Exception opening database connection

Fri, 18 Jan 2002 18:54:44 -0800 

Hello,
I'm using the Tomcat's realm on JDBC for database access.
When I start the Tomcat server, I get the following error...

Any ideas?

TIA
Sridhar

Starting service Tomcat-Standalone
Apache Tomcat/4.0
Catalina.start: LifecycleException:  Exception opening database connection:  
java.sql.SQLException:
com.microsoft.jdbc.sqlserver.SQLServerDriver
LifecycleException:  Exception opening database connection:  java.sql.SQLException: 
com.microsoft.jd
bc.sqlserver.SQLServerDriver
        at org.apache.catalina.realm.JDBCRealm.start(JDBCRealm.java:615)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1108)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:3352)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:307)
        at org.apache.catalina.core.StandardService.start(StandardService.java:388)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:505)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:776)
        at org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
        at org.apache.catalina.startup.Catalina.process(Catalina.java:179)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:218)
----- Root Cause -----
java.sql.SQLException: com.microsoft.jdbc.sqlserver.SQLServerDriver
        at org.apache.catalina.realm.JDBCRealm.open(JDBCRealm.java:538)
        at org.apache.catalina.realm.JDBCRealm.start(JDBCRealm.java:613)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1108)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:3352)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:307)
        at org.apache.catalina.core.StandardService.start(StandardService.java:388)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:505)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:776)
        at org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
        at org.apache.catalina.startup.Catalina.process(Catalina.java:179)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:218)

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