无法找到实体BEAN里的departmentid里的值

javax.servlet.ServletException: Unable to find a value for "departmentId" in object of class "employeeBean.Departmentinfo" using operator "."
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
org.apache.jsp.showdepartment_jsp._jspService(org.apache.jsp.showdepartment_jsp:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
employeeControl.Control.doPost(Control.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
employeeFilter.Allfilter.doFilter(Allfilter.java:20)
root cause javax.servlet.jsp.el.ELException: Unable to find a value for "departmentId" in object of class "employeeBean.Departmentinfo" using operator "."
org.apache.commons.el.Logger.logError(Logger.java:481)
org.apache.commons.el.Logger.logError(Logger.java:498)
org.apache.commons.el.Logger.logError(Logger.java:611)
org.apache.commons.el.ArraySuffix.evaluate(ArraySuffix.java:340)
org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145)
org.apache.commons.el.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:263)
org.apache.commons.el.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:190)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:922)
org.apache.jsp.showdepartment_jsp._jspx_meth_c_forEach_0(org.apache.jsp.showdepartment_jsp:118)
org.apache.jsp.showdepartment_jsp._jspService(org.apache.jsp.showdepartment_jsp:81)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
employeeControl.Control.doPost(Control.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
employeeFilter.Allfilter.doFilter(Allfilter.java:20)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.12 logs.
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上面的是错误提示,气死俺了,中央控制器执行到页面跳转的时候居然给我报这个错,最可恶的是如果没有查询到我要的东西的话,居然能能正常跳转,大家来看看怎么回事情