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From "Parsons Technical Services" <>
Subject Re: JNDI Datasource Problem
Date Sun, 19 Feb 2006 19:02:27 GMT
Look up resource link. It goes in the context.xml

Also only put the jar file in the common/lib and no where else.

----- Original Message ----- 
From: "Mark Whitby" <>
To: "Tomcat Users List" <>
Sent: Sunday, February 19, 2006 12:53 PM
Subject: JNDI Datasource Problem

Hey guys,

Thanks for the help with the previous problem I had, I've managed to solve 
them now thanks to your help.  But now I'm having a problem with setting up 
a DataSource connection.  I've followed the example word for word and got 
the following error:

javax.servlet.ServletException: Unable to get connection, DataSource 
invalid: "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC 
driver of class '' for connect URL 'null'"

I did a google search for this but only managed to find something on the 
NetBeans website which wasn't much help.  I've edited the server.xml file as 
stated, placed the relevent jar file (mysql-connector-java-3.1.12-bin.jar) 
in the lib folder in my web application and in the /common/lib folder in the 
Tomcat home folder and I've reset the server and I'm still getting the same 

I'm using MySQL, database is called 'fyptest' and the table is called 
'testdata'.  So where am I going wrong?

Many thanks

Mark Whitby

Server.xml file:

<Context path="/DBTest" docBase="DBTest"
        debug="5" reloadable="true" crossContext="true">

  <Logger className="org.apache.catalina.logger.FileLogger"
             prefix="localhost_DBTest_log." suffix=".txt"

  <Resource name="jdbc/TestDB"

  <ResourceParams name="jdbc/TestDB">

    <!-- 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.

    <!-- Maximum number of idle dB connections to retain in pool.
         Set to -1 for no limit.  See also the DBCP documentation on this
         and the minEvictableIdleTimeMillis configuration 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.

    <!-- MySQL dB username and password for dB connections  -->

    <!-- Class name for the old mm.mysql JDBC driver - uncomment this entry 
and comment next
         if you want to use this driver - we recommend using Connector/J 

    <!-- Class name for the official MySQL Connector/J driver -->

    <!-- 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 
         connection.  mysqld by default closes idle connections after 8 

web.xml file:

      <description>DB Connection</description>

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