我将当前的5.1休眠设置迁移到新的5.2.14。我在上下文初始化期间得到了NPE：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'carFactory': Unsatisfied dependency expressed through field 'makeDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'makeDAOImpl': Unsatisfied dependency expressed through field 'databaseUtilities'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'databaseUtilities': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in com.migration.core.config.HibernateConfiguration: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4861)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'makeDAOImpl': Unsatisfied dependency expressed through field 'databaseUtilities'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'databaseUtilities': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in com.migration.core.config.HibernateConfiguration: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
... 24 more
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'databaseUtilities': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in com.migration.core.config.HibernateConfiguration: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
... 37 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in com.migration.core.config.HibernateConfiguration: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1710)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:583)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
... 50 more
Caused by: java.lang.NullPointerException
at org.hibernate.metamodel.internal.AttributeFactory.getMetaModelType(AttributeFactory.java:202)
at org.hibernate.metamodel.internal.AttributeFactory.buildPluralAttribute(AttributeFactory.java:176)
at org.hibernate.metamodel.internal.AttributeFactory.buildAttribute(AttributeFactory.java:82)
at org.hibernate.metamodel.internal.MetadataContext.wrapUp(MetadataContext.java:213)
at org.hibernate.metamodel.internal.MetamodelImpl.initialize(MetamodelImpl.java:220)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:300)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:460)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:710)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
at org.springframework.orm.hibernate5.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:535)
at org.springframework.orm.hibernate5.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:519)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1769)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706)
... 60 more
以下是我的豆子。 HibernateConfiguration.java：
@Configuration
@EnableTransactionManagement
@PropertySource({ "classpath:core.properties" })
@ComponentScan({ "com.migration.core.domain" })
public class HibernateConfiguration {
private static Logger logger = Logger.getLogger(HibernateConfiguration.class);
private final static String HIBERNATE_DIALECT = "org.hibernate.dialect.PostgreSQL95Dialect";
@Autowired private Environment env;
@Autowired private ResourceLoader resourceLoader;
@Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
localSessionFactoryBean.setDataSource(dataSource());
localSessionFactoryBean.setPackagesToScan(new String[] { "com.migration.core.domain.*" });
localSessionFactoryBean.setMappingLocations(loadResources());
localSessionFactoryBean.setHibernateProperties(hibernateProperties());
return localSessionFactoryBean;
}
private Resource[] loadResources() {
Resource[] resources = null;
try {
resources = ResourcePatternUtils.getResourcePatternResolver(resourceLoader)
.getResources("classpath:/hibernate/**/*.hbm.xml");
} catch (IOException e) {
e.printStackTrace();
}
return resources;
}
@Bean
public DataSource dataSource() {
ComboPooledDataSource сomboPooledDataSource = new ComboPooledDataSource();
try {
сomboPooledDataSource.setDriverClass(Preconditions.checkNotNull(env.getProperty("jdbc.driver-class-name")));
} catch( PropertyVetoException pve ){
logger.error("Cannot load datasource driver (" + env.getProperty("jdbc.driver-class-name") +"): " + pve.getMessage());
return null;
}
сomboPooledDataSource.setJdbcUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
сomboPooledDataSource.setUser(Preconditions.checkNotNull(env.getProperty("jdbc.username")));
сomboPooledDataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.password")));
сomboPooledDataSource.setMinPoolSize(20);
сomboPooledDataSource.setMaxPoolSize(50);
сomboPooledDataSource.setCheckoutTimeout(15);
сomboPooledDataSource.setMaxStatements(0);
сomboPooledDataSource.setIdleConnectionTestPeriod(30);
return сomboPooledDataSource;
}
@Bean
public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) throws Exception{
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
transactionManager.setSessionFactory(sessionFactory().getObject());
return transactionManager;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){
return new PersistenceExceptionTranslationPostProcessor();
}
private static Properties hibernateProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.dialect", HIBERNATE_DIALECT);
properties.setProperty("hibernate.bytecode.use_reflection_optimizer", "true");
properties.setProperty("hibernate.show_sql", "false");
properties.setProperty("hibernate.hbm2ddl.auto", "validate");
properties.setProperty("hibernate.default_batch_fetch_size", "1000");
properties.setProperty("hibernate.max_fetch_depth", "2");
properties.setProperty("hibernate.generate_statistics", "false");
properties.setProperty("hibernate.default_schema", "EDRIVE");
properties.setProperty("hibernate.connection.CharSet", "utf8");
properties.setProperty("hibernate.connection.characterEncoding", "utf8");
properties.setProperty("hibernate.connection.useUnicode", "true");
properties.setProperty("hibernate.connection.release_mode", "after_transaction");
properties.setProperty("hibernate.jdbc.batch_size", "50");
properties.setProperty("hibernate.jdbc.fetch_size", "500");
properties.setProperty("hibernate.jdbc.use_scrollable_resultset", "false");
properties.setProperty("hibernate.cache.region.factory_class", "org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory");
properties.setProperty("hibernate.cache.use_query_cache", "true");
properties.setProperty("hibernate.cache.use_second_level_cache", "true");
properties.setProperty("hibernate.cache.use_structured_entries", "false");
properties.setProperty("hibernate.current.session.context.class", "org.springframework.orm.hibernate5.SpringSessionContext");
return properties;
}
}
DatabaseUtilities.java：
@Repository
public class DatabaseUtilities {
static ThreadLocal<Connection> connection = new ThreadLocal<Connection>();
@Autowired private HibernateConfiguration configuration;
@Autowired private SessionFactory sessionFactory;
@Autowired private ApplicationContextProvider contextProvider;
@Autowired private SequencesDAO sequencesDao;
@Autowired private LanguageFactory languages;
// get connection for further use
public Connection getConnection() {
if (connection.get() == null) {
try {
//loading the database driver
configuration.dataSource().getConnection();
} catch (SQLException e) {
//do something to deal with the error of missing database driver e.g notification to the user.
