我一直在尝试spring-data-jpa。在Reference Documentation和我之前的春天知识的帮助下，我已经设置了spring-data-jpa配置，但Repository我@Autowired总是返回null。我在这里提到了其他问题，但我还没有找到解决方案。
我的 ApplicationContext 配置是
@Configuration
@EnableJpaRepositories("devopsdistilled.operp.server.data")
@EnableTransactionManagement
@PropertySource("server/jdbc.properties")
@ComponentScan("devopsdistilled.operp.server.data")
public class JpaContext {
@Inject
private Environment env;
@Value("devopsdistilled.operp.server.data.entity")
private String packagesToScan;
@Bean
public static PropertySourcesPlaceholderConfigurer getPropertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}
@Bean
public DataSource dataSource() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName(env.getProperty("jdbc.driverClassName"));
dataSource.setUrl(env.getProperty("jdbc.url"));
dataSource.setUsername(env.getProperty("jdbc.username"));
dataSource.setPassword(env.getProperty("jdbc.password"));
dataSource.setInitialSize(2);
dataSource.setMaxActive(10);
return dataSource;
}
@Bean
public JpaVendorAdapter jpaVendorAdapter() {
HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
jpaVendorAdapter.setDatabase(Database.MYSQL);
jpaVendorAdapter.setGenerateDdl(true);
jpaVendorAdapter.setShowSql(true);
jpaVendorAdapter
.setDatabasePlatform("org.hibernate.dialect.MySQL5Dialect");
return jpaVendorAdapter;
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
emf.setDataSource(this.dataSource());
emf.setJpaVendorAdapter(this.jpaVendorAdapter());
emf.setPackagesToScan(packagesToScan);
emf.setJpaProperties(this.hibernateProperties());
return emf;
}
@Bean
public JpaDialect jpaDialect() {
return new HibernateJpaDialect();
}
@Bean
public JpaTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory()
.getObject());
transactionManager.setJpaDialect(jpaDialect());
return transactionManager;
}
@Bean
public Properties hibernateProperties() {
Properties hibernateProps = new Properties();
hibernateProps.setProperty("hibernate.hbm2ddl.auto", "create");
return hibernateProps;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslationPostProcessor() {
return new PersistenceExceptionTranslationPostProcessor();
}
}
我的实体定义如下
@Entity
public class Item implements Serializable {
private static final long serialVersionUID = 7751126479626962944L;
private Long id;
private String name;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return new String("Id: " + getId() + "\nName: " + getName());
}
}
我的存储库定义如下
private static final long serialVersionUID = 7751126479626962944L;
private Long id;
private String name;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return new String("Id: " + getId() + "\nName: " + getName());
}
我尝试按如下方式运行示例应用程序
@Repository
public interface ItemRepository extends JpaRepository {
}
我在控制台中获得以下输出。
public class ServerApp {
@Inject
ItemRepository itemRepository;
public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(
JpaContext.class);
new ServerApp().sampleMethod();
System.out.println(context);
}
public void sampleMethod() {
Item item = new Item();
item.setName("Test Item");
item = itemRepository.save(item);
System.out.println(itemRepository.findOne(item.getId()));
System.out.println("From sampleMethod");
}
}
正如在输出中可以看到的那样，有@Inject
ItemRepository itemRepository;
public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(
JpaContext.class);
new ServerApp().sampleMethod();
System.out.println(context);
}
public void sampleMethod() {
Item item = new Item();
item.setName("Test Item");
item = itemRepository.save(item);
System.out.println(itemRepository.findOne(item.getId()));
System.out.println("From sampleMethod");
}
因此
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Apr 29, 2013 5:31:24 PM org.hibernate.annotations.common.Version
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
Apr 29, 2013 5:31:24 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.9.Final}
Apr 29, 2013 5:31:24 PM org.hibernate.cfg.Environment
INFO: HHH000206: hibernate.properties not found
Apr 29, 2013 5:31:24 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Apr 29, 2013 5:31:24 PM org.hibernate.ejb.Ejb3Configuration configure
INFO: HHH000204: Processing PersistenceUnitInfo [
name: default
...]
Apr 29, 2013 5:31:24 PM org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator instantiateExplicitConnectionProvider
INFO: HHH000130: Instantiating explicit connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
Apr 29, 2013 5:31:25 PM org.hibernate.dialect.Dialect
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
Apr 29, 2013 5:31:25 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
Apr 29, 2013 5:31:25 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory
INFO: HHH000397: Using ASTQueryTranslatorFactory
Apr 29, 2013 5:31:25 PM org.hibernate.validator.internal.util.Version
INFO: HV000001: Hibernate Validator 4.3.1.Final
Apr 29, 2013 5:31:25 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: HHH000227: Running hbm2ddl schema export
Hibernate: drop table if exists Item
Hibernate: create table Item (id bigint not null auto_increment, name varchar(255), primary key (id))
Apr 29, 2013 5:31:25 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: HHH000230: Schema export complete
Exception in thread "main" java.lang.NullPointerException
at devopsdistilled.operp.server.ServerApp.sampleMethod(ServerApp.java:27)
at devopsdistilled.operp.server.ServerApp.main(ServerApp.java:20)
不是NullPointerException。
我为Repository写了一个 Test ，如下所示。
ItemRepository
我的配置缺少什么？
如何解决此问题？
由于
答案 0 :(得分：3)
我认为问题在于这一行：
new ServerApp().sampleMethod();
从main调用时，您仍然可以依赖自动装配，但是需要使用ApplicationContext来检索bean。
像这样：
ServerApp app = context.getBean("ServerApp");
注意重要的是要注意这个功能是否过载，所以你可能有更好的运气了
使用new关键字时，您绕过Spring并使用纯Java实例化。
答案 1 :(得分：3)
您是否尝试使用JpaRepository泛型as explaneid in the docs声明存储库？
@Repository
public interface ItemRepository extends JpaRepository<Item, Long> {
}
在我的情况下，如果没有指定ID和实体类型，它就无法工作。希望这会有所帮助。
此外，如果您想在测试中手动初始化存储库，请使用以下内容：
@Before
public void init() {
JpaRepositoryFactory jpaRepositoryFactory = new JpaRepositoryFactory(entityManager);
yourRepository = jpaRepositoryFactory.getRepository(YourRepository.class);
assertNotNull(yourRepository);
// In case your need to initialize a custom repository use this
OtherRepositoryCustom otherRepoImpl = new OtherRepositoryImpl();
otherRepository = jpaRepositoryFactory.getRepository(OtherRepository.class, otherRepoImpl);
assertNotNull(otherRepository);
}