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Get NOT_FOUND with Spring Boot?

I'm new to Spring framework.
I try to make a simple web server application with Spring but I got 404 Not Found when I call url with Postman.
package com.leoaslan.doctorfinder;
//..import
#SpringBootApplication
#EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
#ComponentScan({"com.delivery.request"})
#EntityScan("com.delivery.domain")
#EnableJpaRepositories("com.delivery.repository")
public class DoctorfinderApplication {
public static void main(String[] args) {
SpringApplication.run(DoctorfinderApplication.class, args);
}
}
package com.leoaslan.doctorfinder.controller;
//import
#RestController
#RequestMapping("/api")
public class LoginController {
private final Logger log = LoggerFactory.getLogger(LoginController.class);
#Autowired
LoginService loginService;
#GetMapping("/auth/login")
ResponseEntity<?> login(HttpServletRequest request) {
System.out.println("OK");
return new ResponseEntity<>(HttpStatus.ACCEPTED);
}
}
I haven't configured anything yet in application.properties.
Thanks for any helps

Your Controller class is not being scanned, so just try to add the proper package of your controllers on your #ComponentScan
#ComponentScan({"com.delivery.request", "com.leoaslan.doctorfinder.controller"})
Actually, do you really have those packages (com.delivery.request, com.delivery.domain, com.delivery.repository) on your application ? They look suspiciously copy/pasted and they will not do anything unless you change them where your classes really are.

spring application - get RequestMapping

file : CourseApiApp.java
package io.javabrains.springbootstarter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class CourseApiApp {
public static void main(String[] args){
//this is the first step to convert the application into spring app
SpringApplication.run(CourseApiApp.class,args);
}
}
File HelloControllerTwo
package io.javabrains.springbootstarter.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
#RequestMapping("/hello")
public class HelloControllerTwo {
public String sayHi() {
return "Hi";
}
}
I have created a very basic spring app to get hi on /hello path. I but I am still getting a fallback /error message on /hello
Could anyone please let me know what am I doing wrong?

Your #RequestMapping annotation should be on your method, not your class.
You should also specify a method in your annotation.
Try this:
#RestController
public class HelloController {
#RequestMapping(value = "/hello", method = RequestMethod.GET)
public String sayHello() {
return "Hello";
}
}

How to resolve the problem related to "Whitelabel Error Page" in a Spring Boot application

I am trying to execute my new Spring Boot application.
The first two classes are:
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class UbbioneApplication {
public static void main(String[] args) {
SpringApplication.run(UbbioneApplication.class, args);
}
}
then the servlet Initializer class
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
public class ServletInitializer extends SpringBootServletInitializer {
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(UbbioneApplication.class);
}
}
But when I am used to run my application by writing mvn spring-boot:run in the console, I have this message appearing:
Whitelabel Error Page
Could you help me please how to resolve this issue?
Thanks in advance.

I think I have an answer:
I created a controller to my application and I updated my code as following:
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
#Configuration
#EnableAutoConfiguration
#ComponentScan(basePackages = {"Name_controller_path"})
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
Then my controller will look like this:
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class Appcontroller {
#RequestMapping(value = "/home", method = RequestMethod.GET)
String home() {
return "home";
}
}
Then use this path to view your execution: http://localhost:8080/home.

Spring boot not displaying first view

I'm building a spring boot application. My problem is that when I run the project, my login page is not shown. This is my code:
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class RestLogin {
#RequestMapping("/")
public String login() {
return "login";
}
}
I get only a white page and "login" is written in it. When I try to change the #RestController with #Controller I get this GET http://localhost:8080/ 404 (). My login.html page is located under the webapp>tpl>login.html
How can I display my login page?
Edit
This is my application class
#SpringBootApplication
public class ExampleApplication extends SpringBootServletInitializer {
private static Logger logger = LoggerFactory.getLogger(ExampleApplication.class);
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
return builder.sources(ExampleApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(ExampleApplication.class, args);
}
}

I dont know your configuration but:
#Configuration
#EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
#Override
protected void configure(HttpSecurity http) throws Exception {
http.httpBasic().and().authorizeRequests()
.antMatchers("/**").permitAll();
http.authorizeRequests().antMatchers("/**").permitAll();
}
}
In the Application.properties file add:
spring.mvc.view.suffix: .html
Change #RestController to #Controller for RestLogin class. Also put your html file inside the static folder inside resources folder.

You need an application class with a main method. See this tutorial.
Here's a snippet:
package hello;
import java.util.Arrays;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
#SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
#Bean
public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
return args -> {
System.out.println("Let's inspect the beans provided by Spring Boot:");
String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
System.out.println(beanName);
}
};
}
}

This is the normal behavior.
New version of Spring web comes with #RestController annotation which nothing but #Controller + #ResponseBody. So when you have a return statement in a method you must use #RestController or annotate your method with #ResponseBody.
Here the problem is that Spring don't know a lot about the http method type, can you please try to use #GetMapping("/") to combinbe path and method at the same time.

According to your posted code and your description, you're getting an expected behavior.
When you annotate your controller with #RestController, that means that your methods on that controller will try to return their result as JSON.
According to your code:
#RestController
public class RestLogin {
#RequestMapping("/")
public String login() {
return "login";
}
}
You're returning the String "login", that's why you're getting empty white page with the word login as JSON
If you will change the #RestController to #Controller then it no longer will return your string as JSON,
but Spring will try to figure out from the that "login" string a view, and for that you'll need to add a view resolver bean to your project.

Spring Cloud Config and static content

I have a application that uses Spring cloud config (--spring.profiles.active=native) and also serves up some html pages within the same application. All is fine until I introduce static resources (src/main/resources/css/bootstrap-switch.css). The URL calls to http://localhost:8080/css/bootstrap-switch.css fails with this Exception:
{"timestamp":1438114326940,"status":406,"error":"Not Acceptable","exception":"org.springframework.web.HttpMediaTypeNotAcceptableException","message":"Could not find acceptable representation","path":"/css/bootstrap-switch.css"}
When I disable the #EnableConfigServer, the URL returns the CSS content. I am on Spring Cloud Config version 1.0.2.
Here's my minimalist code that can reproduce this issue:
#SpringBootApplication
#EnableConfigServer
public class Application {
public static void main(String args[]) {
SpringApplication.run(ApplicationConfiguration.class, args);
}
}
#Configuration
#SpringBootApplication
class ApplicationConfiguration {
#Bean
public TestController testController() {
return new TestController();
}
#Bean
public MvcController mvcController() {
return new MvcController();
}
}
#RestController
class TestController {
#RequestMapping("/test")
#ResponseBody
public String test() {
return "hello world";
}
}
#Controller
class MvcController {
#RequestMapping("/landing")
public String landingPage() {
return "landing";
}
}

Config server by default has an api that matches /*/*. You can move the root of the api by changing spring.cloud.config.server.prefix=myroot.