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@Repositorypublic 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@SpringBootApplicationpublic class SpringExampleApplication implements CommandLineRunner { @Autowired private EmployeeDao employeeDao; public static void main(String[] args) { SpringApplication.run(SpringExampleApplication.class, args); }
1 回答
慕斯王
TA貢獻1864條經驗 獲得超2個贊
您面臨的問題是由于HibernateUtilsConfig.java您提供的配置類引起的。在您的 EmployeeDao 類中，您正在自動裝配sessionfactorybean。因此，當 springboot 嘗試自動裝配 bean 時，它會失敗并出現以下錯誤：
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?
因為entityManagerFactorybean 不可用。
由于您使用的是 spring-boot ，因此您可能無法手動配置所有內容。您可以通過添加以下依賴項來使用 spring-boot 的默認自動配置：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
然后，您可以在 application.properties 或 application.yml 中提供適當的鍵，spring-boot 將為您配置所有內容。
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
如果您仍想手動設置所有內容，請嘗試創建實體管理器 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;
}
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