src/java.desktop/unix/native/libawt_xawt/awt/awt_GraphicsEnv.c

@@ -2179,11 +2179,12 @@
  * Signature: (I)D
  */
 JNIEXPORT jdouble JNICALL
 Java_sun_awt_X11GraphicsDevice_getNativeScaleFactor
     (JNIEnv *env, jobject this, jint screen) {
-    char *name = get_output_screen_name(env, screen);
+    // in case of Xinerama individual screen scales are not supported
+    char *name = get_output_screen_name(env, usingXinerama ? 0 : screen);
     double scale = getNativeScaleFactor(name);
     if (name) {
         free(name);
     }
     return scale;