tomcat的页面连接池无法使用 (急，在线等)
打开tomcat4.1的admin页面，添加数据库时，没法添加，出错显示：
Message:Error   invoking   operation   addResource
description   :The   server   encountered   an   internal   error   (Error   invoking   operation   addResource)   that   prevented   it   from   fulfilling   this   request.

------解决方案--------------------
这样的错误，，，，，

2007-9-5 16:09:26 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2007-9-5 16:09:26 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1937 ms
2007-9-5 16:09:27 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2007-9-5 16:09:27 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.0.28
2007-9-5 16:09:27 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2007-9-5 16:09:27 org.apache.catalina.core.StandardHost getDeployer
信息: Create Host deployer for direct deployment ( non-jmx )
2007-9-5 16:09:27 org.apache.catalina.core.StandardHostDeployer install
信息: Processing Context configuration file URL file:D:\tomcat-5.0.28\conf\Catalina\localhost\admin.xml
2007-9-5 16:09:28 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config= 'org.apache.struts.util.LocalStrings ', returnNull=true
2007-9-5 16:09:28 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config= 'org.apache.struts.action.ActionResources ', returnNull=true
2007-9-5 16:09:29 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config= 'org.apache.webapp.admin.ApplicationResources ', returnNull=true
2007-9-5 16:09:31 org.apache.catalina.core.StandardHostDeployer install
信息: Processing Context configuration file URL file:D:\tomcat-5.0.28\conf\Catalina\localhost\balancer.xml
2007-9-5 16:09:32 org.apache.catalina.core.StandardHostDeployer install
信息: Processing Context configuration file URL file:D:\tomcat-5.0.28\conf\Catalina\localhost\manager.xml
2007-9-5 16:09:32 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path from URL file:D:\tomcat-5.0.28\webapps\ROOT
2007-9-5 16:09:32 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path /jsp-examples from URL file:D:\tomcat-5.0.28\webapps\jsp-examples
2007-9-5 16:09:32 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path /servlets-examples from URL file:D:\tomcat-5.0.28\webapps\servlets-examples
2007-9-5 16:09:33 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path /tomcat-docs from URL file:D:\tomcat-5.0.28\webapps\tomcat-docs
2007-9-5 16:09:33 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path /webdav from URL file:D:\tomcat-5.0.28\webapps\webdav
2007-9-5 16:09:33 org.apache.catalina.core.StandardHostDeployer install
信息: Installing web application at context path /Machine.myeclipse.bak from URL file:D:\tomcat-5.0.28\webapps\Machine.myeclipse.bak
2007-9-5 16:09:35 org.apache.struts.action.ActionServlet initModuleDataSources
严重: Initializing application data source conn
org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class ' ' for connect URL 'jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=demo '
at org.a