e.printStackTrace();
}
SessionImplementor session = (SessionImplementor)sessionFactory.openSession();
connection.set(session.connection());
}
return connection.get();
}
// get sessionFactory's configuration
public Configuration getSessionFactoryConfiguration() {
ApplicationContext context = contextProvider.getApplicationContext();
LocalSessionFactoryBean sessionFactoryBean = context.getBean("&sessionFactory",LocalSessionFactoryBean.class);
return sessionFactoryBean.getConfiguration();
}
/**
* Returns a sequence NEXTVAL value
* @param seqName
* @return NEXTVAL value
*/
public long getSequenceNextval( String seqName ) {
return sequencesDao.getNext(seqName);
}
/**
* Returns Hibernate sessionFactory bean
* @return SessionFactory
*/
public SessionFactory getSessionFactory() {
return this.sessionFactory;
}
/**
* Returns session from the session factory
*/
public Session getSession() {
return getSessionFactory().openSession();
}
/**
* Clears current session
*/
public void clearSession( Session session ) {
session.clear();
}
/**
* Closes current session
*/
public void closeSession( Session session ) {
session.close();
}
/**
* Extracts and converts meta data from the Hibernate's PersistentEntity
* @param list
* @return entity
*/
public List<? extends Entity<Long>> convertMetaData(List<? extends Entity<Long>> list) {
List<Language> languagesList = languages.getList();
list.forEach(entity->{
Map<Language, EntityMetaData> metaData = new HashMap<>();
// Copy the original package items into the key set
for (Language key : entity.getMetaData().keySet()) {
int keyIndex = languagesList.indexOf(key);
if (keyIndex > -1) {
metaData.put(languagesList.get(keyIndex), entity.getMetaData().get(key));
}
}
entity.setMetaData(metaData);
});
return list;
}
/**
* Converts meta data into the HashMap from the PersistentMap
* @param <T>
* @param <T>
* @param metaData
* @return HashMap
*/
@SuppressWarnings("unchecked")
public <T> Map<Language,EntityMetaData> convertMetaData( T entity ) {
List<Language> languagesList = languages.getList();
Map<Language, EntityMetaData> metaData = new HashMap<>();
// Copy the original package items into the key set
for (Language key : ((Entity<Long>) entity).getMetaData().keySet()) {
int keyIndex = languagesList.indexOf(key);
if (keyIndex > -1) {
if( ((Entity<Long>) entity).getMetaData().size() > 0 ) {
metaData.put(languagesList.get(keyIndex), ((Entity<Long>) entity).getMetaData().get(key));
} else {
metaData.put(languagesList.get(keyIndex), new EntityMetaData());
}
}
}
return metaData;
}
public ReturningWork<Long> callStoredProcedure(Supplier<String> query) {
ReturningWork<Long> work = ((Connection connection)->{
try( PreparedStatement preparedStatement = connection.prepareStatement(query.get());
ResultSet resultSet = preparedStatement.executeQuery(); ) {
connection.commit();
resultSet.next();
return resultSet.getLong(1);
} catch( SQLException e ) {
throw e;
}
});
return work;
}
@PostConstruct
public void setupSessionFactory() throws Exception {
// A SessionFactory is set up once for an application!
final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
.configure()
.build();
try {
sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
} catch (Exception e) {
// The registry would be destroyed by the SessionFactory, but we had trouble building the SessionFactory
// so destroy it manually.
StandardServiceRegistryBuilder.destroy( registry );
}
}
}
CarFactory自动装配MakeDao，它自动装配在HibernateConfiguration（标准设置）中定义的SessionFactory。
@Autowired private DatabaseUtilities databaseUtilities;
我没有使用JPA，所以我不需要EntityManagerFactory - 只是一个简单的SessionFactory。另外，我想避免使用XML进行配置。我的新实施有什么问题？
答案 0 :(得分：1)
将sessionFactory方法更改为：
@Bean
public SessionFactory sessionFactory() {
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
localSessionFactoryBean.setDataSource(dataSource());
localSessionFactoryBean.setPackagesToScan(new String[] { "com.migration.core.domain.*" });
localSessionFactoryBean.setMappingLocations(loadResources());
localSessionFactoryBean.setHibernateProperties(hibernateProperties());
return localSessionFactoryBean.getObject(); // here is the important change
}
创建sessionFactory的另一种方法：
@Bean
public SessionFactory sessionFactory() {
return new LocalSessionFactoryBuilder(dataSource())
.scanPackages("com.example.entities")
//.addFile() this should work for your xml files
.buildSessionFactory();
}