I'm setting a spring boot project with thymeleaf but my view isn't displaying and getting the following error in the browser.
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri May 24 00:44:22 GST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Controller:
#Controller
public class MainController {
#GetMapping("/")
public String homePage() {
return "home";
}
}
application.properties:
spring.thymeleaf.cache=false
spring.thymeleaf.enabled=true
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.application.name=Bootstrap Spring Boot
I had added thymeleaf feature in my html file, but when it wasn't working I just made it simple html file. My home.html is:
<html>
<head>
<title>Home Page</title>
</head>
<body>
<h1>Hello !</h1>
<p>
Welcome to Our App</span>
</p>
</body>
</html>
It's a very simple and basic controller. I am not seeing any exception stack trace in the console.
When you see this error , there are many possible reasons so try the following :
Make sure that you folder structure is correct. When the maven folder structure is not followed , spring might have difficulties discovering endpoints etc.
Make sure that you keep your main application.java a root package above other classes since spring boot annotation only scan the classes below your main class package.
For example :
com
+- APP
+- MainApplication.java <--- your main class should be here, above your other classes
|
+- model
| +- model.java
+- controller
+- Controller.java
Make sure that your resources are placed in the correct directory.
By default, Spring Boot serves static content from a directory called
/static (or /public or /resources or /META-INF/resources) in the
classpath or from the root of the ServletContext.
When you use one of these templating engines with the default
configuration, your templates are picked up automatically from
src/main/resources/templates.
Official doc : https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-developing-web-applications.html
Since, you have provided the thymeleaf configuration in the application.yml, you can put your thymeleaf templates in the /templates folder of your resources folder and spring should take it up.
After a couple of days of effort, I resolved this issue by downgrading spring boot version from 2.1.5 to
<version>2.0.6.RELEASE</version>
l have a similar problem .l resolved it by renaming the home.html page to index.html and spring seems to resolve it automatically.Works like magic
Related
Using a fresh Spring Initialzr with Java17 and Spring Boot 3.0.0, and an extra addition to the pom.xml for Springfox Swagger 3, I can't for the life of me get Swagger pages to work. Instead, I get the whitelabel error page with 404.
Pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-boot-starter</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
The standard Swagger URLs as defined in this Github Issues page aren't working for the above pom.xml project.
I had given up and went to use Spring Boot 2.7 after posting the question. But, after seeing Dmitriy's answer though, I checked Springdoc one last time and found that Springdoc v2 does support Spring Boot 3.
Essentially, one has to place the following in their pom:
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.0</version>
</dependency>
Then one can access the Swagger page using the following URL: http://localhost:8080/swagger-ui.html (Don't forget to add context path if you need it). For some reason, when opening, it redirects to http://localhost:8080/swagger-ui/index.html although going for that initially returned 404...
in addition to adding springdoc-openapi-starter-webmvc-ui (v2.0.2 for me) as indicated in the accepted answer, I also needed to remove org.springdoc:springdoc-openapi-ui:1.6.13 .
It was there because I had tried it before. If present, there's still a non Jakarta reference that Spring tries to resolve (and fails to do so).
I also needed to add this dependency, otherwise I would have a nasty message at startup (version is resolved by Spring Boot BOM) :
implementation group: 'org.hibernate.validator', name: 'hibernate-validator'
Lastest
springfox-boot-starter version 3.0.0
and
springdoc-openapi-ui 1.6.13
seems not to support spring-boot 3.
We need to wait until the new version adopts jakarta.servlet package
Springdoc is working with Spring boot 3.0.1
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.2</version>
</dependency>
Default URL: http://localhost:8080/swagger-ui/index.html
For Gradle you can add this:
implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.0.0'
I agreed with #Ahmed Tawfik because I also faced the same. But today I tried that same approach with the new version of "springdoc-openapi-starter-webmvc-ui" dependency and Spring Boot 3.0.2-SNAPSHOT.
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.2</version>
</dependency>
because the previous one "springdoc-openapi-ui" is changed to the above one.
Also, include below the path to the security config for swagger UI.
