com.test__
          |
          |
          |controller__
          |            |
          |            |
          |            |UserController.java
          |
          |domain______
          |            |
          |            |
          |            |User.java
          |
          |
          |repository___
          |            |
          |            |
          |            |UserRepository.java
          |
          |service______
          |            |
          |            |
          |            |UserService.java
          |
          |ServletInitializer.java
          |TestApplication.java
__________|

package com.test.controller;

import com.test.domain.User;
import com.test.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@CrossOrigin
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping
    public List<User> getAllUsers(){
        return userService.findAll();
    }

    @PostMapping
    public void deleteUser(Long id){
        userService.delete(id);
    }

    @PutMapping
    public User signUpUser(User user){
        return userService.save(user);
    }
    @PostMapping("/find")
    public User findUserById(Long id){
        return userService.findOne(id);
    }

}

package com.test.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String firstName;

    private String lastName;

    public User() {
    }

    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", firstName='" + firstName + ''' +
                ", lastName='" + lastName + ''' +
                '}';
    }
}

package com.test.repository;

import com.test.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User,Long> {
}

package com.test.service;

import com.test.domain.User;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

public interface UserService {

    List<User> findAll();

    User findOne(Long id);

    User save(User user);

    void delete(Long id);


}

package com.test.service.impl;

import com.test.domain.User;
import com.test.repository.UserRepository;
import com.test.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public List<User> findAll() {
        return userRepository.findAll();
    }

    @Override
    public User findOne(Long id) {
        return userRepository.findOne(id);
    }

    @Override
    public User save(User user) {
        return userRepository.save(user);
    }

    @Override
    public void delete(Long id) {
        userRepository.delete(id);
    }
}

package com.test;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(TestApplication.class);
    }

}

package com.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class TestApplication {

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

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.hikari.connection-timeout=60000
spring.datasource.hikari.maximum-pool-size=5
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect
spring.jpa.show-sql=true

<groupId>com</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>test</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.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-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</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-tomcat</artifactId>
            <scope>provided</scope>
        </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>

<html>

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>

<body>

    <ul id="list">


    </ul>

    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
</body>

<script>
    $.ajax({
        "url": "http://localhost:8080/user",
        'method': 'GET',
        'contentType': 'application/json',
        'dataType': 'json',
        'headers': {
            'Content-Type': 'application/json;charset=utf-8'
        },
        'success': function(data) {
            for(var i = 0;i<data.length;i++){
                $('#list').append("<li>" + "<b>Name:</b>" + data[i].firstName + "<br>" + "<b>Last name:</b> " + data[i].lastName + "</li>");
            }
        },
        'error': function(error) {
            console.log(error);
        }
    });

</script>

</html>

/____
     |
     |.cashe
     |
     |.softaculous
     |
     |public_html
     |
     |webapps____
     |           |
     |           |ROOT
     |           |
     |           |docs
     |           |
     |           |examples
     |           |
     |           |host-manager
     |           |
     |           |manager
     |           |
     |___________|
     |
_____|www