The cause and effect are quite right, though. The reason Kotlin was designed in 2009-2010 was because Java became stagnant, not by choice, but due to Sun's demi

The cause and effect are quite right, though. The reason Kotlin was designed in 2009-2010 was because Java became stagnant, not by choice, but due to Sun's demise. After the acquisition and an adjustment period, Oracle gradually increased investment, and the evolution pace got back to it's "normal" course. So Java's "revival" and Kotlin's existence are, indeed, related, but one did not cause the other; rather, they both have a common cause.