Correction of NPE and updating of test cases. Minor refactoring of test library also.
------------- Commit messages: - 8255348: NPE in PKIXCertPathValidator event logging code Changes: https://git.openjdk.java.net/jdk/pull/2150/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2150&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8255348 Stats: 83 lines in 6 files changed: 60 ins; 2 del; 21 mod Patch: https://git.openjdk.java.net/jdk/pull/2150.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2150/head:pull/2150 PR: https://git.openjdk.java.net/jdk/pull/2150
