XPathAPI rt.jar 访问受限问题
首先是针对出现该问题的project进行设置，按照下面步骤处理就可以了
1. Open project properties.
2. Select Java Build Path node.
3. Select Libraries tab.
4. Remove JRE System Library.
5. Add Library JRE System Library.
添加系统默认的JRE System Library 就可以了