public class Application  {

    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }
}

use a different url for your controller. "/" in spring-boot maps to static resources located in META-INF/resources and src/main/resources/static/ .

edit: forget above and do the following in your application class:

Application.java

package com.nomad.dubbed.app;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@ComponentScan("com.nomad.dubbed")
public class Application  {

    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }

}

your rest controller is not discovered by spring-boots component scan. according to this doc http://docs.spring.io/spring-boot/docs/current/reference/html/… spring scans the packages below the package where the class with the @SpringBootApplication annotation resides. your controller is located in a parallel package.

We should not use @ComponentScan annotation with @SpringBootApplication, as that's not the right practice. @SpringBootApplication is a combination of 3 annotations: @ComponentScan, @EnableAutoConfiguration and @Configuration.

Main class which has the @SpringBootApplication annotation should be in parent/super package.

e.g. - com.spring.learning is a parent package and its children are com.spring.learning.controller, com.spring.learning.service, com.spring.learning.pojo

Hence it scans its package and sub packages.

This is the best practice – project layout or structure is a prominent concept in Spring Boot.