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From Mehdi.Ne...@bluewave.com
Subject MySQL Hell
Date Wed, 22 Jan 2003 15:13:39 GMT

Hello all,

i have been breaking my brain trying to get connection pooling, using
Tomcat 4.1.12's build in dbcp, with mySQL 3.23.

I have followed the instructions on the how this should be done, and I am
getting an exception when I try to get a connection .. (like many other
people it seems)..  If anyone has solved this problem.. or has a link to a
forum where this problem is answered please let me know..

I have downloaded mysql-connector-java-2.0.14.zip

I unzipped it and copied :
*  the contents of WEB-INF/lib to my lib folder
* contents of com to my WEB-INF/classes folder
* contents of org to my WEB-INF/classes folder (this *does* contain
org.gjt.mm.mysql.Driver)

This does not work.  My jsp test code follows, and the Exception occurs on
getConnection()...

<%@ page language="java" import="java.sql.*, javax.sql.*, javax.naming.*"
errorPage="error.jsp" %>

<%
      Context initContext = new InitialContext();
      Context envContext  = (Context)initContext.lookup("java:/comp/env");
      DataSource ds = (DataSource)envContext.lookup("jdbc/mehdi");
      Connection conn = ds.getConnection();

%>

Exception is

java.sql.SQLException: Cannot load JDBC driver class
'org.gjt.mm.mysql.Driver'

SERVER.XML

        <Context path="/mysql" docBase="mysql" debug="0" reloadable="true">

 <Logger className="org.apache.catalina.logger.FileLogger"
             prefix="localhost_DBTest_log." suffix=".txt"
             timestamp="true"/>

  <Resource name="jdbc/mehdi"
               auth="Container"
               type="javax.sql.DataSource"/>

  <ResourceParams name="jdbc/mehdi">
    <parameter>
      <name>factory</name>
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>

    <!-- Maximum number of dB connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to 0 for no limit.
         -->
    <parameter>
      <name>maxActive</name>
      <value>100</value>
    </parameter>

    <!-- Maximum number of idle dB connections to retain in pool.
         Set to 0 for no limit.
         -->
    <parameter>
      <name>maxIdle</name>
      <value>30</value>
    </parameter>

    <!-- Maximum time to wait for a dB connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->
    <parameter>
      <name>maxWait</name>
      <value>10000</value>
    </parameter>

    <!-- MySQL dB username and password for dB connections  -->
    <parameter>
     <name>username</name>
     <value>mehdi</value>
    </parameter>
    <parameter>
     <name>password</name>
     <value>mypass</value>
    </parameter>

    <!-- Class name for mm.mysql JDBC driver -->
    <parameter>
       <name>driverClassName</name>
       <value>org.gjt.mm.mysql.Driver</value>
    </parameter>

    <!-- The JDBC connection url for connecting to your MySQL dB.
         The autoReconnect=true argument to the url makes sure that the
         mm.mysql JDBC Driver will automatically reconnect if mysqld closed
the
         connection.  mysqld by default closes idle connections after 8
hours.
         -->
    <parameter>
      <name>url</name>
      <value>jdbc:mysql://localhost:3306/mehdi?autoReconnect=true</value>
    </parameter>
  </ResourceParams>

        </Context>


running out of time, and hair.

Thanks,

Med




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