服务器遇到一个意外的情况，阻止它完成请求

[sharp梁]

HTTP Status 500 – Internal Server Error


Type 异常报告

消息 在 [16] 行处理 [reader/index.jsp] 时发生异常

描述 服务器遇到一个意外的情况，阻止它完成请求。

Exception
org.apache.jasper.JasperException: 在 [16] 行处理 [reader/index.jsp] 时发生异常

13: /* List<NovelInfo>list=novel.getList(null); */
14: Genre genre=new Genre();
15: String keyword=request.getParameter("keyword");
16: List<NovelInfo> list=novel.getList(keyword);
17: List<GenreInfo> clist=genre.getList();
18:
19: %>


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:625)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514)
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:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)


Root Cause
java.lang.NullPointerException
org.dal.Novel.getList(Novel.java:32)
org.apache.jsp.reader.index_jsp._jspService(index_jsp.java:140)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
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:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)




到底是哪里出问题了啊，半个月前还能运行，每天都在运行，这几天就出现这个问题了，大佬们帮忙看看吧

[sharp梁]

package org.common; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class Conn { Connection conn=null; Statement stmt=null; ResultSet rs=null; public Conn(){ try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * @param sql * @return */ public ResultSet executeQuery(String sql){ try{ conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/novel?useUnicode=true&characterEncoding=utf-8;zeroDateTimeBehavior=convertToNull","root","123456"); stmt=conn.createStatement(); rs=stmt.executeQuery(sql); }catch(SQLException e){ e.printStackTrace(); } return rs; } /** * @param sql * @return */ public int executeUpdate(String sql){ int result=0; try { conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/novel?useUnicode=true&characterEncoding=utf-8;zeroDateTimeBehavior=convertToNull","root","123456"); stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); result=stmt.executeUpdate(sql); } catch (SQLException e) { // TODO Auto-generated catch block result=0; } return result; } public void close(){ if(rs!=null) try { rs.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(stmt!=null) try { stmt.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(conn!=null) try { conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 连接数据库，rs为空该怎么改

[weixin_50958232]

网络出错纠正

[大然然]

查看List<NovelInfo> list=novel.getList(keyword); keyword是否为null

[Coisini ]

请问一下你最后怎么解决的，我也遇到了这个问题

[yangshenぉ┰]

我也遇到了，又解决了的吗