I am in the process of developing a Spring Boot application and came across this error when starting the server. I am not sure if I am incorrectly defining any annotations or missing any dependencies. Any help would be appreciated.
Main class:
@SpringBootApplication
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class DemoApplication {
public static void main(String[] args) {
System.out.println("Hello world");
SpringApplication.run(DemoApplication.class, args);
}
}
UserService class:
@Service
public class UserService implements IUserService {
@Autowired
private UserDAO userDAO;
@Override
public List<UserDTO> getAllUsers() {
List<User> entities = userDAO.getUsers();
List<UserDTO> users = new ArrayList<UserDTO>();//Will never use directly User Object, will be using Tranferable objects
Iterator<User> iterator = entities.iterator();
while(iterator.hasNext()) {
User user = iterator.next();
users.add(ApiDTOBuilder.userToUserDTO(user));//We are building UserDTO object.
}
return users;
}
@Override
public UserDTO getUserByUsername(String username) {
User user = userDAO.getUser(username);
return ApiDTOBuilder.userToUserDTO(user);
}
@Override
public void createUser(UserDTO user) {
userDAO.createUser(ApiDTOBuilder.userDTOToUser(user));
}
@Override
public void updateUser(UserDTO user) {
userDAO.updateUser(ApiDTOBuilder.userDTOToUser(user));
}
@Override
public void deleteUser(String username) {
userDAO.deleteUser(username);
}
}
UserDAO class:
@Repository public class UserDAO implements IUserDAO {
@PersistenceContext
EntityManager em;//JPA EntityManager is used to access a database in a particular application. It is used to manage persistent entity instances, to find entities by their primary key identity(As here is Username), and to query over all entities.
@Override
@Transactional
public User getUser(String username) {
return em.find(User.class, username); //Here entitymanager can find the username as it has the capability to find an entity by unique identifies
}
@Override
@Transactional
public List<User> getUsers() {
List<User> resultList = em.createQuery("FROM user_tbl", User.class).getResultList();
return resultList;
}
@Override
@Transactional
public void createUser(User user) {
em.persist(user);//Make an instance managed and persistent.
}
@Override
@Transactional
public void updateUser(User user) {
em.merge(user);//Merge the state of the given entity into the current persistence context.
}
@Override
@Transactional
public void deleteUser(String username) {
User user = this.getUser(username);
em.remove(user);//Remove the entity instance.
}
}
Build.gradle:
buildscript {
ext {
springBootVersion = '2.0.0.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.hibernate.javax.persistence:hibernate-jpa-2.1-api:1.0.0.Final')
compile('javax.xml.bind:jaxb-api:2.2.11')
compile('org.springframework.boot:spring-boot-starter-test:2.0.2.RELEASE')
compile('com.sun.xml.bind:jaxb-core:2.2.11')
compile('com.sun.xml.bind:jaxb-impl:2.2.11')
runtime('org.springframework.boot:spring-boot-devtools')
runtime('mysql:mysql-connector-java')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
Error message:
***************************
APPLICATION FAILED TO START
***************************
Description:
Field userDAO in com.example.demo.service.UserService required a bean of type 'javax.persistence.EntityManagerFactory' that could not be found.
Action:
Consider defining a bean of type 'javax.persistence.EntityManagerFactory' in your configuration.
I saw all the relevant answers and tried to implement those suggestions like adding dependencies, adding notations in the main class, etc. But it shows the same error. Please someone help me out. Thank you in advance.
P.S: Github link of my application: https://github.com/heliOpenxCell/demo
