Stop building on openjdk9 and openjdk10 because SNAPSHOT dependencies cannot be downloaded.
Stop building on openjdk9 and openjdk10 because SNAPSHOT dependencies cannot be downloaded.

We get the error message "sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target".

There are workarounds for this described in https://github.com/travis-ci/travis-ci/issues/9368
but rather than using those workarounds I think it's OK to skip these jdks.

cucumber/gherkin-java,cucumber/gherkin-java,cucumber/gherkin-java,cucumber/gherkin-java