[jdk17u-dev] RFR: 8299739: HashedPasswordFileTest.java and ExceptionTest.java can fail with java.lang.NullPointerException

[Goetz Lindenmaier]

I backport this for parity with 17.0.15-oracle.

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Commit messages:
 - Backport 04f30185e914c10c918d0eff1fb63fd96e1139fb

Changes: https://git.openjdk.org/jdk17u-dev/pull/3083/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299739
  Stats: 18 lines in 2 files changed: 9 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3083.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3083/head:pull/3083

PR: https://git.openjdk.org/jdk17u-dev/pull/3083