錯誤原因是什麼？菜鳥問題。請大家解答 謝謝

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.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause java.lang.NullPointerException
org.apache.jsp.TMP1icqpeyzi0_jsp._jspService(TMP1icqpeyzi0_jsp.java:75)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
--------------------------------------------------------------------------------Apache Tomcat/5.0.19

解决方案 »

  1.   

    java.lang.NullPointerException不是很清楚了吗？把你这个TMP1icqpeyzi.jsp的源代码贴出来。帮你看。
      

  2.   

    <jsp:useBean id="jb" scope="page" class="sqlserver.SqlServerBean"/>
    <body>
    <p> 
    <%
      String GuanLiNo = request.getParameter("GuanLiNo");
      String Projectname = request.getParameter("Projectname");
      String PartNo = request.getParameter("PartNo");
      
        session.getAttribute("GuanLiNo");
        session.getAttribute("Projectname");
        session.getAttribute("PartNo");
        
      String sql ;
      
      sql="select TOP 5* from PartPress where 1=1";
      if (GuanLiNo!= null & GuanLiNo.equals(""))
      sql = sql + "and GuanLiNo = '" + GuanLiNo+"'";
     
      if (Projectname != null & Projectname.equals(""))
      sql += sql + "and Projectname = '" + Projectname +"'";  if (PartNo != null & PartNo.equals(""))
      sql += sql + "and PartNo = '" + PartNo +"'";
      
      ResultSet rs = jb.query(sql);
      %>
    </p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p align="center"><font color="#000000" size="+2" face="華康相撲體">零件加工進度查詢</font></p>
    <div align="right"></div>
    <form name="form1">
      <div align="left"> 
        <table width="104%" border="0" cellpadding="0" cellspacing="0">
          <tr> 
            <td width="4%" nowrap><div align="center"><font color="#0000FF">工程名</font></div></td>
            <td width="4%" nowrap> <div align="center"> <font color="#0000FF"> 
                <select name="Projectname">
                  <option></option>
                  <option>MM</option>
                  <option>MC</option>
                  <option>MC3</option>
                  <option>EDM</option>
                  <option>WE</option>
                  <option>WH</option>
                  <option>MM2</option>
                  <option>MF</option>
                  <option>HT</option>
                </select>
                </font></div></td>
            <td width="5%" nowrap><div align="center"><font color="#0000FF">管理番號</font></div></td>
            <td width="13%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input name="GuanLiNo" type="text">
                </font></div></td>
            <td width="4%" nowrap><div align="center"><font color="#0000FF">零件號</font></div></td>
            <td width="13%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input type="text" name="PartNo">
                </font></div></td>
            <td width="0%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input type="Submit" name="Submit" onClick="check();" value="確定" >
                </font></div></td>
            <td width="48%" nowrap> <div align="left"></div>
              <div align="center"></div>
              <div align="center"></div>
              <div align="center"> 
                <table width="0%" border="2" cellpadding="0" cellspacing="1" bordercolor="#7188e0">
                  <tr> 
                    <td nowrap><font color="#0000FF" size="2">您查找的信息是</font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= Projectname %></font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= GuanLiNo %></font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= PartNo %></font></td>
                  </tr>
                </table>
              </div></td>
            <td width="9%" nowrap><a href="top-4.jsp"><font size="2">返回</font></a></td>
          </tr>
        </table>
      </div>
    </form>代碼已經貼出來了  請大家幫忙看看多謝
      

  3.   

    <jsp:useBean id="jb" scope="page" class="sqlserver.SqlServerBean"/>
    <body>
    <p> 
    <%
      String GuanLiNo = request.getParameter("GuanLiNo");
      String Projectname = request.getParameter("Projectname");
      String PartNo = request.getParameter("PartNo");
      
        session.getAttribute("GuanLiNo");
        session.getAttribute("Projectname");
        session.getAttribute("PartNo");
        
      String sql ;
      
      sql="select TOP 5* from PartPress where 1=1";
      if (GuanLiNo!= null & GuanLiNo.equals(""))
      sql = sql + "and GuanLiNo = '" + GuanLiNo+"'";
     
      if (Projectname != null & Projectname.equals(""))
      sql += sql + "and Projectname = '" + Projectname +"'";  if (PartNo != null & PartNo.equals(""))
      sql += sql + "and PartNo = '" + PartNo +"'";
      
      ResultSet rs = jb.query(sql);
      %>
    </p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p align="center"><font color="#000000" size="+2" face="華康相撲體">零件加工進度查詢</font></p>
    <div align="right"></div>
    <form name="form1">
      <div align="left"> 
        <table width="104%" border="0" cellpadding="0" cellspacing="0">
          <tr> 
            <td width="4%" nowrap><div align="center"><font color="#0000FF">工程名</font></div></td>
            <td width="4%" nowrap> <div align="center"> <font color="#0000FF"> 
                <select name="Projectname">
                  <option></option>
                  <option>MM</option>
                  <option>MC</option>
                  <option>MC3</option>
                  <option>EDM</option>
                  <option>WE</option>
                  <option>WH</option>
                  <option>MM2</option>
                  <option>MF</option>
                  <option>HT</option>
                </select>
                </font></div></td>
            <td width="5%" nowrap><div align="center"><font color="#0000FF">管理番號</font></div></td>
            <td width="13%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input name="GuanLiNo" type="text">
                </font></div></td>
            <td width="4%" nowrap><div align="center"><font color="#0000FF">零件號</font></div></td>
            <td width="13%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input type="text" name="PartNo">
                </font></div></td>
            <td width="0%" nowrap> <div align="center"> <font color="#0000FF"> 
                <input type="Submit" name="Submit" onClick="check();" value="確定" >
                </font></div></td>
            <td width="48%" nowrap> <div align="left"></div>
              <div align="center"></div>
              <div align="center"></div>
              <div align="center"> 
                <table width="0%" border="2" cellpadding="0" cellspacing="1" bordercolor="#7188e0">
                  <tr> 
                    <td nowrap><font color="#0000FF" size="2">您查找的信息是</font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= Projectname %></font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= GuanLiNo %></font></td>
                    <td nowrap bgcolor="#CCCCFF"><font color="#FF00FF" size="3"><%= PartNo %></font></td>
                  </tr>
                </table>
              </div></td>
            <td width="9%" nowrap><a href="top-4.jsp"><font size="2">返回</font></a></td>
          </tr>
        </table>
      </div>
    </form>代碼已經貼出來了 請大家幫忙看看 指點多謝
      

  4.   

    在Tomcat 5.0\work\Catalina\localhost\项目名\org.apache.jsp\目录下 找到TMP1icqpeyzi0_jsp.java第75行 就可以看到具体的错误了
      

  5.   

    java.lang.NullPointerException 空指针我估计在这
    String GuanLiNo = request.getParameter("GuanLiNo");
      String Projectname = request.getParameter("Projectname");
      String PartNo = request.getParameter("PartNo");你做一个
    if(GuanLiNo == null)
    {
      GuanLiNo ="";
    }
    那两个你自己做