NicoK opened a new pull request #8448: [FLINK-12516][travis] use Ubuntu 16.04 LTS (Xenial) and change to openJDK8 URL: https://github.com/apache/flink/pull/8448 ## What is the purpose of the change This changes the test environment from trusty to xenial which is still supported until 2021-04 and provides more up-to-date system libraries. Since oraclejdk8 is not available in Travis' xenial image and we can't switch to oraclejdk9 yet, this also changes the JDK to openJDK8. ## Brief change log - change Travis' distribution to `xenial` - change Travis' JDK to `openjdk8` ## Verifying this change Run Travis tests. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): **no** - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: **no** - The serializers: **no** - The runtime per-record code paths (performance sensitive): **no** - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **no** - If yes, how is the feature documented? **not applicable**
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