在Eclipse的视图Problems就可以看到相关错误信息,在Eclipse中选择->window->show view->other弹出对话框中选择general下面找problems然后双击,下方会有报错error:Description Resource Path Location Type Java compiler level does not match the version of the installed Java project facet. shop01 Unknown Faceted Project Problem (Java Version Mismatch)
解决方案:在项目上右键Properties->Project Facets,在打开的Project Facets页面中的Java下拉列表中,选择相应版本,若版本是jdk1.6,Java对应的version下拉选择1.6即可。