tomcat 6 发布应用后,访问jsp报错org.apache.jasper.JasperException: java.lang.NullPointerException的解决办法。

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:416)
org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)

Apache Software Foundation/Tomcat6.0/webapps/你的工程/WEB-INF/lib下面看有没有servlet-api.jar、jsp-api.jar 等在Apache Software Foundation/Tomcat6.0/lib 下面已经存在的jar包, 如果有则删除。重启后,问题解决。

org.apache.jasper.JasperException: 在 [16] 行处理 [/registration_action.jsp] 时发生异常 13: String yonghuming = request.getParameter("username"); 14: String yonghumima = request.getParameter("password"); 15: Connection conn = DBUtil.getConnection(); 16: System.out.println(conn.isClosed()); 17: String sql = "INSERT INTO account(name, pass) VALUES(?, ?)"; 18: PreparedStatement pstmt = conn.prepareStatement(sql); 19: pstmt.setString(1, yonghuming); Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:599) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:488) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) 根本原因。 java.lang.NullPointerException: Cannot invoke "java.sql.Connection.isClosed()" because "conn" is null org.apache.jsp.registration_005faction_jsp._jspService(registration_005faction_jsp.java:142) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:456) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51
05-30
org.apache.jasper.JasperException: 在 [69] 行处理 [/teacher/teacher_teaching.jsp] 时发生异常 66: <th field="credit" formatter="getCredit">课程学分</th> 67: </tr> 68: <%String username = session.getAttribute("username").toString(); 69: teacheraction te=new teacheraction(username);ResultSet rs =te.getaresult(); while(rs.next()) { %> 70: <tr> 71: <td><%= rs.getString("semester") %></td> 72: <td><%= rs.getString("course_name") %></td> Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:610) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327) javax.servlet.http.HttpServlet.service(HttpServlet.java:779) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) com.beacon.sms.filter.EncodingFilter.doFilter(EncodingFilter.java:27) 根本原因。 java.lang.NullPointerException org.apache.jsp.teacher.teacher_005fteaching_jsp._jspService(teacher_005fteaching_jsp.java:188) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:779) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327) javax.servlet.http.HttpServlet.service(HttpServlet.java:779) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) com.beacon.sms.filter.EncodingFilter.doFilter(EncodingFilter.java:27)
06-13
org.apache.jasper.JasperException: 在 [8] 行处理 [front/index.jsp] 时发生异常 5: <jsp:useBean id="conn" scope="page" class="com.tools.ConnDB" /> 6: <% 7: /* 最新上架商品信息 */ 8: ResultSet rs_new = conn.executeQuery("select t1.ID, t1.GoodsName,t1.price,t1.picture,t2.TypeName " 9: + "from tb_goods t1,tb_subType t2 where t1.typeID=t2.ID and " 10: + "t1.newGoods=1 order by t1.INTime desc limit 12");//查询最新上架商品信息 11: int new_ID = 0;//保存最新上架商品ID的变量 Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:584) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:475) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:356) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:307) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) 根本原因。 java.lang.NullPointerException: Cannot invoke "java.sql.Connection.createStatement(int, int)" because "this.conn" is null com.tools.ConnDB.executeQuery(ConnDB.java:68) org.apache.jsp.front.index_jsp._jspService(index_jsp.java:140) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:64) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:446) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:356) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:307) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ):注意 主要问题的全部 stack 信息可以在 server logs 里查看
最新发布
08-12
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