RFR: 8313874 - JNI NewWeakGlobalRef throws exception for null arg

[David Holmes]

On Tue, 8 Aug 2023 12:01:23 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> There's no check to see if obj is a weak global reference in this function. 

I'm not even sure what that means. Are `jweak` and `jobject` interchangeable i.e we should detect:

jweak j = env->NewWeakGlobalRef(env, env->NewWeakGlobalRef(env, obj));

??

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PR Comment: https://git.openjdk.org/jdk/pull/15188#issuecomment-1669499644