fix(android): log missing generated setter at debug level, not warn

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewManagerPropertyUpdater.kt

@@ -135,7 +135,9 @@ public object ViewManagerPropertyUpdater {
       @Suppress("DEPRECATION", "UNCHECKED_CAST")
       return setterClass.newInstance() as T
     } catch (e: ClassNotFoundException) {
-      FLog.w(TAG, "Could not find generated setter for $cls")
+      // A generated setter is optional: the annotation processor that produced them was removed,
+      // so reaching the reflection-based fallback is the expected path, not a problem.
+      FLog.d(TAG, "Could not find generated setter for $cls")
       return null
     } catch (e: InstantiationException) {
       throw RuntimeException("Unable to instantiate methods getter for $clsName", e)

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/ViewManagerPropertyUpdaterTest.kt

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.uimanager
+
+import android.view.View
+import com.facebook.common.logging.FLog
+import com.facebook.react.internal.featureflags.ReactNativeFeatureFlagsForTests
+import com.facebook.react.uimanager.annotations.ReactProp
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mockito.mockStatic
+import org.mockito.Mockito.never
+import org.mockito.kotlin.any
+import org.robolectric.RobolectricTestRunner
+
+/** Tests for the setter lookup done by [ViewManagerPropertyUpdater]. */
+@RunWith(RobolectricTestRunner::class)
+class ViewManagerPropertyUpdaterTest {
+  @Suppress("DEPRECATION")
+  private class ViewManagerWithoutGeneratedSetter : ViewManager<View, ReactShadowNode<*>>() {
+    override fun getName() = "ViewManagerWithoutGeneratedSetter"
+
+    override fun createShadowNodeInstance(): ReactShadowNode<*> =
+        error("This method should not be executed as a part of this test")
+
+    override fun getShadowNodeClass(): Class<out ReactShadowNode<*>> = ReactShadowNode::class.java
+
+    override fun createViewInstance(reactContext: ThemedReactContext): View =
+        error("This method should not be executed as a part of this test")
+
+    override fun prepareToRecycleView(reactContext: ThemedReactContext, view: View): View? =
+        error("This method should not be executed as a part of this test")
+
+    override fun updateExtraData(view: View, extraData: Any) =
+        error("This method should not be executed as a part of this test")
+
+    @ReactProp(name = "someProp") fun setSomeProp(view: View?, value: Boolean) = Unit
+  }
+
+  @Before
+  fun setUp() {
+    ReactNativeFeatureFlagsForTests.setUp()
+    // Setters are cached per class, so the lookup would be skipped if an earlier test ran it.
+    ViewManagerPropertyUpdater.clear()
+  }
+
+  @Test
+  fun missingGeneratedSetterFallsBackToReflectionWithoutWarning() {
+    mockStatic(FLog::class.java).use { flog ->
+      val nativeProps = ViewManagerWithoutGeneratedSetter().nativeProps
+
+      assertThat(nativeProps).containsKey("someProp")
+      flog.verify({ FLog.w(any<String>(), any<String>()) }, never())
+    }
+  }
+}