SSH项目，failed to lazily initialize a collection of role

错误：

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.zua.bos.domain.Staff.decidedzones, could not initialize proxy - no Sessionat org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:567)at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:205)at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:546)at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:133)at org.hibernate.collection.internal.PersistentSet.toString(PersistentSet.java:299)at java.lang.String.valueOf(String.java:2854)at java.lang.StringBuilder.append(StringBuilder.java:128)at com.zua.bos.domain.Staff.toString(Staff.java:116)at java.lang.String.valueOf(String.java:2854)at java.lang.StringBuilder.append(StringBuilder.java:128)at java.util.AbstractCollection.toString(AbstractCollection.java:450)at java.lang.String.valueOf(String.java:2854)at java.lang.StringBuilder.append(StringBuilder.java:128)at com.zua.bos.utils.PageBean.toString(PageBean.java:54)at com.zua.bos.web.action.StaffAction.pageQuery(StaffAction.java:67)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:601)at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)at ognl.ASTMethod.getValueBody(ASTMethod.java:90)at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)at ognl.SimpleNode.getValue(SimpleNode.java:258)at ognl.Ognl.getValue(Ognl.java:494)at ognl.Ognl.getValue(Ognl.java:458)at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at com.zua.bos.web.interceptor.LoginInterceptor.doIntercept(LoginInterceptor.java:35)at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:722)

今天在做ssh项目时遇到这个错误，说的很清晰，是因为hibernate懒加载的问题

原因：

是因为我的实体类里面维护了一个List集合对象，是一对多的关系，代码如下：

public class PageBean {/*** 查询传到后台的数据参数*/private int curPage;//当前页private int pageSize;//每页显示的记录数private DetachedCriteria detachedCriteria;//离线查询条件/*** 查询后返回给前台的数据*/private int total;//总记录数private List rows;//当前页需要展示的数据集合//省略getter,setter}

这样的话，获取PageBean对象时，PageBean对象关联List集合对象，FetchType默认是懒加载的，当获取list对象时，session已经关闭；

但是如果PageBean维护的知识一个简单的Pojo，FetchType默认是立即加载。

解决方法：

在web.xml中配置过滤器，延长Sesseion的生命周期

  <!-- 配置过滤器，解决hibernate延迟加载问题 --><filter><filter-name>openSessionInView</filter-name><filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class></filter><filter-mapping><filter-name>openSessionInView</filter-name><url-pattern>/*</url-pattern></filter-mapping>

注意：此过滤器要放在struts2的过滤器的前面，过滤器是有执行顺序的！

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SSH项目，failed to lazily initialize a collection of role

错误：

原因：

解决方法：

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