下面问题除了空指针，还有没有其他错误，怎么改

Question

错误：
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage 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
com.zk.SplitPage.initialize(SplitPage.java:14)
org.apache.jsp.search_005ffriend_005fresult_jsp._jspService(search_005ffriend_005fresult_jsp.java:101)，，//我的101行是：
SplitPage.initialize(rs,10);这个问题是不是解决了空指针就没事了？
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)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.5.17
SplitPage.initialize方法的构建：
public void initialize(ResultSet rs,int pageSize)
   {this.pageSize=pageSize;
    try
      {this.rs=rs;
       this.rsmd=this.rs.getMetaData();
       if(this.rs!=null)
         {this.rs.last();
          this.rowCount=this.rs.getRow();
          this.rs.first();
          this.PageCount=(this.rowCount-1)/this.pageSize+1;
         }
       else
        this.rowCount=0;
      }
    catch(SQLException e)
      {System.out.println(e.toString());
      }
   }

Answer 1

SplitPage.java:14应该是第14行的问题！

Answer 2

13:this.rs=rs;
14:       this.rsmd=this.rs.getMetaData();
15:       if(this.rs!=null)

Answer 3

你的 rs 肯的定是 null 的 。
你在你 传入的参数那里调试。
错误没有在这里。 是你传入的 ResultSet 为 null

Answer 4

 if(this.rs!=null)
         {this.rs.last();
或许rs不是null而是没有next

Answer 5

public void initialize(ResultSet rs,int pageSize) 
   {this.pageSize=pageSize; 
    try
      {
if(rs!=null){
this.rs=rs; 
       this.rsmd=this.rs.getMetaData(); 
       if(this.rs!=null) 
         {this.rs.last(); 
          this.rowCount=this.rs.getRow(); 
          this.rs.first(); 
          this.PageCount=(this.rowCount-1)/this.pageSize+1; 
         } 
       else 
        this.rowCount=0; 
      } }
    catch(SQLException e) 
      {System.out.println(e.toString()); 
      } 
   }

Answer 6

就是说rs.next()为空 你可以这样写if(this.rs.next()!=null)