"/v3/api-docs/**","/swagger-ui/**"
For my project,
#Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
return http.cors(AbstractHttpConfigurer::disable)
.csrf(AbstractHttpConfigurer::disable)
.exceptionHandling(exceptionHandlingConfigurer -> exceptionHandlingConfigurer.authenticationEntryPoint(unauthorizedHandler))
.authorizeHttpRequests(authorizationManagerRequestMatcherRegistry -> {
try {
authorizationManagerRequestMatcherRegistry
.requestMatchers(HttpMethod.POST, POST_AUTH_WHITELIST).permitAll()
.requestMatchers(HttpMethod.GET, GET_AUTH_WHITELIST).permitAll()
.requestMatchers("/v3/api-docs/**", "/swagger-ui/**").permitAll()
.anyRequest()
.authenticated()
.and()
.sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS));
} catch (Exception e) {
throw new ResourceNotFoundException(e.getMessage());
}
}
)
.formLogin(AbstractHttpConfigurer::disable)
.httpBasic(AbstractHttpConfigurer::disable).addFilterBefore(jwtAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class)
.authenticationProvider(daoAuthenticationProvider()).build();
}
The swagger UI link will be:
http://server:port/context-path/swagger-ui.html
Please adjust the server, port, and context-path regarding your personal changes.
All the above steps are working fine with my project. I don't need extra configuration.
Also, you can add the custom path (Optional):
springdoc.swagger-ui.path=/swagger-ui.html
Here is the Official Documentation of OpenApi 3 and Spring Boot : https://springdoc.org/v2/#features
In the above documentation, you can explore additional configurations and other things also.
Happy Learning! ✌️
Use Open API instead swagger for Spring v3.0. Follow this document Open API Docs
Following dependencies working fine to me.
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sample.app</groupId>
<artifactId>hello-world</artifactId>
<version>1.0.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.1</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.0</version>
</dependency>
</dependencies>
</project>
I'm pretty new at Spring framework, and I try to start a project for practice.
But I have an error and I have no idea how to fix this.
I've created a new Spring project in IntelliJ Idea, with Spring Initializr option (In Intellij, not with start.spring.io ). I added only 2 dependedncies for start (Web and Thymeleaf), but it throws error for Thymeleaf dependency if i run it with
'mvn spring-boot:run' command.
My spring project is "empty" , I have no controllers, beans, jpa entites, etc.. but it i think it shound run in this way too. I just wanted to make sure if it works if I run it.
If I create a same project, without Thymeleaf dependency (only Web dependency), it starts correctly on localhost.
I'm using Java 9.0.4 and Apache Maven 3.5.3
My error log
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo_thymeleaf</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo_thymeleaf</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>9</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
I solved it with deleting the whole C\Users\user.m2 directory.
After then with 'mvn spring-boot:run' it started successfully on localhost.
But I've got one more question:
When I run it, at terminal there are a couple of Warning messages.
Spring application runs anyway, but is there something to do with these messages?
Warning messages during Spring application run.
I am exploring how JSPs can be served from JAR file. I'm using SpringBoot 1.5.10.RELEASE
I referred this & this examples and was able to create spring boot app which
includes JSPs at location src/main/resources/META-INF/resources/WEB-INF/jsp/
view resolver has prefix as /WEB-INF/jsp/ and suffix as .jsp
Strange thing is when I ran project as springboot app or Java App, I was able to hit the controller and got desired JSP file as response. After that I thought of packaging the app and then running it from JAR.
$ mvn package
$ java -jar target/springboot-web-jar-demo-0.0.1-SNAPSHOT.jar
Spring boot app comes up, when I hit the same URL pattern, control comes in the mapped method but after that...
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Wed Feb 28 21:01:09 IST 2018
There was an unexpected error (type=Not Found, status=404).
/WEB-INF/jsp/index.jsp
My problem/question...
Is there any major difference between the springboot app runs in IDE and when it runs as JARs, which can even cause 404?
Does spring boot 1.5.10.RELEASE support serving JSPs from JAR? (if yes then what I'm missing here, if no then where it is mentioned) - stackoverflow-link
I have tried searching proper solution or answer to my problem but didn't get any. Hence posting the question here please help.
Note:
Please don't provide solution for WAR packaging
I know JSP are not best choice nowadays, I'm just learning
I'm aware that I can look for alternatives like thymeleaf, freemarker and velocity
I don't want to downgrade the SpringBoot version
I've also tried specifying <scope> of jasper & JSTL to provided and compile but no luck
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.atuldwivedi.learn.springboot</groupId>
<artifactId>springboot-web-jar-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot-web-jar-demo</name>
<description>Learn how to serve JSP from JAR</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
<relativePath />
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
For you spring boot recognize their jsps, you debt create a webapp directory in src.main like this:
src/main/webapp/WEB-INF/jsp
and not like:
src/main/resources/META-INF/resources/WEB-INF/jsp
for dispatcherServelet recognize their jsps, you create a webapp directory in src.main like this:
src/main/webapp/WEB-INF/jsp
and also autoconfigure your application in application.properties
spring.mvc.view.prefix:/WEB-INF/jsp
spring.mvc.view.suffix:.jsp`
JSPs are not supported when using an executable jar.
