add @exception message to indicate an NPE might be thrown when the input parameter is null
------------- Commit messages: - https://bugs.openjdk.org/browse/JDK-6205692 : add @exception message to indicate an NPE might be thrown when the input parameter is null Changes: https://git.openjdk.org/jdk/pull/9859/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9859&range=00 Issue: https://bugs.openjdk.org/browse/JDK-6205692 Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/9859.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9859/head:pull/9859 PR: https://git.openjdk.org/jdk/pull/9859
