java - JpaRepositories 的 UnsatisfiedDependencyException
问题描述
我正在编写一个 jpa 存储库示例,我得到一个 UnsatisfiedDependencyException 类型的运行时异常。
这是我的程序:
@Configuration
@EnableJpaRepositories(basePackageClasses = { PersonRepository.class, ProfessionRepository.class})
@ComponentScan( basePackageClasses =MyService.class)
public class SpringDataJpa {
public static void main( String[] args ) {
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringDataJpa.class);
service myService = applicationContext.getBean(MyService.class);
}
}
服务接口:
public interface service {
void add( Person person );
List<Person> getListOfPersons();
}
抛出异常的实现:
@Service
public class MyService implements service {
@Autowired
PersonRepository personRepository;
@Override
public void add( Person person ){
System.out.println("saved");
}
@Override
public List<Person> getListOfPersons() {
return null;
}
}
存储库:
@Repository
public interface PersonRepository extends JpaRepository<Person, Integer> {
}
@Repository
public interface ProfessionRepository extends JpaRepository<Profession, Integer> {
}
我得到的例外:
线程“主”org.springframework.beans.factory.UnsatisfiedDependencyException 中的异常:创建名称为“myService”的 bean 时出错:通过字段“personRepository”表示不满足的依赖关系;嵌套异常是 org.springframework.beans.factory.BeanCreationException:创建名为“personRepository”的 bean 时出错:合并 bean 定义的后处理失败;嵌套异常是 java.lang.NoClassDefFoundError: javax/persistence/SynchronizationType
当我检查这个讨论时,我添加了建议的依赖项。我在 pom.xml 文件中的依赖项:
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.197</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.1.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.1.5.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
如何解决这个错误?
我的第二个问题是: @EnableJpaRepositories
如果我们使用 Spring Boot,我们应该使用吗?
解决方案
缺少数据源和 entityManagerFactory bean。为了解决我的问题,我在配置类中添加了以下代码:
@Bean
public DataSource firstDataSource (){
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
driverManagerDataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
driverManagerDataSource.setUrl("jdbc:mysql://localhost:3306/ride_tracker?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC");
driverManagerDataSource.setUsername("root");
driverManagerDataSource.setPassword("password");
return driverManagerDataSource;
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory( DataSource dataSource) {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource);
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setPackagesToScan("data");
Properties jpaProperties = new Properties();
jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
entityManagerFactoryBean.setJpaProperties(jpaProperties);
return entityManagerFactoryBean;
}
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