Build path -No action available/classpath .project

从SVN download 下来的项目，发现的.Java 文件和平时的不一样，并且想加入jar 进去的时候没有Java Build Path 的选项，无法链接类的源码，项目也无法发布,这里记录分享：

原因是，在项目里面找到.project ，写入

Java代码收藏代码

org.eclipse.jdt.core.javanature

这样就行了，里面有各种属性，简单的记录一下：

1.工程名：

2.工程注释描述：

3.Eclipse插件：

4.加载方式：

关于里面能有哪些值，我这里就不多介绍了。而org.eclipse.jdt.core.javanature 是java Development Toolkit 的插件，很多JAVA API 等信息，都需要这个进行关联。

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