java编译器不匹配问题(java compiler level does not match the version of the installed java project facet)
问题:项目经常copy过来,经常会报说Java编译器不匹配
解决方法:找到项目所在的目录,在.settings子目录里面,用文本编辑器打开org.eclipse.wst.common.project.facet.core.xml
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