在TomCat中改了Realm后为什么再起时出现LifecycleException: Exception opening database connection:

[tallboylq]

我在tomcat中加了
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
connectionName="admin"
connectionPassword="admin"
driverName="oracle.jdbc.driver.OracleDriver"
connectionURL="jdbc:oracle:thin:@192.168.0.111:1521:orcl"
userTable="sp_um_users" userNameCol="userid" userCredCol="userpass"
userRoleTable="sp_am_userroles" roleNameCol="rolename" />
后再次运行tomcat为什么会出现
Catalina.start: LifecycleException: Exception opening database connection: jav
a.sql.SQLException: oracle.jdbc.driver.OracleDriver
LifecycleException: Exception opening database connection: java.sql.SQLExcepti
on: oracle.jdbc.driver.OracleDriver
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.StandardEngine.start(StandardEngine.java:307
)
at org.apache.catalina.core.StandardService.start(StandardService.java:3
88)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:218)
----- Root Cause -----
java.sql.SQLException: oracle.jdbc.driver.OracleDriver
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.StandardEngine.start(StandardEngine.java:307
)
at org.apache.catalina.core.StandardService.start(StandardService.java:3
88)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:218)