[jdk20u] RFR: 8302491: NoClassDefFoundError omits the original cause of an error

[Ilarion Nakonechnyy]

Backport by request of @RealCLanger 
Tier2 testing is running, all ok by now.

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Commit messages:
 - minor corrections
 - Backport 5685107579f0f00b5eae881311315cec34c1ddcb

Changes: https://git.openjdk.org/jdk20u/pull/55/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=55&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302491
  Stats: 57 lines in 3 files changed: 21 ins; 13 del; 23 mod
  Patch: https://git.openjdk.org/jdk20u/pull/55.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/55/head:pull/55

PR: https://git.openjdk.org/jdk20u/pull/55