UC知道tomcat HTTP Status 500的问题！
来源：百度知道 编辑：UC知道 时间：2024/05/17 14:55:23
目前我的电脑里装有jdk1.6 eclipse3.2 Myeclipse5.5A
tomcat-6.0.14 我在Myeclipse5.5A中导入JSP网页 启动TOMCAT服务都没问题
http://localhost:8080/也能打开
但是加上工程名字就出现
tomcat HTTP Status 500错误
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /show.jsp at line 37
34: <th>操作</th>
35: </tr>
36: <%
37: List<LiuYan> list = new LiuYanDao().select();
38: for(int i=0;i<list.size();i++){
39: LiuYan ly = list.get(i);
40: out.println("<tr><td><input type='checkbox' size='20' name='check' value="+ly.getId()+"></td>");
Stacktrace:
org.apache
tomcat-6.0.14 我在Myeclipse5.5A中导入JSP网页 启动TOMCAT服务都没问题
http://localhost:8080/也能打开
但是加上工程名字就出现
tomcat HTTP Status 500错误
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /show.jsp at line 37
34: <th>操作</th>
35: </tr>
36: <%
37: List<LiuYan> list = new LiuYanDao().select();
38: for(int i=0;i<list.size();i++){
39: LiuYan ly = list.get(i);
40: out.println("<tr><td><input type='checkbox' size='20' name='check' value="+ly.getId()+"></td>");
Stacktrace:
org.apache
java.lang.NullPointerException
dao.LiuYanDao.select(LiuYanDao.java:55)
new LiuYanDao().select();
这个类的LiuYanDao的这个方法里有空指针异常
空指针异常 看看你得类dao.LiuYanDao.select 的第55行
我出这个错误一般是因为没有连上数据库 看数据库打开没？