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在实现OA的时候，遇到了这样的错误：
java.lang.NullPointerException
atorg.apache.struts2.components.IteratorComponent$CounterIterator.<init>(IteratorComponent.java:367)
atorg.apache.struts2.components.IteratorComponent.start(IteratorComponent.java:279)
atorg.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:53)
atorg.apache.jsp.WEB_002dINF.jsp.forumAction.show_jsp._jspx_meth_s_005fiterator_005f2(show_jsp.java:769)
atorg.apache.jsp.WEB_002dINF.jsp.forumAction.show_jsp._jspService(show_jsp.java:197)
atorg.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
atorg.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
atorg.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
atjavax.servlet.http.HttpServlet.service(HttpServlet.java:803)
atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
atorg.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
atorg.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
atorg.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
atorg.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
atorg.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154)
atorg.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
atcom.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
atcom.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
atcom.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
atorg.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
断点调试之后，发现后台有数据，但是前台页面死活报这个错误，前前后后看了很久，才发现原因是我自己给自己挖了个坑，由于参数类型不一致，导致的。留下记录博客一篇，警醒自己。
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