假定您使用的是现有的Ubuntu Tomcat，默认情况下，安全管理器将锁定所有内容.建议您阅读此页面:

Assuming you are using the stock Ubuntu Tomcat, everything is locked down by the security manager by default. Suggest you read this page:

http://tomcat.apache.org/tomcat -6.0-doc/security-manager-howto.html

并了解其工作原理.您需要对$CATALINA_BASE/conf/catalina.policy文件进行更改，以授予访问权限，让您的Web应用程序位于文件系统上.

and get a grasp on how it works. You'll need to make changes to $CATALINA_BASE/conf/catalina.policy file, granting access where your webapp is located on the filesystem.