Java compiler level does not match the version of the installed Java project facet.解决办法
问题原因:
出现这个问题的原因是因为,eclipse/myeclipse的jdk编译版本与出现问题的项目JDK编译版本不一致所导致!
解决办法:
工程名---->右键properties---->Project Facets---->Java(1.7)
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