室内空间设计要素:jsp连接池配置

为什么配置好了连接池后，tomcat启动不了了呀，哪位高人救救急呀！！！
我用的是tomcat5.5，数据库名为rcgl，根目录为d:/c_linhai/tomcat/webapps/ROOT,
我在tomcat/conf/server.xml的<host></host>加入了如下代码：
<Context path="/ROOT" docBase="d://c_linhai/tomcat/webapps/ROOt" debug="0" reloadable="true" >
<Resource name="jdbc/db"
auth="Container"
type="javax.sql.DataSource" />
<ResourceParams name="jdbc/db">
<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.
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>
<!—SQLServer dB username and password for dB connections -->
<parameter>
<name>username</name>
<value></value>
</parameter>
<parameter>
<name>password</name>
<value></value>
</parameter>
<!-- Class name for mm.mysql JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>Com.microsoft.jdbc.sqlserver.SQLServerDriver</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:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=rcgl</value>
</parameter>
</ResourceParams>
</Context>
而且在common/lib中加入了那三个驱动，还在jsp目录下的web-inf中加入了如下代码：
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/db</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
到底哪出问题了么？？？？？？？？？？？？？？谢谢各位了，帮帮忙了~!!!!!!!!!!!