Spring @RestController not working

[Mike London]

Hello,

I am using the sample from spring.io to get the basic "Hello World!" SpringBoot application running.

Hurray...that part works.

But, when I try to add another @RestController, like the code below, and then try to visit that URL, as in "localhost:8080/test", I get the dreaded 404 error.

So the problem is that I can't seem to figure out how to simply configure a new REST controller to run at some URL. I'm assuming with the @EnableAutoConfiguration, I don't need to manually wire things in, but something is wrong.

Thanks in advance.

- mike

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
public class TestController
{
    @RequestMapping("/test")
    public String getTest()
    {
        return "Test!";
    }
}

[priyanshi bhardwaj]

can you share some more details for me to help you out.Like what is in there your front end etc .

[Stephan van Hulst]

Can you show us your Application class, and tell us how you're starting your application?

[Mike London]

Stephan van Hulst wrote:Can you show us your Application class, and tell us how you're starting your application?

From the spring.io site, here's my Application class:

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
public class Example
{
    @RequestMapping("/")
    String home()
    {
        return "Hello World!";
    }

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

}

To run the application, I just click the ">" in the IntellJ toolbar.

Running (in Firefox): "localhost:8080" gives me the expected "Hello World!"

But, I don't seem to be able to wire in more controllers.

My goal is to have multiple methods (different controllers) that can be externally called as an API.

Thanks in advance,

- mike

[Stephan van Hulst]

Why aren't your classes in a package?

[Mike London]

Stephan van Hulst wrote:Why aren't your classes in a package?

I was just trying to get the basic code to work and would refactor into packages later (post "Hello World" level).

Any suggestions on the actual problem I posted?

Thanks,

-- mike

[Ron McLeod]

Mike London wrote:

Stephan van Hulst wrote:Why aren't your classes in a package?

I was just trying to get the basic code to work and would refactor into packages later (post "Hello World" level).

Any suggestions on the actual problem I posted?

Thanks,

-- mike

Maybe that is (part of) the actual problem ...

https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-structuring-your-code.html wrote:When a class doesn’t include a package declaration it is considered to be in the “default package”. The use of the “default package” is generally discouraged, and should be avoided. It can cause particular problems for Spring Boot applications that use @ComponentScan, @EntityScan or @SpringBootApplication annotations, since every class from every jar, will be read.

[Mike London]

Ron McLeod wrote:

Mike London wrote:

Stephan van Hulst wrote:Why aren't your classes in a package?

I was just trying to get the basic code to work and would refactor into packages later (post "Hello World" level).

Any suggestions on the actual problem I posted?

Thanks,

-- mike

Maybe that is (part of) the actual problem ...

https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-structuring-your-code.html wrote:When a class doesn’t include a package declaration it is considered to be in the “default package”. The use of the “default package” is generally discouraged, and should be avoided. It can cause particular problems for Spring Boot applications that use @ComponentScan, @EntityScan or @SpringBootApplication annotations, since every class from every jar, will be read.

Gotcha. It turns out you had the answer there. Creating the package wasn't enough (though it may have been sufficient to cause the problem).

Turns out, I did not have @ComponentScan in the main App class.

Added that and everything (my two "hello" masterpiece methods) works!

Thanks so much.

- mike

@ComponentScan
@RestController
@EnableAutoConfiguration
public class Example
{
    @RequestMapping("/")
    String home()
    {
        return "Hello World!";
    }

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

}