求助!TOMCAT问题

[墜↘★→辰]

我的tomcat配置两天了,tomcat启动时,但是在访问时却处于无限等待状态,
以下是日志:
org.apache.catalina.startup.Catalina start
严重: Catalina.start:
LifecycleException: No UserDatabase component found under key UserDatabase
at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:261)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1037)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2010-11-26 11:06:36 org.apache.catalina.startup.Catalina start
信息: Server startup in 87 ms
在网上找了好多资料,就是没有能解决问题的,那位大侠帮帮忙啊,不胜感激

[墜↘★→辰]

启动信息如下:
root@ubuntu:/usr/jsp/apache-tomcat-6.0.29/bin# ./startup.sh
Using CATALINA_BASE: /usr/jsp/apache-tomcat-6.0.29
Using CATALINA_HOME: /usr/jsp/apache-tomcat-6.0.29
Using CATALINA_TMPDIR: /usr/jsp/apache-tomcat-6.0.29/temp
Using JRE_HOME: /usr/jsp/jdk1.6.0_22/jre
Using CLASSPATH: /usr/jsp/apache-tomcat-6.0.29/bin/bootstrap.jar

[mesocool]

你的UserDatabase是怎么设置的。。