RFR: 8278519: serviceability/jvmti/FieldAccessWatch/FieldAccessWatch.java failed "assert(handle != __null) failed: JNI handle should not be null" [v2]

[Alex Menkov]

> The fix adds a check in the event handler which filters out event from non-test threads

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  Updated copyright

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6874/files
  - new: https://git.openjdk.java.net/jdk/pull/6874/files/022a689f..35a6a35a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6874&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6874&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6874.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6874/head:pull/6874

PR: https://git.openjdk.java.net/jdk/pull/6874