每当启动应用程序 spring boot 时,我都会收到以下错误。
应用程序启动失败
描述:
com.base.model.AbstractDao 中的字段 session 需要一个类型为“org.hibernate.SessionFactory”的 bean,但找不到。
行动:
考虑在您的配置中定义类型为“org.hibernate.SessionFactory”的 bean。
我已经添加了我的应用程序的实现:
POM.xml
<?xml version="1.0" encoding="UTF-8"?>
<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>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Hibernate dependency -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.1.5.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.0.3.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
应用程序属性
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username = root
spring.datasource.password = root
hibernate.dialect = org.hibernate.dialect.MySQLDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate4.SpringSessionContext
配置类
@Configuration
@EnableTransactionManagement
@ComponentScan({"configure"})
@PropertySource({"classpath:application.properties"})
public class HibernateConfiguration {
@Autowired
private Environment environment;
@Bean
public LocalSessionFactoryBean sessionFactory(){
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setPackagesToScan(new String[]{"com.base","com.base.model"});
sessionFactory.setMappingResources(new String[]{"Employee.hbm.xml"});
sessionFactory.setHibernateProperties(hibernateProperties());
return sessionFactory;
}
@Bean
public Properties hibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", environment.getRequiredProperty("hiberante.show_sql"));
properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
return properties;
}
@Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
dataSource.setUsername(environment.getRequiredProperty("jdbc.userName"));
dataSource.setUsername(environment.getRequiredProperty("jdbc.password"));
return dataSource;
}
@Bean
public SessionFactory sessionFactory(HibernateEntityManagerFactory hemf){
return hemf.getSessionFactory();
}
}
员工.java
public class Employee implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private int id;
private String name;
private String country;
public int getId(){
return this.id;
}
public void setId(int id){
this.id = id;
}
public String getName(){
return this.name;
}
public void setName(String name){
this.name = name;
}
public void setCountry(String country){
this.country = country;
}
public String getCountry(){
return this.getCountry();
}
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + ", country="
+ country + "]";
}
}
员工.hbm.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.base.model.Employee" table="Person">
<id name="id" type="java.lang.Integer">
<generator class="native"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="name" not-null="true"></column>
</property>
<property name="country" type="java.lang.String">
<column name="country"></column>
</property>
</class>
</hibernate-mapping>
EmployeeDaoImpl
@Component
public class EmployeeDataDaoImpl {
@Autowired
SessionFactory sessionFactory;
public List<Employee> findAllEmployee(){
//// Criteria cri = getSession().createCriteria(Employee.class);
// List<Employee> dbList = cri.list();
// for (Employee employee : dbList) {
// System.out.println(employee.getCountry());
// }
return null;
}
}
我在 stackoverflow 上查找了相同的错误代码,但没有一个解决方案有效,因此将其与我的代码一起再次发布在这里。 希望其他人可以指出我哪里出错了。
最佳答案
对于初学者来说,您的配置有几件事
- 混合来自不同 Spring 和 Hibernate 版本的 jar
- 也可能已经管理依赖项
- 努力变得比 Spring Boot 更聪明。
对于 1. 和 2. 只需删除 <version>
spring-orm
的标签和 hibernate-core
和 hibernate-entitymanager
管理器依赖项。 Spring Boot 已经在管理这些。您实际上可以删除所有 org.springframework
那些已经被初学者引入的依赖项(实际上还有 hibernate 的依赖项)。
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
接下来在您的配置中您至少有 2 个 SessionFactory
的配置。我建议使用注释来定义您的实体而不是 hbm.xml
文件。
@Entity
@Table("person")
public class Employee implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
private int id;
@Column(nullable=false)
private String name;
private String country;
}
当使用 JPA 注释时,Hibernate 将自动检测您的实体(特别是与 Spring Boot 结合使用),这使得它非常强大。当然你现在可以删除你的 Employee.hbm.xml
.
下一个你的EmployeeDataDaoImpl
我强烈建议使用普通的 JPA 而不是普通的 Hibernate。通常,这足以让您使用。
@Repository
public class EmployeeDataDaoImpl {
@PersistenceContext
private EntityManager entityManger;
public List<Employee> findAllEmployee(){
return em.createQuery("select e from Employee e", Employee.class).getResultList();
}
}
使用此设置,您基本上可以完全删除 HibernateConfiguration
.是的,你可以,因为 Spring Boot 会检测到 Hibernate 并自动创建一个 JpaTransactionManager
, 启用交易并预配置 EntityManagerFactory
.
如果你真的想使用带有 SessionFactory
的普通 hibernate 模式只需使用 HibernateJpaSessionFactoryBean
暴露底层 SessionFactory
的 EntityManagerFactory
.
@Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
HibernateJpaSessionFactoryBean factory = new HibernateJpaSessionFactoryBean();
factory.setEntityManagerFactory(emf);
return factory;
}
但是,如前所述,我强烈建议使用纯 JPA,因为它更容易设置,而且就 JPA 的当前状态而言,它提供的功能几乎与纯 Hibernate 一样多。
专业提示
您依赖于 spring-boot-starter-data-jpa
这意味着您依赖于 Spring Data JPA。如果您使用 JPA,这会让事情变得更容易。您可以删除您的 EmployeeDataDaoImpl
只需创建一个界面并使用它即可。
public interface EmployeeRepository extends JpaRepository<Employee, Long> {}
就是这样,所有 CRUD 方法(findOne
、findAll
、save
等)都已为您提供,您无需创建实现。
关于java - 需要找不到类型为 'org.hibernate.SessionFactory' 的 bean,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43533691/