RFR: 8259343: [macOS] Update JNI error handling in Cocoa code.

[Sergey Bylokhov]

On Wed, 6 Jan 2021 21:14:06 GMT, Phil Race <prr at openjdk.org> wrote:

> Proposed updates to JNI error handling.

src/java.desktop/macosx/native/libosxapp/JNIUtilities.h line 41:

> 39:        NSLog(@"%@",[NSThread callStackSymbols]); \
> 40:        if ([NSThread isMainThread] == NO) { \
> 41:            if ((*env)->ExceptionOccurred(env) == NULL) { \

Not sure that the check for ExceptionOccurred is needed, in all other places where we check the ref to methods/field we only check the return value, and if it is null then return immediately assuming that an exception is rased already, for example :
https://github.com/openjdk/jdk/blob/b72de3c5fc99f365e9fb25114ddd28eceddfa6e8/src/java.desktop/windows/native/libawt/windows/awt_Button.cpp#L357

Note that the exception in the static initializer is fatal for the application.

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PR: https://git.openjdk.java.net/jdk/pull/1967