I am learning Spring Boot. I have just created my first project using maven, Spring Boot, Spring Rest support and MongoDB. It compiles successfully, but it resolves all the dependencies, but do not compile the java classes at all.
After compilation, jar file is correctly created, it contain lib folder, metadata etc, but it do not contain project class file at all.
Hence when i run the project with mvn spring-boot:run, it throws an exception that class not found (Main method class for Spring boot initialization).
Please suggest, what I am doing wrong here, here is my maven configuration class:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<properties>
<java.version>1.6</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<start-class>com.assignment.BootInitializer</start-class>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.9.RELEASE</version>
</parent>
<groupId>com.assignment</groupId>
<artifactId>spring-assignment</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And here is the main initializer class:
package com.assignment;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
#Configuration
#EnableAutoConfiguration
#ComponentScan
public class BootInitializer {
public static void main(String[] args) {
SpringApplication.run(BootInitializer.class, args);
}
}
What I need to do, to ensure that maven is compiling the java classes and including them in the jar file.
Thanks.
I am learning Spring Boot.
Okay, good. Let's do one step at a time. Go to start.spring.io and generate a template project with whatever dependencies you want and whatever build tool (maven / gradle) you like. Build it and run it and see whether it is coming up or not. Then incrementally build on top of it.
I've been learning Spring using the following tutorials: https://www.youtube.com/playlist?list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x
I have created a Maven project and tried to run the Spring Boot application while referring to these videos:
https://www.youtube.com/watch?v=E7_a-kB46LU&index=9&list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x
I tried to run my Spring application on Tomcat server but the localhost isn't working. (Port 8080)
My pom.xml looks like this:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.javabrains.springbootquickstart</groupId>
<artifactId>course-api-new</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Java Brains Course API</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
</project>
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) {
SpringApplication.run(CourseApiApp.class, args);
}
}
According to the video localhost should display Whitelist error on running the application, but it doesn't run at all.
Any help would be appreciated, thanks!
I would suggest that you start your project from beginning. To create a valid spring-boot project you have a very good web based generator for spring-boot starter applications.
https://start.spring.io/
For a web application with an embedded tomcat you should use web project.
Using STS you can create the same by choosing new -> spring starter project.
A wizard will appear and you can choose your project informations:
And then in the second step you dependencies:
After generating your project your pom.xml should look like that:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Your application should start normally and tomcat listens on localhost:8080.
EDIT
The starter just have a new design:
Solution: add web starter dependency to pom.xml for maven
No need to create new app. Just change this starter dependency to starter-web dependency:
Starter
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
Starter Web
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
You should try to run spring-boot as sudo
sudo mvn spring-boot:run
It could be possible that STS by default uses Tomcat version 7 and if you happen to use version 8, then would need to specify the same in pom.xml
<properties>
<tomcat.version>8.0.47</tomcat.version>
</properties>
I also faced the same issue. Try creating Spring Boot apprlication by choosing Spring Boot starter project in STS.
Right click on STS->New->Spring Starter Project->Give name and click on Next->Choose Web and tick mark on Web and search for Dev Tools and tick mark Dev Tools and click on Finish
Now click on the project and Run as Spring Boot Application.
In application.properties put server.port=8080
I faced the similar issue. I too was following the JavaBrains SpringBoot example. This is what I did:
I created a fresh spring boot project using STS tool and included the same code as provided by you and it worked!
You need to tell springboot where do you have to scan your reference classes
#SpringBootApplication
#ComponentScan(basePackages= {"com.testbean.controller", "com.testbean.model", "com.testbean.service"})
public class DemoApplication {
Use #ComponentScan("io.javabrains") and mention the package in which the Controller is present. eg.
#SpringBootApplication
#ComponentScan("io.javabrains")
public class CourseApiApp {
public static void main(String[] args) {
SpringApplication.run(CourseApiApp.class, args);
}
}
In a spring boot application, by default spring searches for components in the same package which is having the #SpringBootApplication annotation.
Follow this tutorial to setup JavaJDK, Tomcat and Maven: https://jeromejaglale.com/doc/spring4_tutorial/installation_macos
Next step move to Terminal app: type cd root_project and run sudo mvn spring-boot:run
I managed to solve with a tip above the server.port
I added as said: server.port = 8090 and it worked.
https://drive.google.com/file/d/1lZAEaD5VZdpnyffROn9X37mZm4vaQJ9G/view?usp=sharing