RFR: 8323965: modify fix for 8317771 to remove reflection instantiation of the inner class

[Artem Semenov]

I replaced reflection with using an accessor
@azuev-java please review

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Commit messages:
 - 8323965 modify fix for 8317771 to remove reflection instantiation of the inner class

Changes: https://git.openjdk.org/jdk/pull/18867/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18867&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323965
  Stats: 63 lines in 3 files changed: 51 ins; 11 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18867.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18867/head:pull/18867

PR: https://git.openjdk.org/jdk/pull/18867