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With OAK-4189 we decided to go java 7 for trunk but we left behind the javadoc plugin
https://github.com/apache/jackrabbit-oak/blob/5427f6c6aa88f9a3d5c24b871c9515a94659df54/oak-parent/pom.xml#L104
OAK-4189 Increase Java language level to 1.7