No qualifying bean of type,expected at least 1 bean which qualifies as autowire, org.springframework.beans.factory.UnsatisfiedDependencyException: - spring-boot

Question

I Created a simple Springboot Application with H2 DB. Not able to start the spring boot Application getting below error on startup. I have added all the necessary configurations.
Exception encountered during context initialization - cancelling
refresh attempt:
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'studentController': Unsatisfied
dependency expressed through field 'studentService'; nested exception
is org.springframework.beans.factory.NoSuchBeanDefinitionException: No
qualifying bean of type
'com.example.test.serviceimpl.StudentServiceImpl' available: expected
at least 1 bean which qualifies as autowire candidate. Dependency
annotations:
{#org.springframework.beans.factory.annotation.Autowired(required=true)}
Controller:
package com.example.test.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import com.example.test.serviceimpl.StudentServiceImpl;
import comm.example.test.model.Student;
#RestController
public class StudentController {
#Autowired(required=true)
private StudentServiceImpl studentService;
#GetMapping("/student")
private List<Student> getAllStudent() {
return studentService.getAllStudent();
}
#GetMapping("/student/{id}")
private Student getStudent(#PathVariable("id") Long id) {
return studentService.getStudentById(id);
}
}
Student Pojo class
package comm.example.test.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
#Getter
#Setter
#AllArgsConstructor
#Entity
#Table(name="student")
public class Student {
#Id
#Column
private Long id;
#Column
private String name;
#Column
private int age;
#Column
private String email;
}
StudentService Interface:
package com.example.test.service;
import java.util.List;
import comm.example.test.model.Student;
public interface StudentService {
List<Student> getAllStudent();
Student getStudentById(Long id);
}
StudentServiceImpl:
package com.example.test.serviceimpl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import com.example.test.repository.serviceimpl.StudentRepositoryServiceImpl;
import com.example.test.service.StudentService;
import comm.example.test.model.Student;
public class StudentServiceImpl implements StudentService {
#Autowired
private StudentRepositoryServiceImpl serviceImpl;
#Override
public List<Student> getAllStudent() {
return serviceImpl.getAllStudent();
}
#Override
public Student getStudentById(Long id) {
return serviceImpl.getStudentById(id);
}
}
RepositoryService:
package com.example.test.repository.serviceimpl;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.example.test.repository.StudentRepository;
import comm.example.test.model.Student;
#Service
public class StudentRepositoryServiceImpl {
#Autowired
private StudentRepository repo;
public List<Student> getAllStudent() {
List<Student> students = new ArrayList<Student>();
repo.findAll().forEach(student -> students.add(student));
return students;
}
public Student getStudentById(Long id) {
return repo.findById(id).get();
}
}
Repository:
package com.example.test.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import comm.example.test.model.Student;
#Repository
public interface StudentRepository extends JpaRepository<Student, Long> {
}

Answer 1

Your StudentServiceImpl needs a #Service annotation to be injected.