Cannot create JDBC driver of class '' for connect URL 'null' 错误

Cannot create JDBC driver of class '' for connect URL 'null' 错误

关于Tomcat 5.5.XX数据源配置出现连接问题的解决
错误信息：Cannot create JDBC driver of class '' for connect URL 'null'

当我们用Tomcat5.0.XX时，以Oracle为例，一般我们的配置如下，但直接移到5.5.XX时就会发生错误
<Resource name="jdbc/XXX" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/XXX">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>password</name>
<value>password</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbcracle:thin:@localhost:1521:SID</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>username</name>
<value>username</value>
</parameter>
</ResourceParams>

当要移植到Tomcat5.5.XX时，配置应当修改一下，如下所示：

<Resource
name="jdbc/XXX"
type="javax.sql.DataSource"
password="password"
driverClassName="oracle.jdbc.driver.OracleDriver"
maxIdle="2"
maxWait="5000"
username="username"
url="jdbcracle:thin:@localhost:1521:SID"
maxActive="4"/>