[jdk21u-dev] RFR: 8334777: Test javax/management/remote/mandatory/notif/NotifReconnectDeadlockTest.java failed with NullPointerException

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 2a2964759c73b3b9ab6afaad109383c89952977b

Changes: https://git.openjdk.org/jdk21u-dev/pull/1239/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1239&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334777
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1239.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1239/head:pull/1239

PR: https://git.openjdk.org/jdk21u-dev/pull/1239