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Spring boot cannot resolve view page

I am trying to run a simple web application with using Spring Boot but there is a problem with resolving view. When I go to http://localhost:8080/ it shows;
There was an unexpected error (type=Not Found, status=404).
Is there any missing property or library? Why it cannot resolve my html page?
My application.properties;
spring.mvc.view.prefix: WEB-INF/html/
spring.mvc.view.suffix: .html
#SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
#Controller
public class InfoController {
#RequestMapping("/")
public String getServerInfo(Map<String, Object> model){
//This method works without any problem.
model.put("message", "server info");
return "info";
}
}

If you use spring boot with some template engine, for example, thymeleaf. You don't need to set spring.mvc.view.prefix or spring.mvc.view.suffix by default.
You just need to put your template files under the directory src/main/resources/templates/:
And your controller will be something like:
#GetMapping("/temp")
public String temp(Model model) {
model.addAttribute("attr", "attr");
return "index";
}
If you are NOT using any template engine and just want to serve HTML page as static content, put your HTML files under the directory src/main/resources/static/:
And your controller will become:
#GetMapping("/test")
public String test() {
return "test.html";
}

if you are using thymeleaf for spring boot. just add below to pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

Try create tree of files like in here.
src/main/resources/static
or
src/main/resources/templates/ //here put html files

putting in here worked for me in a spring-boot web sample:
src/main/webapp/index.xhtml
then in the browser enter:
http://localhost:8080/index.html
here is a linkt to the sample:
https://www.logicbig.com/tutorials/spring-framework/spring-boot/boot-primefaces-integration.html

Spring Boot with context path excluding statics

I am using Spring Boot as an API and Angular as the frontend for my Application. I build with Maven and so configured the frontend-maven-plugin so it copies all the Angular dist folder into the final jar when building.
What I would like to have is all of my controllers' mapping to have a prefix like '/api' so it becomes '/api/users', but also that my static resources mappings stay what they are, like only '/sign-up' instead of '/api/sign-up'.
So I searched for the server.context-path and server.servlet-path properties but none of them worked. Anyone can help me please ?

#Configuration
public class WebMvcConfiguration implements WebMvcConfigurer {
#Override
public void configurePathMatch(PathMatchConfigurer configurer) {
configurer.addPathPrefix("/api",
HandlerTypePredicate.forAnnotation(RestController.class)
.and(HandlerTypePredicate.forBasePackage("com.company.api")));
}
}

Cannot display the index.html page in Spring boot

I tried to create a simple spring boot application
I created spring boot application class, configuration class, controller class and the index.html.
I added Thymeleaf dependencies and put html page under resources folder (\src\main\resources\templates\index.html)
But when I run the application it gives an error
org.thymeleaf.exceptions.TemplateInputException:
Error resolving template "index.html", template might not exist or might not be accessible by any of the configured Template Resolvers
Please give me a solution.
#SpringBootApplication
#ComponentScan(basePackages = {"com.mail"})
public class SpringBootWebApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootWebApplication.class, args);
}
}
Controller class
#RestController
public class IndexController {
#RequestMapping(value="/", method = RequestMethod.GET)
String index(){
System.out.println("..............hit");
return "index";
}
WebConfiguration for Thymeleaf
#Configuration
public class WebConfiguration extends WebMvcConfigurerAdapter{
#Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("index.html");
registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
}
}
index.html page
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head lang="en">
<title>Spring Framework</title>
</head>
<body>
<h1> Hello Spring Boot </h1>
</body>
</html>

Try to do the following:
Replace #RestController by #Controller;
I think you don't need WebConfiguration; the controller returns “index” which means “render the index.html template”. Thymeleaf will find the template in the resources/templates folder.

Try replacing #RestController with #Controller. I would start from the template generated by start.spring.io. And incrementally add functionalities one step at a time.
Or
If you just do some googling, you will be easily able to find some sample thymeleaf projects that actually works, start from there.

Looks like static resources are not accessible by default. Try to provide access to static resources adding resource handler, something like:
#Configuration
public class StaticResourceConfiguration extends WebMvcConfigurerAdapter {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/**").addResourceLocations("");
}
}

As described by previous answers, #RestController should be replaced with #Controller.
When we use #RestController, return statement value will be sent as String Response. But when we use #Controller the return statement value will be considered as the view to be rendered.
Refer Diff. b/w #RestController and #Controller
Also, Spring Boot will automatically look for index.html in '\src\main\resources\templates\' which is the default location for views in Spring Boot when we are using Template Engines like Thymeleaf. Refer Spring Boot and Template Engines.
Hence we do not need to explicitly define WebConfiguration class because then we're required to define view-resolvers that are configured in the XML file or in Java class using ViewRegistry. Spring Boot eliminates the need for both this XML and Java View Registry. So you can also do away with WebConfiguration class.

Read point number 2 here.
Add the following dependency in your pom:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>

Spring MVC - accessing a static page through Thymeleaf

I have a Spring Boot web application, using embedded Tomcat + Thymeleaf template engine, and package as an executable JAR file.
Technologies used :
Spring Boot 1.4.2.RELEASE,
Spring 4.3.4.RELEASE,
Thymeleaf 2.1.5.RELEASE,
Tomcat Embed 8.5.6,
Maven 3,
Java 8
I want to access an static file located in ../src/main/resources/templates/mockups/index.html
so I created this controller:
#Controller
public class MockupIndexController {
#RequestMapping("/mockup/index")
public String welcome(Map<String, Object> model) {
return "/mockups/index.html";
}
}
but I got this error:
org.thymeleaf.exceptions.TemplateInputException: Error resolving template "/mockups/index.html", template might not exist or might not be accessible by any of the configured Template Resolvers

In spring xml configuration file, map your static files location, please keep static files in different folder
<mvc:resources mapping = "/mockups/**" location = "/src/main/resources/templates/mockups/" />
Changes this line
return "/mockups/index.html";
to
return "redirect:/mockups/index.html";
If you are not using config file then add this class
#Component
class WebConfigurer extends WebMvcConfigurerAdapter {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/mockups/**").addResourceLocations("/src/main/resources/templates/mockups/");
}
}

what is that I'm missing to run jersey 2 web service?

I created a dynamic java project and added this dependency:
<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.containers/jersey-container-servlet-core -->
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<version>2.23.1</version>
</dependency>
Then i created the App class like this:
#ApplicationPath("/test")
public class App extends ResourceConfig {
public App() {
this.packages("com.test.ul");
}
}
and in the same package as the App class is in, i created this:
#Path("restaurantAPI")
public class RestaurantAPI {
#Path("/get")
#GET
public Response getRequest(#PathParam("id") String id) {
return Response.ok(id).build();
}
}
I run my server, and I call this URL:
http://localhost:8080/ULTestServer/test/restaurantAPI/get?id=3
but I get error 404
What Am I missing please ? (I always do that and it used to work)

Change
jersey-container-servlet-core
to
jersey-container-servlet
The reason is that the latter has the required component1 that allows for discovering your application without web.xml, in replace for #ApplicationPath. This is part of the servlet 3 pluggability mechanism.
The first dependency is use for non servlet 3.0 containers, where the use would have to use a web.xml to register the Jersey servlet.
1 - Here is the implementation