I made this simple application to connect to the MySQL database and I'm getting this error:
org.springframework.jdbc.core.JdbcTemplate
In my configuration (com.kubamadry.dao.MySqlStudentDao)
:
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APPLICATION FAILED TO START
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Description:
Field jdbcTemplate in com.kubamadry.dao.MySqlStudentDao required a bean of type 'org.springframework.jdbc.core.JdbcTemplate' that could not be found.
Action:
Consider defining a bean of type 'org.springframework.jdbc.core.JdbcTemplate' in your configuration.
Disconnected from the target VM, address: '127.0.0.1:49838', transport: 'socket'
Process finished with exit code 1
The project structure:
Classes
Main
package com.kubamadry;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Main {
public static void main(String args[]) {
SpringApplication.run(Main.class, args);
}
}
Student
package com.kubamadry.entity;
public class Student {
private int id;
private String name;
private String course;
}
//Constructor, getters and setters
StudentController
package com.kubamadry.controller;
import com.kubamadry.entity.Student;
import com.kubamadry.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import java.util.Collection;
@RestController
@RequestMapping("/students")
public class StudentController {
@Autowired
private StudentService studentService;
@RequestMapping(method = RequestMethod.GET)
public Collection<Student> getAllStudents() {
return studentService.getAllStudents();
}
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public Student getStudentById(@PathVariable int id) {
return studentService.getStudentById(id);
}
@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
public void deleteStudentById(@PathVariable int id) {
studentService.deleteStudentById(id);
}
@RequestMapping(method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
public void updateStudent(@RequestBody Student student) {
studentService.updateStudent(student);
}
@RequestMapping(method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
public void addStudent(@RequestBody Student student) {
studentService.addStudent(student);
}
}
MySqlStudentDao
package com.kubamadry.dao;
import com.kubamadry.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;
import org.springframework.jdbc.core.JdbcTemplate;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
@Repository("mysql")
public class MySqlStudentDao implements StudentDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public Collection<Student> getAllStudents() {
final String sql = "SELECT * FROM students";
List<Student> students = jdbcTemplate.query(sql, new RowMapper<Student>() {
@Override
public Student mapRow(ResultSet resultSet, int i) throws SQLException {
Student student = new Student();
student.setId(resultSet.getInt("id"));
student.setName(resultSet.getString("name"));
student.setCourse(resultSet.getString("course"));
return student;
}
});
return students;
}
@Override
public Student getStudentById(int id) {
return null;
}
@Override
public void deleteStudentById(int id) {
//
}
@Override
public void updateStudent(Student student) {
//
}
@Override
public void addStudent(Student student) {
//
}
}
application.properties
spring.datasource.url=jdbc:mysql://localhost/students
spring.datasource.username=root
spring.datasource.password=password123
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.kubamadry</groupId>
<artifactId>workingProject</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Please help me with this problem.
You need to declare JdbcTemplate
bean in any @Configuration
class, for example:
@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
Also, consider using spring-boot-starter-jdbc
instead of spring-jdbc
dependency. Starter module contains most of the libraries you'll need in the future.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>