8260857: Remove JNFWeakJObjectWrapper from Lanai Project

src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLLayer.h

@@ -35,7 +35,7 @@
 @interface MTLLayer : CAMetalLayer
 {
 @private
-    JNFWeakJObjectWrapper *javaLayer;
+    jobject javaLayer;
 
     // intermediate buffer, used the RQ lock to synchronize
     MTLContext* ctx;
@@ -48,7 +48,7 @@
     CVDisplayLinkRef displayLink;
 }
 
-@property (nonatomic, retain) JNFWeakJObjectWrapper *javaLayer;
+@property (nonatomic) jobject javaLayer;
 @property (readwrite, assign) MTLContext* ctx;
 @property (readwrite, assign) float bufferWidth;
 @property (readwrite, assign) float bufferHeight;
@@ -58,7 +58,7 @@
 @property (readwrite, assign) int leftInset;
 @property (readwrite, assign) CVDisplayLinkRef displayLink;
 
-- (id) initWithJavaLayer:(JNFWeakJObjectWrapper *)layer;
+- (id) initWithJavaLayer:(jobject)layer;
 
 - (void) blitTexture;
 - (void) fillParallelogramCtxX:(jfloat)x

src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLLayer.m

@@ -43,7 +43,7 @@ @implementation MTLLayer
 @synthesize nextDrawableCount;
 @synthesize displayLink;
 
-- (id) initWithJavaLayer:(JNFWeakJObjectWrapper *)layer
+- (id) initWithJavaLayer:(jobject)layer
 {
     AWT_ASSERT_APPKIT_THREAD;
     // Initialize ourselves
@@ -122,6 +122,8 @@ - (void) blitTexture {
 }
 
 - (void) dealloc {
+    JNIEnv *env = [ThreadUtilities getJNIEnvUncached];
+    (*env)->DeleteWeakGlobalRef(env, self.javaLayer);
     self.javaLayer = nil;
     [self stopDisplayLink];
     CVDisplayLinkRelease(self.displayLink);
@@ -135,7 +137,7 @@ - (void) blitCallback {
     DECLARE_CLASS(jc_JavaLayer, "sun/java2d/metal/MTLLayer");
     DECLARE_METHOD(jm_drawInMTLContext, jc_JavaLayer, "drawInMTLContext", "()V");
 
-    jobject javaLayerLocalRef = [self.javaLayer jObjectWithEnv:env];
+    jobject javaLayerLocalRef = (*env)->NewLocalRef(env, self.javaLayer);
     if ((*env)->IsSameObject(env, javaLayerLocalRef, NULL)) {
         return;
     }
@@ -191,7 +193,7 @@ CVReturn displayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp* no
 
 JNI_COCOA_ENTER(env);
 
-    JNFWeakJObjectWrapper *javaLayer = [JNFWeakJObjectWrapper wrapperWithJObject:obj withEnv:env];
+    jobject javaLayer = (*env)->NewWeakGlobalRef(env, obj);
 
     [ThreadUtilities performOnMainThreadWaiting:YES block:^(){
             AWT_ASSERT_APPKIT_THREAD;