博客指出Eclipse之前能正常定位Java基础类的Javadoc，近期却提示源文件和Javadoc缺失。作者不知如何重新选择基础文档位置，给出的解决方案是展开JRE系统库，找到rt.jar（Mac OS X为classes.jar），右键选‘属性’，即可指定Javadoc和源文件位置。
Up to a few days ago, Eclipse was working fine in locating the javadoc for base classes such as Java.io.File. Recently, though, hovering over these classes only yields a message indicating that the source and javadoc are missing:
"Note: This element has no attached source and the Javadoc could not be found in the attached Javadoc."
I couldn't for the life of me locate the option that would let me reselect the location of the basic documentation. Does anyone know how to fix this?
解决方案
Expand your JRE System library and find rt.jar (classes.jar for Mac OS X). Right click, and select 'Properties'.
You can then specify the Javadoc location (as well as the source location).
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