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The Maven project support currently identify the source level with the Maven Compiler property maven.compiler.source, since Maven Compiler 3.6.0 the property maven.compiler.release can also be used to set the targeted release (including its source level) when running on JDK 9 (by delegating to --release flag of javac [JEP247]).
*** Bug 270634 has been marked as a duplicate of this bug. ***