我使用 Spring 4.3、hibernate 5 和 MySQL 5.6 创建了 Web 应用程序。
从 Spring 我正在使用 - 1.Spring处理程序拦截器-用于过滤每个请求。
2.Spring MVC - 管理 REST Web 资源。
3.Spring AOP - 作为声明式方法的事务管理器(@Transactional)
4.Hibernate - ORM 和 session 连接管理。
应用程序已成功部署在服务器上,我可以登录。
现在让我们谈谈我的问题:- 我登录到应用程序并连续点击请求(使用 f5)一段时间后从 hibernate DAO 层抛出异常。
每次都会遇到不同的异常,例如:-
org.springframework.orm.hibernate5.HibernateSystemException:HHH000479:集合[dao.domain.WebService.webServicePermissionMaps]未由flush()处理。这可能是由于 session 的不安全使用(例如,同时在多个线程中使用、在实体生命周期 Hook 期间更新)。
内部服务器错误发现同一集合的两种表示形式: dao.domain.WebService.webServicePermissionMaps;
3.${PATTERN}${PATTERN} java.lang.NullPointerException: null 在 org.hibernate.event.internal.AbstractFlushingEventListener.prepareCollectionFlushes(AbstractFlushingEventListener.java:178) ~[hibernate-core-5.2.7.Final.jar:5.2.7.Final]
4.${PATTERN}${PATTERN} org.springframework.orm.hibernate5.HibernateSystemException:找到对集合的共享引用:dao.domain.WebService.webServicePermissionMaps;嵌套异常是 org.hibernate.HibernateException:找到对集合的共享引用:dao.domain.WebService.webServicePermissionMaps。
5.引起:java.sql.SQLException:语句关闭后不允许执行任何操作。 在 com.mysql.jdbc.SQLError.createSQLException(SQLError.java:998) ~[mysql-connector-java-5.1.36.jar:5.1.36]
以下是我的代码:-
Spring 配置-
@Configuration
@EnableWebMvc
@Import({DbConfiguration.class})
@ComponentScan(basePackages = "com")
@PropertySource("classpath:application.properties")
public class RestConfig extends WebMvcConfigurerAdapter {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(authenticationInterceptor()).excludePathPatterns("/security/authenticate").excludePathPatterns("/security/ssoAuthenticate");
registry.addInterceptor(authorizationInterceptor()).excludePathPatterns("/security/authenticate").excludePathPatterns("/security/ssoAuthenticate");
}
@Bean
public AuthorizationInterceptor authorizationInterceptor() {
return new AuthorizationInterceptor();
}
}
数据库配置类-
@Configuration
@EnableTransactionManagement
public class DbConfiguration {
@Bean
public DataSource dataSource() throws NamingException {
return (DataSource) new JndiTemplate().lookup(env.getRequiredProperty("jdbc.url"));
}
@Bean
@Autowired
public LocalSessionFactoryBean sessionFactory() throws NamingException {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setPackagesToScan(new String[]{"com.dao"});
sessionFactory.setHibernateProperties(hibProperties());
return sessionFactory;
}
@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager tm = new HibernateTransactionManager();
tm.setSessionFactory(sessionFactory);
return tm;
}
private Properties hibProperties() {
Properties properties = new Properties();
properties.put(PROPERTY_NAME_HIBERNATE_DIALECT, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, "false");
return properties;
}
}
Spring 拦截器-
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {
private static Logger log = LoggerFactory.getLogger(AuthenticationInterceptor.class);
@Autowired
private ApplicationContext appContext;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
//variables declaration
try {
servicePath = (String ) request.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE);
WebServiceUtil webServiceUtil = (WebServiceUtil)appContext.getBean("webServiceUtil");
//This method causing hibernate erroe
boolean isAccessible = webServiceUtil.isWebServiceAccessbile(roles, servicePath, request.getMethod());
}catch (Exception e) {
log.error("Error occured in AuthorizationInterceptor.preHandle method role are : "+roles, e);
response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
response.getWriter().write(e.getMessage());
return false;
}
return true;
}
}
-Util Class(希望此类bean进入请求范围。此类没有@Transactional)
@Service("webServiceUtil")
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS, value = "request")
public class WebServiceUtil {
@Autowired
private AuthorizationService authorizationService;
public boolean isWebServiceAccessbile(Set<String> roles, String basePath, String methodType)
throws SysException {
try {
List<WebService> webservices = authorizationService.getWebService(roles, methodType);
List<String> webserviceUrl = new ArrayList<String>();
for (WebService webService : webservices) {
webserviceUrl.add(webService.getUrl());
}
return webserviceUrl.contains(basePath);
} catch (SysException e) {
throw e;
}
}
}
-服务等级
@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {
@Autowired
private WebServiceDAO webServiceDAO;
@Override
@Transactional
public List<WebService> getWebService(Set<String> roles, String method) throws DataAccessException {
return webServiceDAO.getWebServices(roles, method);
}
}
@存储库 公共(public)类 WebServiceDAOImpl 扩展 BaseDAOImpl 实现 WebServiceDAO {
private static Logger log = LoggerFactory.getLogger(WebServiceDAOImpl.class);
@Override
public List<WebService> getWebServices(Set<String> roles, String methodType) throws DataAccessException {
TypedQuery<WebService> query = null;
try {
Session session = getSessionFromSessionFactory(getSessionFactory());
StringBuilder sqlString = new StringBuilder("select ws.* from WEB_SERVICE_PERMISSION_MAP wpm "+
"join WEB_SERVICE ws on ws.ID = wpm.WEB_SERVICE_ID "+
"join WEB_SERVICE_METHOD wsm on wsm.ID = wpm.WEB_SERVICE_METHOD_ID "+
"where wpm.PERMISSION_ID in "+
"(select pe.id from ROLE_PERMISSION rope "+
"inner join Permission pe on rope.PERMISSIONID = pe.id "+
"inner join Role ro on rope.ROLEID = ro.ID "+
"where ro.name in (:roles)) and "+
"wsm.NAME in (:method)");
query = session.createNativeQuery(sqlString.toString(), WebService.class);
query.setParameter("roles", roles);
query.setParameter("method", methodType);
} catch (Exception e) {
log.error("Error occured in WebServiceDAOImpl.getWebServices method while getting web services for roles : "+roles+" and request method type : "+methodType, e);
throw new DataAccessException("Error occured in WebServiceDAOImpl.getWebServices method while getting web services for roles : "+roles+" and request method type : "+methodType, e);
}
return query.getResultList();
}
}
-Base DAO
public class BaseDAOImpl<T> implements BaseDAO<T> {
@Autowired
private SessionFactory sessionFactory;
private Session session;
private Class<T> domainClass;
public Session getSessionFromSessionFactory(SessionFactory sessionFactory) {
try {
session = sessionFactory.getCurrentSession();
} catch (HibernateException he) {
log.error("Error in getSessionFromSessionFactory :" + he.getStackTrace());
}
return session;
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public Session getSession() {
return session;
}
public void setSession(Session session) {
this.session = session;
}
}
最佳答案
问题已解决。这是我的错,因为我在类级别创建了 session 对象。并且 session 对象在线程之间共享。
关于java - 连续的服务器请求导致 hibernate 异常问题, session 的不安全使用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47305687/