高分求救的白痴有关问题
日期：2014-05-18 浏览次数：20636 次
高分求救的白痴问题
刚开始接触JSP，却要搞定一台重装的机器，需要将JSP配置好，现在搞不定了。
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=utf-8 ">
<%@ page contentType= "text/html;charset=utf-8 "%>
<jsp:useBean id= "DBbean " scope= "page " class= "Datebase.DatabaseBean "/>
<jsp:useBean id= "SQLbean " scope= "page " class= "Datebase.RunSql "/>
<%@ page language= "java " import= "java.net.* " %>
<%@ page language= "java " import= "java.sql.* " %>
会报这样的错误
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
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)
root cause
java.lang.NullPointerException
Datebase.DatabaseBean.executeQuery(DatabaseBean.java:43)
org.apache.jsp.cmb.carcard.bbs_jsp._jspService(org.apache.jsp.cmb.carcard.bbs_jsp:107)
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:332)
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)
我基本上对如何设置JSP是文盲，请高手能详细指点，或者告诉我相关教程的网址，多多拜谢！
------解决方案--------------------
不带 <jsp:useBean id= "DBbean " scope= "page " class= "Datebase.DatabaseBean "/>
<jsp:useBean id= "SQLbean " scope= "page " class= "Datebase.RunSql "/> 这样的语句的JSP则能正常运行。
------解决方案--------------------
数据库出错
------解决方案--------------------
java.lang.NullPointerException
一个对空指针的引用错误
开看页面有有没有写java语句
------解决方案--------------------
创建两个bean其中之一的时候出错了，去那里面找
------解决方案--------------------
楼主你把页面的代码贴全了先，另外你去找本学jsp的书看看
------解决方案--------------------
java.lang.NullPointerException
Datebase.DatabaseBean.executeQuery(DatabaseBean.java:43)
空指针异常 连接数据库的问题
------解决方案-------------
刚开始接触JSP，却要搞定一台重装的机器，需要将JSP配置好，现在搞不定了。
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=utf-8 ">
<%@ page contentType= "text/html;charset=utf-8 "%>
<jsp:useBean id= "DBbean " scope= "page " class= "Datebase.DatabaseBean "/>
<jsp:useBean id= "SQLbean " scope= "page " class= "Datebase.RunSql "/>
<%@ page language= "java " import= "java.net.* " %>
<%@ page language= "java " import= "java.sql.* " %>
会报这样的错误
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
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)
root cause
java.lang.NullPointerException
Datebase.DatabaseBean.executeQuery(DatabaseBean.java:43)
org.apache.jsp.cmb.carcard.bbs_jsp._jspService(org.apache.jsp.cmb.carcard.bbs_jsp:107)
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:332)
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)
我基本上对如何设置JSP是文盲，请高手能详细指点，或者告诉我相关教程的网址，多多拜谢！
------解决方案--------------------
不带 <jsp:useBean id= "DBbean " scope= "page " class= "Datebase.DatabaseBean "/>
<jsp:useBean id= "SQLbean " scope= "page " class= "Datebase.RunSql "/> 这样的语句的JSP则能正常运行。
------解决方案--------------------
数据库出错
------解决方案--------------------
java.lang.NullPointerException
一个对空指针的引用错误
开看页面有有没有写java语句
------解决方案--------------------
创建两个bean其中之一的时候出错了，去那里面找
------解决方案--------------------
楼主你把页面的代码贴全了先，另外你去找本学jsp的书看看
------解决方案--------------------
java.lang.NullPointerException
Datebase.DatabaseBean.executeQuery(DatabaseBean.java:43)
空指针异常 连接数据库的问题
------解决方案-------------
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