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From: John Walstra <jwalstra@spoonserver.com>
Reply-To: jwalstra@spoonserver.com
To: Tomcat Mailing List <tomcat-user@jakarta.apache.org>
Subject: Cannot load JDBC driver class 'null'
Date: Sun, 22 Sep 2002 22:33:11 -0500
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I'm trying to set up a JNDI connection to MySQL. I'm using the binary release 
of 4.1.11 with 4.0.4's jasper-compiler.jar and jasper-runtime.jar. I'm also 
using mysql-connector-java-2.0.14.

It's very similar to this thread 
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/msg64346.html , 
however I still can't get mine working after reading that thread. I've 
basically followed (cut and paste) the JNDI Datasource HOWTO, 
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html 
.

Here is the Context section of my server.xml

        <Context path="/jkw" 
		docBase="/usr/local/web/meta-htdocs/JWALSTRA/htdocs/jsp"
                debug="5" useNaming="true"
                reloadable="true" crossContext="true">

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

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

		<ResourceParams name="jdbc/JKW">
			<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>nobody</value>
			</parameter>
			<parameter>
				<name>password</name>
				<value></value>
			</parameter>

			<!-- Class name for mm.mysql JDBC driver -->
			<parameter>
				<name>driverClassName</name>
				<value>com.mysql.jdbc.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/jkw?autoReconnect=true</value>
			</parameter>
		</ResourceParams>
        </Context>

Here is my web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

  <taglib>
    <taglib-uri>
      /orataglib
    </taglib-uri>
    <taglib-location>
      /WEB-INF/tlds/orataglib_1_0_3.tld
    </taglib-location>
  </taglib>

  <taglib>
    <taglib-uri>
      /jkw
    </taglib-uri>
    <taglib-location>
      /WEB-INF/tlds/jkw-1.0.tld
    </taglib-location>
  </taglib>

  <resource-ref>
    <description>MySQL DB Connection</description>
    <res-ref-name>jdbc/JKW</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>

</web-app>

My common/lib directory ... (jasper* is from 4.0.4)

-rw-r--r--    1 root     root        45386 Sep 19 08:30 activation.jar
-rw-r--r--    1 root     root       716139 Sep 19 08:30 ant.jar
-rw-r--r--    1 root     root        90503 Sep 19 08:30 
commons-collections.jar
-rw-r--r--    1 root     root        62998 Sep 19 08:30 commons-dbcp.jar
-rw-r--r--    1 root     root        16910 Sep 19 08:30 
commons-logging-api.jar
-rw-r--r--    1 root     root        28930 Sep 19 08:30 commons-pool.jar
-rw-r--r--    1 root     root       210191 Sep 22 21:40 jasper-compiler.jar
-rw-r--r--    1 root     root        67077 Sep 22 21:40 jasper-runtime.jar
-rw-r--r--    1 root     root        84854 Sep 19 08:30 jdbc2_0-stdext.jar
-rw-r--r--    1 root     root        98496 Sep 19 08:30 jndi.jar
-rw-r--r--    1 root     root         8674 Sep 19 08:30 jta.jar
-rw-r--r--    1 root     root       280984 Sep 19 08:30 mail.jar
-rw-r--r--    1 root     root       125961 Sep 22 21:27 
mysql-connector-java-2.0.14-bin.jar
-rw-r--r--    1 root     root        28664 Sep 19 08:30 naming-common.jar
-rw-r--r--    1 root     root        18222 Sep 19 08:30 naming-factory.jar
-rw-r--r--    1 root     root        37601 Sep 19 08:30 naming-resources.jar
-rw-r--r--    1 root     root        80054 Sep 19 08:30 servlet.jar

Here is my code sniplet ...

    Connection conn = null;
    Statement stmt = null;
    ResultSet rset = null;

    Context ctx = new InitialContext();
    if(ctx == null )
    {
      throw new Exception("Boom - No Context");
    }

    DataSource ds = (DataSource)ctx.lookup( "java:comp/env/jdbc/JKW");

    try
    {
      conn = ds.getConnection();
      stmt = conn.createStatement();

And the error message ...

java.sql.SQLException: Cannot load JDBC driver class 'null'
        at 
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:529)
        at 
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312)
        at jkw.jsp.beans.SkillTypeBean.setTypeId(SkillTypeBean.java:42)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


Any ideas?

Thanks,
John

-- 
John Walstra
jwalstra@spoonserver.com
john_walstra@yahoo.com
jwalstra@wi.rr.com

Don't abandon hope.  Your Captain Midnight decoder ring arrives tomorrow.

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