HTTP Status 404 – Not Found Spring Boot - spring

Question

I am creating simple crud system using spring boot. When I load the page it is working currectly. when I add a new link it display as HTTP Status 404 – Not Found Spring Boot I don't why everything I made currect way I attached screenshot with code below.
Error Screen
EmployeeController
#Autowired
private EmployeeService service;
#RequestMapping("/")
public String viewHomePage(Model model) {
List<Employee> listemployee = service.listAll();
model.addAttribute("listemployee", listemployee);
return "index";
}
#RequestMapping(value = "/new")
public String add(Model model) {
model.addAttribute("employee", new Employee());
return "new";
}
index.html
<table class="table">
<tbody>
<tr>
<td>
<a th:href="#{'/new'}">Add new</a>
</td>
</tr>
<tr th:each="employee : ${listemployee}">
<td th:text="${employee.id}">Employee ID</td>
<td th:text="${employee.firstName}">FirstName</td>
<td th:text="${employee.lastName}">LastName</td>
<td>
<a th:href="#{'/edit/' + ${employee.id}}">Edit</a>
<a th:href="#{'/delete/' + ${employee.id}}">Delete</a>
</td>
</tr>
</tbody>
</table>
folder structure
porm.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<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>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
application.properties
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/lindaschool?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
server.error.whitelabel.enabled=false
server.port=7020
spring.datasource.username=root
spring.datasource.password=
#logging.level.root=WARN
spring.jpa.open-in-view=false
spring.thymeleaf.cache=false

Answer 1

The problem is package structure, you not following the standard package structure of spring boot and spring framework. By default spring boot application will only scans the classes annotated with any stereotype from main class and it's sub packages. I would recommend to move all dependency classes under sub packages of main class
com.example.crudbank
|
-------------------->CrudBankApplication.java
com.example.crudbank.service
|
--------------------->StudentService
com.example.crudbank.controller
|
----------------------> StudentController.java
com.example.crudbank.repository
|
-----------------------> StudentRepository.java
com.example.crudbank.domain
|
------------------------>StudentDomain.java