xxx cannot be read or is not a valid ZIP file 解决方案

常见问题

1. Archive for required library: ‘WebContent/WEB-INF/lib/readme.txt’ in project ‘xxxxxxxxx’ cannot be read or is not a valid ZIP file

2. The project cannot be built until build path errors are resolved 

3. Target runtime Apache Tomcat v6.0 is not defined.

An internal error occurred during: "Initializing Java Tooling

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解决方法
1. 找到lib相应jar包删掉，然后重新导进去正确的jar包

1. 第一个问题解决后，此问题也会消失

2. 打开项目根目录下.settings文件夹中的org.eclipse.wst.common.project.facet.core.xml文件，将 “<runtime name=”Apache Tomcat v6.0″/>”这一句改成现在所需要的tomcat版本，或者删除中间几行，只留下下面三行就行 “<?xml version=”1.0″ encoding=”UTF-8″?> <faceted-project> </faceted-project>”

3. 重置窗口布局： windows > perspective > reset perspective
   如果重置窗口布局不管用的话，采用下面的这种方法：
   删除当前工作目录下/.metadata/.plugins/org.eclipse.core.resources/.project，然后重新启动Eclipse