环境：win7,eclipse neon版本。
问题描述：
The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project
解决方案：
引用jre，项目中没有引用jre库。在project->property->java build path->libraries->add library将jre包加进去。
Happy3w