how to serve static content in springboot 2.2.6?

I am newbie to Springboot and I am trying to display html page on its root(localhost:8080) path. To do so I googled and gone through -

Tried almost everything but none of them worked for me.

Exact problem

With out index.html file inside any of resources/(static/ or public/ or meta-inf/resources) works fine and show the list of some spring data rest. If I create an index.html file then it gives an error of 404 not found with out @EnableWebMvc annotation, if use @EnableWebMvc then it shows the list of Spring data rest apis.

Other than index.html file it show the list of Spring data api in root path, and url(localhost:8080/test.html) to other than index.html has same problem.

This problem has no effects by implementing public class StaticResourceConfiguration implements WebMvcConfigurer with this configuration to.

Solution

Starting with a simple spring boot initializer

... we can place static (html) files into one of:

(src/main/resources:)
static
resources
public
META-INF
- resources

which results in the default (class path) locations, configured via the spring.resources.static-locations property.

These will be exposed through the value of spring.mvc.static-path-pattern-property (ref), by default: /**.

So a static index.html file in one of the above mentioned folders, with default config, will be accessible at:

http:localhost:8080/ (due to "welcome file mapping" -> static mapping)
and http://localhost:8080/index.html (due to the static mapping)

Accordingly: no problem with http://localhost:8080/test.html ...

Checkout at github.

So this, at least answers the "question title" "how to serve static content in springboot 2.2.6?".

The order of spring.resources.static-locations appears (index.html preferred from META-INF/resources) also to be the "precedence" of static file locations (left-to-right, first match wins).

When we add `@EnableWebMvc`

..."evertyhing gets broken" (context loads, but) only:

WARN ... o.s.web.servlet.PageNotFound             : No mapping for GET /
WARN ... o.s.web.servlet.PageNotFound             : No mapping for GET /index.html
WARN ... o.s.web.servlet.PageNotFound             : No mapping for GET /test.html

..please aslo consider this: why spring-boot application doesn't require @EnableWebMvc

With "non-default config", You would have to provide more details, to find a specific solution.

But for "newbie in Springboot": starting with an intializer and "the defaults" sounds optimal! From here on, you can re-fine your configuration based on a working one.

And if you want/need the @EnableWebMvc annotation for some reason, this will result in the "previous" behavior again/restore the (2.2.6) default static content handling:

@EnableWebMvc
@SpringBootApplication
public class DemoApplication implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry
          .addResourceHandler("/**")
          .addResourceLocations("classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/");

    }

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

}

(Assuming no conflicts with existing configuration/resource handlers)

how to serve static content in springboot 2.2.6?

Starting with a simple spring boot initializer

When we add @EnableWebMvc

When we add `@EnableWebMvc`