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| | | Tomcat 5 - Cannot load JDBC driver class 'null ' SQL state: null | Tomcat 5 - Cannot load JDBC driver class 'null ' SQL state: null 2004-01-06 - By christopher justin
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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 (See http://cat-5.ora-code.com).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 (See http://sdp-1.ora-code.com).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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