Cannot create JDBC driver of class

org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '
' for connect URL 'null', cause: No suitable driver
在配置连接池时出现上面的错误的信息.
配置文件如下

<Context>
   <Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>
   <Resource name="jdbc/dwspring2" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="sa" password="123" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
               url="jdbc:microsoft:sqlserver://192.168.1.35:1433;DatabaseName=test;SelectMethod=cursor;"/>
 
 </Context>

按理不应该出现错误呀,又是一番找,一番思考,是不是版本的问题呢?
我的Tomcat时5.0的,上面的配置好象只对于5.5版本来说的吧
对于5.0的连接池的配置应该如下

<Context path="/spring2Web" docBase="spring2Web" debug="99" reloadable="true">
    <Logger className="org.apache.catalina.logger.FileLogger" 
        prefix="spring2Web_log." suffix=".txt" timestamp="true"/>

   <Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>
   <!--
   <Resource name="jdbc/dwspring2" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="sa" password="123" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
               url="jdbc:microsoft:sqlserver://192.168.1.35:1433;DatabaseName=test;SelectMethod=cursor;"/>
  -->
     <Resource name="jdbc/dwspring2" auth="Container" type="javax.sql.DataSource"/>
    <ResourceParams name="jdbc/dwspring2">
        <parameter>
            <name>factory</name>
            <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
        </parameter>
        <parameter>
            <name>maxActive</name>
            <value>100</value>
        </parameter>
        <parameter>
            <name>maxIdle</name>
            <value>30</value>
        </parameter>
        <parameter>
            <name>maxWait</name>
            <value>10000</value>
        </parameter>
        <parameter>
            <name>username</name>
            <value>sa</value>
        </parameter>
        <parameter>
            <name>password</name>
            <value>123</value>
        </parameter>
        <parameter>
            <name>driverClassName</name>
            <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
        </parameter>
        <parameter>
            <name>defaultAutoCommit</name>
            <value>true</value>
        </parameter>
        <parameter>
            <name>url</name>
            <value>jdbc:microsoft:sqlserver://192.168.1.35:1433;DatabaseName=test;SelectMethod=cursor;</value>
        </parameter>
        <parameter>
            <name>removeAbandoned</name>
            <value>true</value>
        </parameter>
        <parameter>
            <name>removeAbandonedTimeout</name>
            <value>60</value>
        </parameter>
        <parameter>
            <name>logAbandoned</name>
            <value>true</value>
        </parameter>
    </ResourceParams>

 </Context>

所以,现在很多的版本,一定要注意了.最好是能统一所有的版本就好了,就不会出现那么多的麻烦了.