spring- could not initialize proxy - no Session

DEBUG - Using SessionFactory 'sessionFactory' for OpenSessionInViewFilter
DEBUG - Returning cached instance of singleton bean 'sessionFactory'
DEBUG - Opening single Hibernate Session in OpenSessionInViewFilter
DEBUG - Opening Hibernate Session
DEBUG - opened session at timestamp: 13443286677
DEBUG - Entering nullPropertyValue [target=[com.opensymphony.xwork2.DefaultTextProvider@a42cc9], property=struts]
DEBUG - Entering nullPropertyValue [target=[com.opensymphony.xwork2.DefaultTextProvider@a42cc9], property=struts]
DEBUG - Creating an DefaultActionProxy for namespace / and action name perClaimVouchers
DEBUG - Returning cached instance of singleton bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0'
DEBUG - Returning cached instance of singleton bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0'
DEBUG - Returning cached instance of singleton bean 'claimVoucherBiz'
DEBUG - Added autowiring by name from bean name 'org.kara.action.ClaimVoucherAction' via property 'claimVoucherBiz' to bean named 'claimVoucherBiz'
DEBUG - Returning cached instance of singleton bean 'departmentBiz'
DEBUG - Added autowiring by name from bean name 'org.kara.action.ClaimVoucherAction' via property 'departmentBiz' to bean named 'departmentBiz'
DEBUG - Returning cached instance of singleton bean 'employeeBiz'
DEBUG - Added autowiring by name from bean name 'org.kara.action.ClaimVoucherAction' via property 'employeeBiz' to bean named 'employeeBiz'
DEBUG - Returning cached instance of singleton bean 'positionBiz'
DEBUG - Added autowiring by name from bean name 'org.kara.action.ClaimVoucherAction' via property 'positionBiz' to bean named 'positionBiz'
DEBUG - intercept '//perClaimVouchers' { 
DEBUG - applied invocation context locale=en_GB
DEBUG - Entering nullPropertyValue [target=[proxyTargetClass=false; optimize=false; opaque=false; exposeProxy=false; frozen=false, com.opensymphony.xwork2.DefaultTextProvider@a42cc9], property=locale]
DEBUG - before Locale=null
DEBUG - Entering nullPropertyValue [target=[proxyTargetClass=false; optimize=false; opaque=false; exposeProxy=false; frozen=false, com.opensymphony.xwork2.DefaultTextProvider@a42cc9], property=struts]
DEBUG - Bypassing //perClaimVouchers
DEBUG - Setting static parameters {}
DEBUG - Setting params NONE
DEBUG - Setting params 
DEBUG - Validating //perClaimVouchers with method searchClaimVouchers.
DEBUG - Executing action method = searchClaimVouchers
ERROR - could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:132)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:174)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
at org.kara.entity.SysPosition_$$_javassist_1.getNameCn(SysPosition_$$_javassist_1.java)
at org.kara.action.ClaimVoucherAction.getPosition(ClaimVoucherAction.java:94)
at org.kara.action.ClaimVoucherAction.searchClaimVouchers(ClaimVoucherAction.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
DEBUG - Closing single Hibernate Session in OpenSessionInViewFilter
DEBUG - Closing Hibernate Session调用方法时老报这个错，特别纠结。您能提供点建议么？谢谢！期待您能快些回复....... 急！急！急！