fix travis jdk build and update to 0.12.2-RC1
fix travis jdk build and update to 0.12.2-RC1

Signed-off-by: Robert Roeser <91f2c51fb5c7c9648dfae98b40647470537285c9@gmail.com>

rsocket/rsocket-java,ReactiveSocket/reactivesocket-java,ReactiveSocket/reactivesocket-java