[jdk17] RFR: JDK-8266269: Lookup::accessClass fails with IAE when accessing an arrayClass with a protected inner class as component class [v2]

[Mandy Chung]

> `Lookup::accessClass` should determine the accessibility of the element type.  An array class is accessible if and only if its element type is accessible.
> 
> This also fixes a spec bug to document `@throws NullPointerException` if the argument is null.
> 
> Please review the CSR:
>     https://bugs.openjdk.java.net/browse/JDK-8269312

Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:

  remove extra import

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk17/pull/137/files
  - new: https://git.openjdk.java.net/jdk17/pull/137/files/96da75be..0579507f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk17&pr=137&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk17&pr=137&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/137.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/137/head:pull/137

PR: https://git.openjdk.java.net/jdk17/pull/137