hibernate - 使用 Spring Boot 和数据 JPA，尽管有 OpenSesionInViewFilter ，但仍然获得 LazyInitializationException

Question

我正在使用带有 Spring Boot 的挂毯 5，使用这个很棒的小库:https://github.com/code8/tapestry-boot

然而，尽管我使用了 OpenSesionInViewFilter，但我还是收到了臭名昭著的 LazyInitializationException。撇开 OpenSesionInViewFilter 的优缺点不谈，我想在移植大型遗留应用程序时将其与 OpenSesionInViewFilter 一起使用。

我的 Spring 启动配置是

@SpringBootApplication
public class Launcher {
    public static void main(String[] args) {
        new SpringApplicationBuilder(Launcher.class)
                .web(true)
                .run(args);
    }
    @Bean
    public HibernateJpaSessionFactoryBean sessionFactory() {
        return new HibernateJpaSessionFactoryBean();
    }

    @Bean
    public FilterRegistrationBean registerOpenSessionInViewFilterBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        OpenSessionInViewFilter filter = new OpenSessionInViewFilter();
        registrationBean.setFilter(filter);
        registrationBean.setOrder(5);
        return registrationBean;
    }
}

我确保在 TapestryFilter 之前加载 OpenSessionInViewFilter，并通过启动时的 spring 输出验证了这一点。我将tapestry-boot 库编辑为TapestryFilter 上的setOrder(10)。

我还通过调试验证了 OpenSessionInViewFilter 实际上正在创建一个 session 。

在下面 LIE 的示例堆栈跟踪中，您可以看到正在使用 OpenSessionInViewFilter。

我有 2 个级别的服务层:

Tapestry Pages --> XXManagerImpl (e.g, UserManager) --> JpaRepository

我的 Manager 服务注释如下:

@Service
@Transactional(propagation = Propagation.REQUIRED)
public class UserManagerImpl implements UserManager, Serializable

我的 JpaRepositories 没有用 @Transactional 或 @Repository 注释(以防万一)。

初始数据访问按预期工作，但是当我尝试访问 Lazy 初始化字段时，我得到了 LIE。

根异常:

Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:147) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:260) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
    at org.mypackage.model.submodel.othermodel$$_jvstde5_1.getName(OtherModel$$_jvstde5_1.java) ~[main/:na]
    at $InternalPropertyConduit_97875b5f2687.get(Unknown Source) ~[na:na]
    at org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:63) ~[tapestry-core-5.4.1.jar:na]

示例堆栈跟踪:

org.apache.tapestry5.ioc.internal.OperationException: Render queue error in Expansion[PropBinding[expansion mypage/Edit(model.othermodel.name)]]: could not initialize proxy - no Session
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:186) ~[tapestry-ioc-5.4.1.jar:na]
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationTrackerImpl.java:62) ~[tapestry-ioc-5.4.1.jar:na]
    at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerThreadOperationTracker.java:60) ~[tapestry-ioc-5.4.1.jar:na]
    at org.apache.tapestry5.ioc.internal.RegistryImpl.run(RegistryImpl.java:1254) ~[tapestry-ioc-5.4.1.jar:na]
    at org.apache.tapestry5.internal.services.RequestOperationTracker.handlePageRender(RequestOperationTracker.java:66) ~[tapestry-core-5.4.1.jar:na]
    at $ComponentRequestHandler_94ac265764f4.handlePageRendewn Source) ~[na:na]
    at $ComponentRequestHandler_94ac2657642d.handlePageRender(Unknown Source) ~[na:na]
    at org.apache.tapestry5.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:55) ~[tapestry-core-5.4.1.jar:na]
    at $Dispatcher_94ac265764c8.dispatch(Unknown Source) ~[na:na]
    at $Dispatcher_94ac26576473.dispatch(Unknown Source) ~[na:na]
    at org.apache.tapestry5.modules.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:305) ~[tapestry-core-5.4.1.jar:na]
    at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26) ~[tapestry-core-5.4.1.jar:na]
    at $RequestHandler_94ac265764c7.service(Unknown Source) [na:na]
    at org.apache.tapestry5.modules.TapestryModule$3.service(TapestryModule.java:846) [tapestry-core-5.4.1.jar:na]
    at $RequestHandler_94ac265764c7.service(Unknown Source) [na:na]
    at org.apache.tapestry5.modules.TapestryModule$2.service(TapestryModule.java:836) [tapestry-core-5.4.1.jar:na]
    at $RequestHandler_94ac265764c7.service(Unknown Source) [na:na]
    at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:89) [tapestry-core-5.4.1.jar:na]
    at $RequestHandler_94ac265764c7.service(Unknown Source) [na:na]
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:105) [tapestry-core-5.4.1.jar:na]
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:95) [tapestry-core-5.4.1.jar:na]
    at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:83) [tapestry-ioc-5.4.1.jar:na]
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:119) [tapestry-core-5.4.1.jar:na]
    at $RequestHandler_94ac265764c7.service(Unknown Source) [na:na]
    at $RequestHandler_94ac2657649d.service(Unknown Source) [na:na]
    at org.apache.tapestry5.modules.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:256) [tapestry-core-5.4.1.jar:na]
    apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:45) [tapestry-upload-5.4.1.jar:na]
    at $HttpServletRequestHandler_94ac265764c4.service(Unknown Source) [na:na]
    at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:59) [tapestry-core-5.4.1.jar:na]
    at $HttpServletRequestHandler_94ac265764c4.service(Unknown Source) [na:na]
    at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62) [tapestry-core-5.4.1.jar:na]
    at $HttpServletRequestFilter_94ac2657645a.service(Unknown Source) [na:na]
    at $HttpServletRequestHandler_94ac265764c4.service(Unknown Source) [na:na]
    at org.apache.tapestry5.modules.TapestryModule$1.service(TapestryModule.java:796) [tapestry-core-5.4.1.jar:na]
    at $HttpServletRequestHandler_94ac265764c4.service(Unknown Source) [na:na]
    at $HttpServletRequestHandler_94ac26576458.service(Unknown Source) [na:na]
    at info.code8.tapestry.TapestryFilter.doFilter(TapestryFilter.java:49) [tapestry-boot-0.1.0-SNAPSHOT.jar:na]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [tomcat-embed-core-8.0.32.jar:8.0.32]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [tomcat-embed-core-8.0.32.jar:8.0.32]
    at org.springframework.orm.hibernate5.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151) [spring-orm-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [tomcat-embed-core-8.0.32.jar:8.0.32]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

库版本:

   tapestry           : 5.4.1
   hibernate          : hibernate-core-5.1.0.Final
   spring framework   : 4.2.5.RELEASE
   spring-boot        : 1.3.3.RELEASE
   spring-data-jpa    : 1.10.1.RELEASE   // for  querydsl 4 support
   spring-data-commons: 1.12.1.RELEASE   // for  querydsl 4 support

Answer 1

OpenSessionInViewFilter用于普通 Hibernate API。而OpenEntityManagerInViewFilter用于 JPA api(也适用于其他 JPA 提供程序)。

要解决您的问题，请为您使用的技术使用适当的过滤器，在您的情况下是 OpenEntityManagerInViewFilter .