4.0.0 rxjava-observables 1.0-SNAPSHOT rxjava-observables com.baeldung parent-java 0.0.1-SNAPSHOT ../parent-java io.reactivex rxjava ${rx.java.version} io.reactivex rxjava-string ${rx.java.string.version} org.assertj assertj-core ${assertj.version} 1.1.1 1.2.5 3.8.0