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Currently the CI build is broken (https://travis-ci.org/github/vavr-io/vavr-test/builds/760872304) on Open JDK 10, 11, ,12, 13 because Travis failed to download OpenJDK from the Trusty build environment. This PR mitigates the problem by upgrading to Xenial build environment and fixes the new failures on Xenial by changing the Oracle JDK 8, 9 by Open JDK 8, 9.