即使使用OpenEntityManagerInViewFilter，也可以使用LazyInitializationException
即使使用OpenEntityManagerInViewFilter，也可以使用LazyInitializationException
提问于 2012-03-07 16:18:02
我正在尝试使用OpenEntityManageInViewFilter，但我一直在使用LazyInitializationException。当EntityManager初始化两次时，人们也遇到了类似的问题--但这似乎不是我的情况。在异常日志中，我可以看到筛选器正在正确触发。
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-application-servlet.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">
<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>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>还有一个异常(您可以看到OpenEntityManagerInView是堆栈跟踪的一部分)：
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)回答 2
Stack Overflow用户
回答已采纳
发布于 2012-03-15 01:15:02
您遇到了与this question中描述的问题相同的问题，这意味着您有两个EntityManager beans这导致了混乱。
基本上，您需要删除
<import resource="classpath:applicationContext.xml"/>在web-application-context.ml中，对beans进行分区，使web层beans和应用程序beans位于单独的上下文文件中，并确保您的组件扫描每个beans时都会选取正确的beans。这可能需要将类移动到不同的包中，如果没有更多关于项目结构的信息，很难给出建议。
最后，从web.xml引用这两个上下文
Stack Overflow用户
发布于 2012-03-14 02:28:00
您能否提供您的DAO类无法初始化另一个DAO类的集合？
尝试将这些参数放入web.xml in过滤器中。
<init-param>
<param-name>entityManagerFactoryBeanName</param-name>
<param-value>entityManagerFactory</param-value>
</init-param>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9597918
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