Adding a JNI weak ref check. There's a couple of other similar places in the code where a JNI weak ref is checked for null, in the rest of the code we pass such refs to java where they are checked for null. So, I was not able to eye catch any other similar place in the a11y code where such check is also required.
------------- Commit messages: - 8275809: crash in [CommonComponentAccessibility getCAccessible:withEnv:] Changes: https://git.openjdk.java.net/jdk/pull/6083/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6083&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8275809 Stats: 22 lines in 1 file changed: 7 ins; 5 del; 10 mod Patch: https://git.openjdk.java.net/jdk/pull/6083.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/6083/head:pull/6083 PR: https://git.openjdk.java.net/jdk/pull/6083
