Tomcat 5 - Cannot load JDBC driver class 'null' SQL state: null

Tue, 06 Jan 2004 12:20:20 -0800

A solution to this problem would be greatly appreciated. I have now spent over 10 hours investigating this problem, and still have no solution. We have installed Tomcat 5 and the latest MySQl ConnectorJ driver on 3 different platforms, and experience this annoying, what seems to be common problem, yet no solution with Tomcat 5. I have configured, re-configured, followed discussion forems (mainly related to Tomcat 4). The mysql connectorJ jar file is in $CATALINA/common/lib like stated at http://jakarta.apache.org/tomcat/tomcat-5.0-doc/jndi-datasource-examples-howto.html . There something not documented or clear in the docs, as many people are having this issue.

Here is the SQLException

Error: java.sql.SQLException: Cannot load JDBC driver class 'null' SQL state: null

Here is a snap shot of the server.xml file:
<GlobalNamingResources>
<Environment description="Absolute Pathname of the JWSDP Installation" name="jwsdp.home" override="true" type="java.lang.String" value="C:\jwsdp-1.3"/>
<Environment name="simpleValue" override="true" type="java.lang.Integer" value="30"/>
<!-- Editable user database that can also be used by UserDatabaseRealm to authenticate users -->
<Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>

<Context path="/AuthorizedTest" docBase="AuthorizedTest" debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_DBTest_log." suffix=".txt" timestamp="true"/>

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

   <ResourceParams name="jdbc/AuthorizedTest">
   <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>local_local</value>
   </parameter>
   <parameter>
    <name>password</name>
    <value>walkon03</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://www.local-underground.com:3306/local_maillist?autoReconnect=true</value>
</parameter>
</ResourceParams>
</Context>
</GlobalNamingResources>


Here is a snap shot of our WEB-INF/web.xml file:
<resource-ref>
     <description>DB Connection</description>
     <res-ref-name>jdbc/AuthorizedTest</res-ref-name>
     <res-type>javax.sql.DataSource</res-type>
     <res-auth>Container</res-auth>
 </resource-ref>


Does anyone have a successful Tomcat 5 and MySQL Connector J configuration? In desparate need of the correct configuration. Thanks all.

chris

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