[jdk17u-dev] RFR: 8280890: Cannot use '-Djava.system.class.loader' with class loader in signed JAR

[Alexander Veit]

Backport-of: a0f6f2409ea61ff9ed9dc2e2b46e309c751d456d

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Commit messages:
 - 8297684: NullPointerException in JarVerifier prevents JVM from starting
 - 8297684: NullPointerException in JarVerifier prevents JVM from starting

Changes: https://git.openjdk.org/jdk17u-dev/pull/947/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=947&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280890
  Stats: 192 lines in 4 files changed: 145 ins; 31 del; 16 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/947.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/947/head:pull/947

PR: https://git.openjdk.org/jdk17u-dev/pull/947