jdk1.3文档:
This exception is thrown by the AccessController to indicate
* that a requested access (to a critical system resource such as the
* file system or the network) is denied.
*
* The reason to deny access can vary. For example, the requested
* permission might be of an incorrect type, contain an invalid
* value, or request access that is not allowed according to the
* security policy. Such information should be given whenever
* possible at the time the exception is thrown.
This exception is thrown by the AccessController to indicate
* that a requested access (to a critical system resource such as the
* file system or the network) is denied.
*
* The reason to deny access can vary. For example, the requested
* permission might be of an incorrect type, contain an invalid
* value, or request access that is not allowed according to the
* security policy. Such information should be given whenever
* possible at the time the exception is thrown.
你使用的是applet吗?
但,为什么?