RFR: 8357597: Proxy.getInvocationHandler throws NullPointerException instead of IllegalArgumentException for null [v2]

[Steffen Nießing]

> `Proxy#getInvocationHandler(Object)` throws a `NullPointerException` if the specified argument is `null`. This PR adds the missing `throws` declaration for the NPE.

Steffen Nießing has updated the pull request incrementally with one additional commit since the last revision:

  8357597: Update copyright year

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25419/files
  - new: https://git.openjdk.org/jdk/pull/25419/files/e70cb289..38854aa1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25419&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25419&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25419.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25419/head:pull/25419

PR: https://git.openjdk.org/jdk/pull/25419