1，Can not find the tag library descriptor for "http://java.sun.com/jsp/ jstl/core" - Can not find the tag library descriptor for "http://java.sun.com/jsp/ jstl/core"
這個錯誤需導入java包
2，
現象：項目導進eclipse，在其中運行tomcat，會報如下錯：
“ Could not load the Tomcat server configuration at \Servers\Tomcat v6.0 Server @ localhost-config. The configuration may be corrupt or incomplete.
Resource is out of sync with the file system: /Servers/Tomcat v6.0 Server @ localhost-config/server.xml.”
解決方法是：
Window -> Preferences -> General -> Workspace，鈎選上“Refresh automatically”。
或者自己手動刷新一下。
eclipse document上說： External changes to resources will not be reflected in the workspace and resource objects until detected by the resources plug-in. （因為外部的文件系統的改變不能和工作台同步）