通过“ employeeDao”字段表示不满意的依赖关系；
[英]Unsatisfied dependency expressed through field 'employeeDao';
问题描述
I am fresh to spring boot and currently facing this error in STS
"Error creating bean with name 'employeeDao': Unsatisfied dependency expressed through field 'sessionfactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException"
Entity Class
@Entity
@Table(name = "studenttable")
public class Employee {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
@Column(name = "sname")
private String sname;
@Column(name = "scourse")
private String cname;
@Column(name = "sfee")
private Double fee;
Hibernate Utils Class
@Configuration
public class HibernateUtilsConfig {
@Autowired
private EntityManagerFactory entityManagerFactory;
@Bean
public SessionFactory getSessionFactoty() {
if(entityManagerFactory.unwrap(SessionFactory.class)== null) {
throw new NullPointerException("Factory Not Found");
}
return entityManagerFactory.unwrap(SessionFactory.class);
}
DAO Class
@Repository
public class EmployeeDao {
@Autowired
private SessionFactory sessionfactory;
public void createEmployee(Employee employee) {
Session session = null;
try {
session = sessionfactory.openSession();
session.beginTransaction();
Integer id=(Integer) session.save(employee);
System.out.println("The record is add in the system" + id);
session.getTransaction().commit();
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
Main Class
@SpringBootApplication
public class SpringExampleApplication implements CommandLineRunner {
@Autowired
private EmployeeDao employeeDao;
public static void main(String[] args) {
SpringApplication.run(SpringExampleApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
Employee employee = getEmployee();
employeeDao.createEmployee(employee);
}
private Employee getEmployee() {
Employee employee = new Employee();
employee.setSname("Imran");
employee.setCname("Java");
employee.setFee(1000d);
return employee;
}
**Error Log**
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name springExampleApplication: Unsatisfied dependency expressed through field 'employeeDao';
org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为springExampleBean的bean时出错：通过字段'employeeDao'表示的不满足的依赖关系； nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error` creating bean with name 'employeeDao': Unsatisfied dependency expressed through field 'sessionfactory';
Please help me, 请帮我，
Thank you! 谢谢！
1 个解决方案
解决方案1
0 已采纳 2019-06-28 11:20:18
The issue that you are facing is due to the HibernateUtilsConfig.java configuration class that you have provided.In your EmployeeDao class you are autowiring the sessionfactory bean. 您面临的问题归因于您提供的HibernateUtilsConfig.java配置类。在EmployeeDao类中，您正在自动sessionfactory bean。 So , when springboot tries to autowire the bean , it fails with the following error : 因此，当springboot尝试自动装配bean时，它将失败并显示以下错误：
Unsatisfied dependency expressed through field 'sessionfactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'hibernateUtilsConfig': Unsatisfied dependency expressed through field 'entityManagerFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'getSessionFactoty': Requested bean is currently in creation: Is there an unresolvable circular reference?
becase entityManagerFactory bean is not available. entityManagerFactory bean不可用。
Since you are using spring-boot , you may not configure everything manually. 由于您使用的是spring-boot，因此可能无法手动配置所有内容。 You can use the default auto configurations from spring-boot by adding the following dependency : 您可以通过添加以下依赖项来使用spring-boot中的默认自动配置：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
then , you could provide the appropriate keys in the application.properties or application.yml and spring-boot will configure everything for you. 然后，您可以在application.properties或application.yml中提供适当的密钥，并且spring-boot将为您配置所有内容。
application.properties application.properties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=mysqluser
spring.datasource.password=mysqlpass
spring.datasource.url=jdbc:mysql://localhost:3306myDb?createDatabaseIfNotExist=true
If you still want to set everything up manually try creating the entity manager bean like : 如果您仍然想手动设置所有内容，请尝试创建实体管理器bean，例如：
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean em
= new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource());
em.setPackagesToScan(new String[] { "com.example.persistence.model" });
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
em.setJpaProperties(additionalProperties());
return em;
}
Reference documentation . 参考文档 。
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