IntelliJ IDEA 2016.1 , all java project can not be compiled -

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when upgrade idea version 15.1 2016 projects report following compile time error：

error:module '**' production: java.lang.unsupportedclassversionerror: com/intellij/openapi/vfs/vfsutil : unsupported major.minor version 52.0

env: mac osx10.11 jdk7 maven3.3.9

who knows reasons, thanks!


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