`ProxySelector.select` and `connectFailed` methods should throw `IllegalArgumentException`s on null parameters.
Additionally, the `select` method doesn't need to be synchronized - the selector is immutable. Tier2 green. ------------- Commit messages: - Fix connectFailed, add test - Improve null handling Changes: https://git.openjdk.org/jdk/pull/16199/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16199&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8318150 Stats: 74 lines in 2 files changed: 19 ins; 24 del; 31 mod Patch: https://git.openjdk.org/jdk/pull/16199.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16199/head:pull/16199 PR: https://git.openjdk.org/jdk/pull/16199
