解决java compiler level does not match the version of the installed java project facet

java compiler level does not match the version of the installed java project facet错误的解决 因工作的关系，Eclipse开发的Java项目拷来拷去，有时候会报一个很奇怪的错误。明明源码一模一样，为什么项目复制到另一台机器上，就会报“java compiler level does not match the ver

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