问题描述
typeExceptionreportmessagedescriptionTheserverencounteredaninternalerror()thatpreventeditfromfulfillingthisrequest.exceptionorg.apache.jasper.JasperException:AnexceptionoccurredprocessingJSPpage/login.jspatline1310:"username='"+username+"'andpassword='"+password+"'";11:ResultSetrs=rst.getResult(str);//执行SQL语句获得结果集对象12:session.setAttribute("isLog",newString("0"));//判断用户是否登录，当isLog的属性为0时，说明用户并没有登录13:if(!rs.next())//结果集没有找到所要查找的行14:{15:out.println("<scriptlanguage='javascript'>alert('用户名或密码错误');"+16:"parent.location.href='index.jsp';</script>");Stacktrace:org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)rootcausejava.lang.NullPointerExceptionorg.apache.jsp.login_jsp._jspService(login_jsp.java:85)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)noteThefullstacktraceoftherootcauseisavailableintheApacheTomcat/6.0.18logs.给位大侠帮忙看看啊，，我是在光盘中考下来的系统啊
解决方案
解决方案二：
NullPointerExceptionlogin.jspatline13翻译成中文你就知道了