I think what you mean to do here:
> <% session.setAttribute("conn1",conn1); %>
is actually:
<% session.setAttribute("conn1",
pageContext.getAttribute("conn1")); %>
However, as Marius pointed out in a previous email,
this is incredibly bad practice and no substitute for
proper connection pooling.
- Morgan
--- mihai manuta <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I need to create a connection in one page and then
> pass the same connection
> to another page.
> The following is an example of what I've done:
>
> FIRST FILE:
>
> <%@ taglib
> uri="http://jakarta.apache.org/taglibs/jdbc"
> prefix="sql" %>
>
> <html>
> <head>
> <title>JSP Test</title>
> </head>
>
> <body>
>
> <%
> String driver = "dirver";
> String user = "user";
> String password = "password";
> String host = "url";
> %>
>
> <font color="Green" face="Arial">trying to establish
> a connection...
>
> <br>
>
> <sql:connection id="conn1">
> <sql:url><%=url%></sql:url>
> <sql:driver><%=driver%></sql:driver>
> <sql:userId><%=user%></sql:userId>
> <sql:password><%=password%></sql:password>
> </sql:connection>
> connection established...
> <br>
>
> <table>
> <sql:statement id="qGetParam" conn="conn1">
> <sql:query>
> select * from attachedfile
> </sql:query>
> <sql:resultSet id ="rs1">
> <tr>
> <td><sql:getColumn position="3"/></td>
> </tr>
> </sql:resultSet>
> </sql:statement>
> </table>
>
> <%=conn1%>
>
> <% session.setAttribute("conn1",conn1); %>
>
> <a href="Page2.jsp">xxx</a>
>
> </font>
> </body>
> </html>
>
> SECOND FILE:
>
> <%@ taglib
> uri="http://jakarta.apache.org/taglibs/jdbc"
> prefix="sql" %>
>
> <%@ page import="java.sql.*" %>
>
> <html>
> <head>
> <title>JSP Test</title>
> </head>
>
> <body>
>
> <% Connection conn1 =
> (Connection)session.getAttribute("conn1"); %>
>
> <%=conn1%><br>
>
> <%
> Statement stmt=conn1.createStatement();
> ResultSet rs=stmt.executeQuery("select *
> from attachedfile");
> rs.next();
> %>
> <br>
> <%=rs.getString(3)%>
>
> <table>
> <sql:statement id="qGetgf" conn="conn1">
> <sql:query>
> select * from attachedfile
> </sql:query>
> <sql:resultSet id ="rgf">
> <tr>
> <td><sql:getColumn position="3"/></td>
> </tr>
> </sql:resultSet>
> </sql:statement>
> </table>
>
>
> </body>
> </html>
>
> Everithing works just fine until I try to use the
> connection stored in
> session from the first page to create another
> statement (using tag lib). At
> that point I get an exeption
>
> Root cause:
>
> java.lang.NullPointerException
> at
>
org.apache.taglibs.jdbc.statement.StatementImplTag.doStartTag(StatementImplT
> ag.java:137)
> at
>
_0002fnew_0005fpage_0002ejspnew_0005fpage_jsp_7._jspService(_0002fnew_0005fp
> age_0002ejspnew_0005fpage_jsp_7.java:109)
> at
>
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
> at
>
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
>
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.ja
> va:177)
> at
>
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
> at
>
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
> at
>
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
>
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
> at
>
org.apache.tomcat.core.Handler.service(Handler.java:286)
> at
>
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
> at
>
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
> 7)
> at
>
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
> at
>
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
> onnectionHandler.java:210)
> at
>
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
> at
>
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
> at java.lang.Thread.run(Thread.java:484)
>
> that I have no ideea what it means. The connection
> exists, it's executing
> the querry (from the first part)... but... what can
> I do?!Please help!
> Mihai Manuta
>
>
=====
Morgan Delagrange
Britannica.com
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