程序如下:
<%
List<Emp> list=new EmpDao().findAll();
for (Emp emp : list) {
out.print(emp.getEmpno()+" "+emp.getEname()+" "+emp.getHireDate()+" "+emp.getSal()+"<br/>");
}
%>
显示异常:
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 35
32: response.addCookie(c1);
33: response.addCookie(c2);
34: response.sendRedirect("cookie.jsp"); */
35: List<Emp> list=new EmpDao().findAll();
36: for (Emp emp : list) {
37: out.print(emp.getEmpno()+" "+emp.getEname()+" "+emp.getHireDate()+" "+emp.getSal()+"<br/>");
38: }
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:588)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
root cause
java.lang.NullPointerException
dao.BaseDao.excuteFind(BaseDao.java:23)
dao.EmpDao.findAll(EmpDao.java:14)
org.apache.jsp.index_jsp._jspService(index_jsp.java:153)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
检查无法获得连接,可是我用junit取得的连接是正常的,这怎么搞?
basedao程序
package cn.anywhere.dao;
import java.io.*;
import java.sql.*;
import java.util.Properties;
import java.sql.DriverManager;
import cn.anywhere.util.DatabaseConnection;
public class BaseDAO {
protected PreparedStatement pstmt = null;
protected ResultSet rs = null;
protected static Properties properties=null;
protected static Connection connection = null;
public ResultSet findAll(String sql){
try{
connection=DatabaseConnection.getConnection();
pstmt=connection.prepareStatement(sql);
rs=pstmt.executeQuery();
return rs;
} catch (SQLException e){
e.printStackTrace();
}
return rs;
}
}
显示的异常是connection异常.我怀疑是我的oracle jdbc文件没放对位置.因为java程序我在biuld path里加载oracle7.jar文件做连接.但是JSP程序的oracle jdbc文件应该放哪个目录?
我的项目目录结构是这样的