I am trying to learn and build a basic Spring Boot application using REST API, Java, and Oracle SQL. I'm stuck with this error. I've tried doing suggestions from internet (clean and install, jpa dependency), but I still could not fix this. I am so frustrated; please help me, I want to learn. Many thanks!
Here's the error message in console log:
Field userRepository in com.example.userApi.controller.UserController required a bean named 'entityManagerFactory' that could not be found.
The injection point has the following annotations:- @org.springframework.beans.factory.annotation.Autowired(required=true)
Action: Consider defining a bean named 'entityManagerFactory' in your configuration.
Here is my code for reference.
UserApiApplication.java
package com.example.userApi;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.domain.EntityScan;import org.springframework.context.annotation.ComponentScan;import org.springframework.data.jpa.repository.config.EnableJpaRepositories;@SpringBootApplication@EnableJpaRepositories(basePackages = "com.example.userApi.repository")public class UserApiApplication { public static void main(String[] args) { SpringApplication.run(UserApiApplication.class, args); }}UserController.java
package com.example.userApi.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import com.example.userApi.model.User;import com.example.userApi.repository.UserRepository;import java.util.List;@RestController@RequestMapping("/api/users")public class UserController { @Autowired private UserRepository userRepository; // Create User @PostMapping public User createUser(@RequestBody User user) { return userRepository.save(user); } // Get All Users @GetMapping public List<User> getAllUsers() { return userRepository.findAll(); } // Get User by ID @GetMapping("/{id}") public User getUserById(@PathVariable Long id) { return userRepository.findById(id).orElseThrow(() -> new RuntimeException("User not found")); } // Update User @PutMapping("/{id}") public User updateUser(@PathVariable Long id, @RequestBody User userDetails) { User user = userRepository.findById(id).orElseThrow(() -> new RuntimeException("User not found")); user.setFirstName(userDetails.getFirstName()); user.setLastName(userDetails.getLastName()); user.setAge(userDetails.getAge()); user.setOccupation(userDetails.getOccupation()); return userRepository.save(user); } // Delete User @DeleteMapping("/{id}") public String deleteUser(@PathVariable Long id) { User user = userRepository.findById(id).orElseThrow(() -> new RuntimeException("User not found")); userRepository.delete(user); return "User deleted successfully"; }}User.java
package com.example.userApi.model;import javax.persistence.*;@Entitypublic class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(nullable = false) private String firstName; @Column(nullable = false) private String lastName; @Column private int age; @Column private String occupation; // Getters and Setters 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; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getOccupation() { return occupation; } public void setOccupation(String occupation) { this.occupation = occupation; }}UserRepository.java
package com.example.userApi.repository;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.stereotype.Repository;import com.example.userApi.model.User;@Repositorypublic interface UserRepository extends JpaRepository<User, Long> {}application.properties. This might also help
server.port=5052# Oracle Database Configurationspring.datasource.url=jdbc:oracle:thin:@localhost:1521:XEspring.datasource.username=restspring.datasource.password=restspring.datasource.driver-class-name=oracle.jdbc.OracleDriver# Hibernate Configurationspring.jpa.database-platform=org.hibernate.dialect.Oracle12cDialectspring.jpa.hibernate.ddl-auto=updatepom.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><groupId>com.example</groupId><artifactId>userApi</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>userApi</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- Spring Boot Starter Web --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.7.5</version></dependency><!-- Spring Boot Starter Data JPA --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId><version>2.7.5</version></dependency><!-- Oracle JDBC Driver --><dependency><groupId>com.oracle.database.jdbc</groupId><artifactId>ojdbc8</artifactId><version>19.16.0.0</version><scope>runtime</scope></dependency><dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>5.2.3.Final</version> </dependency><dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.0</version> </dependency></dependencies></project>