从svn考到笔记本上报错，考到另一台式电脑不报错，笔记本重启、新建eclipse工作环境、配置还是出现以下问题，不知道原因，是不是电脑问题？哪位大佬解决下？
严重: Servlet.service() for servlet [springMvc] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at com.dimple.service.impl.ExamServiceImpl.findExamListToReview(ExamServiceImpl.java:291)
at com.dimple.controller.TeacherReviewController.list(TeacherReviewController.java:52)
at com.dimple.controller.TeacherReviewController$$FastClassBySpringCGLIB$$12c2b524.invoke()
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
at com.dimple.controller.TeacherReviewController$$EnhancerBySpringCGLIB$$3b3224b4.list()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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