8298645: JNI works with accessibleSelection on a wrong thread

Reviewed-by: serb, kizune

src/java.desktop/macosx/classes/sun/lwawt/macosx/CAccessibility.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -817,6 +817,26 @@ class CAccessibility implements PropertyChangeListener {
         }, c);
     }
 
+    // This method is called from the native in ComboBoxAccessibility.m
+    private static Accessible getAccessibleComboboxValue(Accessible a, Component c) {
+        if (a == null) return null;
+
+        return invokeAndWait(new Callable<Accessible>() {
+            @Override
+            public Accessible call() throws Exception {
+                AccessibleContext ac = a.getAccessibleContext();
+                if (ac != null) {
+                    AccessibleSelection as = ac.getAccessibleSelection();
+                    if (as != null) {
+                        return as.getAccessibleSelection(0);
+                    }
+                }
+
+                return null;
+            }
+        }, c);
+    }
+
     @Native private static final int JAVA_AX_ROWS = 1;
     @Native private static final int JAVA_AX_COLS = 2;
 

src/java.desktop/macosx/native/libawt_lwawt/awt/a11y/ComboBoxAccessibility.m

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2021, JetBrains s.r.o.. All rights reserved.
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2022, JetBrains s.r.o.. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -37,46 +37,26 @@ static jmethodID sjm_getAccessibleName = NULL;
     GET_STATIC_METHOD_RETURN(sjm_getAccessibleName, sjc_CAccessibility, "getAccessibleName", \
                      "(Ljavax/accessibility/Accessible;Ljava/awt/Component;)Ljava/lang/String;", ret);
 
-static jmethodID sjm_getAccessibleSelection = NULL;
-#define GET_ACCESSIBLESELECTION_METHOD_RETURN(ret) \
-    GET_CACCESSIBILITY_CLASS_RETURN(ret); \
-    GET_STATIC_METHOD_RETURN(sjm_getAccessibleSelection, sjc_CAccessibility, "getAccessibleSelection", \
-    "(Ljavax/accessibility/AccessibleContext;Ljava/awt/Component;)Ljavax/accessibility/AccessibleSelection;", ret);
-
 @implementation ComboBoxAccessibility
 
-// NSAccessibilityElement protocol methods
-
-- (id)accessibilityValue {
+- (CommonComponentAccessibility *)accessibleSelection
+{
     JNIEnv *env = [ThreadUtilities getJNIEnv];
-    jobject axContext = [self axContextWithEnv:env];
-    if (axContext == NULL) return nil;
-    GET_ACCESSIBLESELECTION_METHOD_RETURN(nil);
-    jobject axSelection = (*env)->CallStaticObjectMethod(env, sjc_CAccessibility, sjm_getAccessibleSelection, axContext, self->fComponent);
+    GET_CACCESSIBILITY_CLASS_RETURN(nil);
+    DECLARE_STATIC_METHOD_RETURN(sjm_getAccessibleComboboxValue, sjc_CAccessibility, "getAccessibleComboboxValue", "(Ljavax/accessibility/Accessible;Ljava/awt/Component;)Ljavax/accessibility/Accessible;", nil);
+    jobject axSelectedChild = (*env)->CallStaticObjectMethod(env, sjc_CAccessibility, sjm_getAccessibleComboboxValue, fAccessible, fComponent);
     CHECK_EXCEPTION();
-    if (axSelection == NULL) {
-        return nil;
-    }
-    jclass axSelectionClass = (*env)->GetObjectClass(env, axSelection);
-    DECLARE_METHOD_RETURN(jm_getAccessibleSelection, axSelectionClass, "getAccessibleSelection", "(I)Ljavax/accessibility/Accessible;", nil);
-    jobject axSelectedChild = (*env)->CallObjectMethod(env, axSelection, jm_getAccessibleSelection, 0);
-    CHECK_EXCEPTION();
-    (*env)->DeleteLocalRef(env, axSelection);
-    (*env)->DeleteLocalRef(env, axContext);
     if (axSelectedChild == NULL) {
         return nil;
     }
-    GET_ACCESSIBLENAME_METHOD_RETURN(nil);
-    jobject childName = (*env)->CallStaticObjectMethod(env, sjc_CAccessibility, sjm_getAccessibleName, axSelectedChild, fComponent);
-    CHECK_EXCEPTION();
-    if (childName == NULL) {
-        (*env)->DeleteLocalRef(env, axSelectedChild);
-        return nil;
-    }
-    NSString *selectedText = JavaStringToNSString(env, childName);
-    (*env)->DeleteLocalRef(env, axSelectedChild);
-    (*env)->DeleteLocalRef(env, childName);
-    return selectedText;
+    return [CommonComponentAccessibility createWithAccessible:axSelectedChild withEnv:env withView:fView];
+}
+
+// NSAccessibilityElement protocol methods
+
+- (id)accessibilityValue
+{
+    return [[self accessibleSelection] accessibilityLabel];
 }
 
 @end