RFR: 8365483: Test sun/rmi/runtime/Log/6409194/NoConsoleOutput.java sometimes fails [v3]

[David Beaumont]

> The writer field of the handler needs to be re-checked for null inside the locked region before use.

David Beaumont has updated the pull request incrementally with one additional commit since the last revision:

  License fix.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27173/files
  - new: https://git.openjdk.org/jdk/pull/27173/files/2992350f..213361cb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27173&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27173&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27173.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27173/head:pull/27173

PR: https://git.openjdk.org/jdk/pull/27173