org.apache.commons.dbcp.SQLNestedException: Cannot create
JDBC driver of class '' for connect URL 'null'
Is the error I get.
When they compiled the latest �stable�
Tomcat, did they bother to
test it before putting it out?
I looke through the entire google, and through this entire list, and I found lots of people having this problem. Yet, I didn�t find any solutions (that worked for me that is).
Basically, here�s what I have:
I�m running Tomcat 5.0.27 on
Java 1.5 beta 2; I am using MySQL 4.1.2
Inside /common/lib/ I have mysql-connector.jar which is 3.0.14 � production version.
Inside my server.xml I have (relevant stuff):
<Host appBase="/home/resk/web" name="resk" autoDeploy="true" unpackWARs="true" liveDeploy="true">
</Host>
Inside my /conf/Catalina/resk I have resk.xml:
<?xml version='1.0' encoding='utf-8'?>
<Context debug="5" displayName="RESK" docBase="ROOT" // BY THE WAY I also tried /home/resk/web/ROOT
path="/" reloadable="false">
<Environment name="data.source.name" type="java.lang.String" value="java:comp/env/jdbc/RESK"/> // BTW I tried without this line
<Resource auth="Container" name="jdbc/RESK"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/RESK">
<parameter>
<name>url</name>
<value>jdbc:mysql://127.0.0.1:3306/resk?autoReconnect=true</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>2</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>10</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<parameter>
<name>removeAbandoned</name>
<value>true</value>
</parameter>
<parameter>
<name>username</name>
<value>resk</value>
</parameter>
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>removeAbandonedTimeout</name>
<value>60</value>
</parameter>
<parameter>
<name>password</name>
<value>RESK</value>
</parameter>
</ResourceParams>
</Context>
Inside my /home/resk/web/ROOT/WEB-INF/ I have web.xml (relevant stuff):
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/RESK</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<!-- Used for startup primarly. Kepping things in one place. -->
<env-entry>
<env-entry-name>data.source.name</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>java:comp/env/jdbc/RESK</env-entry-value>
</env-entry>
Now, here�s how I load the data source (relevant part of the class):
public class Manager
{
DataSource ds;
static Manager instance;
private Manager()
{
try
{
// This is all the web.xml properties
InitialContext context = new InitialContext();
dbDataSource = (
String)context.lookup("java:comp/env/data.source.name");
ds = (DataSource) new InitialContext().lookup(dbDataSource);
}
catch ( NamingException e )
{
Logger.getLogger("problem").fatal("Unable to load database data source!",e);
ds = null; // This will throw enough exceptions to notice the problem
}
}
/**
* @return instance of the Manager.
*/
public static Manager getInstance()
{
if (instance == null) instance = new Manager();
return instance;
}
/**
* @return Connection from the pool. Make sure to close it when done.
*/
public synchronized Connection getConnection() throws SQLException
{
return ds.getConnection();
}
�
}
Now, interesting thing to note. If I look at my catalina_log.2004-07-11.txt, I will find the following:
2004-07-11 20:47:47 NamingContextListener[/Catalina/resk/]: Resource parameters for jdbc/RESK = ResourceParams[name=jdbc/RESK, parameters={url=jdbc:mysql://127.0.0.1:3306/resk?autoReconnect=true, maxIdle=2, maxActive=10, driverClassName=com.mysql.jdbc.Driver, maxWait=10000, removeAbandoned=true, username=resk, factory=org.apache.commons.dbcp.BasicDataSourceFactory, removeAbandonedTimeout=60, password=RESK}]
2004-07-11 20:47:47 NamingContextListener[/Catalina/resk/]: Adding resource ref jdbc/RESK
2004-07-11 20:47:47 NamingContextListener[/Catalina/resk/]: ResourceRef[className=javax.sql.DataSource,factoryClassLocation=null,factoryClassName=org.apache.naming.factory.ResourceFactory,{type=scope,content=Shareable},{type=auth,content=Container},{type=url,content=jdbc:mysql://127.0.0.1:3306/resk?autoReconnect=true},{type=maxIdle,content=2},{type=maxActive,content=10},{type=driverClassName,content=com.mysql.jdbc.Driver},{type=maxWait,content=10000},{type=removeAbandoned,content=true},{type=username,content=resk},{type=factory,content=org.apache.commons .dbcp.BasicDataSourceFactory},{type=removeAbandonedTimeout,content=60},{type=password,content=RESK}]
2004-07-11 20:47:47 NamingContextListener[/Catalina/resk/]: Adding environment entry data.source.name
2004-07-11 20:47:47 NamingContextListener[/Catalina/resk/]: Resource parameters for UserTransaction = null
Looking through this stuff it�s obvious that my resource IS found, and that it IS loaded. Yet, somehow, My application does not see it�
Anybody knows why? Any help will be greatly appreciated�
