LazyInitializationException即使与OpenEntityManagerInViewFilter

Question

我想使用OpenEntityManageInViewFilter，但我一直有LazyInitializationException。人们在EntityManager初始化两次时遇到了类似的问题 - 但这似乎不是我的情况。在我可以看到的例外日志中，Filter正确地启动。

的web.xml：

<web-app version="2.4" 
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation=" 
     http://java.sun.com/xml/ns/j2ee 
     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 

    <servlet> 
     <servlet-name>web-application</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 

    <servlet-mapping> 
     <servlet-name>web-application</servlet-name> 
     <url-pattern>/*</url-pattern> 
    </servlet-mapping> 

    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>WEB-INF/web-application-servlet.xml</param-value> 
    </context-param> 

    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 

    <filter> 
     <filter-name>openEntityManageInViewFilter</filter-name> 
     <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class> 
    </filter> 

    <filter-mapping> 
     <filter-name>openEntityManageInViewFilter</filter-name> 
     <url-pattern>/*</url-pattern> 
    </filter-mapping> 

</web-app> 

Web的应用程序servlet.xml中

<beans xmlns="http://www.springframework.org/schema/beans" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans 
      http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
      http://www.springframework.org/schema/context 
      http://www.springframework.org/schema/context/spring-context-3.1.xsd 
      http://www.springframework.org/schema/tx 
      http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> 

    <import resource="classpath:applicationContext.xml"/> 
    <context:property-placeholder location="classpath:application.properties"/> 

    <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> 
     <property name="viewNames" value="*" /> 
     <property name="cache" value="false"/> 
     <property name="prefix" value=""/> 
     <property name="suffix" value=".ftl"/> 
     <property name="exposeSpringMacroHelpers" value="false"/> 
    </bean> 

    <bean id="handlerAdapter" autowire="byType" class="org.maite.controller.router.HandlerAdapter" /> 
    <bean id="handlerMapping" autowire="byType" class="org.maite.controller.router.HandlerMapping" /> 
</beans> 

的applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans 
      http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
      http://www.springframework.org/schema/context 
      http://www.springframework.org/schema/context/spring-context-3.1.xsd 
      http://www.springframework.org/schema/tx 
      http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> 


    <tx:annotation-driven /> 
    <context:annotation-config/> 
    <context:spring-configured/> 

    <bean id="entityManagerFactory" 
      class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="persistenceUnitName" value="persistenceUnit"/> 
    </bean> 

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" /> 
</beans> 

和异常（你可以看到OpenEntityManagerInView需要部分堆栈跟踪）：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.goout.model.Event.schedule, no session or session was closed 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894) 
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
root cause 

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.goout.model.Event.schedule, no session or session was closed 
    org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393) 
    org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:385) 
    org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:378) 
    org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:112) 
    org.hibernate.collection.internal.PersistentSet.toArray(PersistentSet.java:188) 
    java.util.ArrayList.<init>(ArrayList.java:151) 
    freemarker.template.SimpleSequence.<init>(SimpleSequence.java:162) 
    freemarker.template.DefaultObjectWrapper.wrap(DefaultObjectWrapper.java:117) 
    freemarker.template.WrappingTemplateModel.wrap(WrappingTemplateModel.java:134) 
    freemarker.template.SimpleHash.get(SimpleHash.java:224) 
    freemarker.core.Dot._getAsTemplateModel(Dot.java:76) 
    freemarker.core.Expression.getAsTemplateModel(Expression.java:89) 
    freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) 
    freemarker.core.Environment.visit(Environment.java:221) 
    freemarker.core.MixedContent.accept(MixedContent.java:92) 
    freemarker.core.Environment.visit(Environment.java:221) 
    freemarker.core.Environment.visit(Environment.java:310) 
    freemarker.core.BlockAssignment.accept(BlockAssignment.java:83) 
    freemarker.core.Environment.visit(Environment.java:221) 
    freemarker.core.MixedContent.accept(MixedContent.java:92) 
    freemarker.core.Environment.visit(Environment.java:221) 
    freemarker.core.Environment.process(Environment.java:199) 
    freemarker.template.Template.process(Template.java:237) 
    org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366) 
    org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283) 
    org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233) 
    org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167) 
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) 
    org.maite.DispatcherServlet.doService(DispatcherServlet.java:38) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 

Answer 1

你必须在this question描述的，这意味着你有2种的EntityManager豆同样的问题 - 这是造成混乱。

基本上你需要删除

<import resource="classpath:applicationContext.xml"/> 

从web-application-context.ml，分区您的豆，使得网络层和应用豆在不同的上下文文件，并确保您的组件扫描每个拿起正确的豆子。这可能需要将类移动到不同的包中，如果没有关于项目结构的更多信息，很难提供建议。

最后引用来自web.xml的两个上下文

Answer 2

您能否提供您的DAO类，它无法初始化另一个DAO类的集合？

尝试将这些参数放入过滤器中的web.xml中。

<init-param> 
     <param-name>entityManagerFactoryBeanName</param-name> 
     <param-value>entityManagerFactory</param-value> 
</init-param>