Fix NullPointerException thrown on startup (#43293)

Summary:
Pull Request resolved: #43293

Was debugging this, and found that this exception was being thrown due to `DefaultBindingsInstaller`, which was an invalid hybrid object. The ReactInstance initializer fully supports this being null, so let's use that as default.

Changelog: [Android][Fixed] NullPointerException is no longer ignored in MessageQueueThreadHandler

Reviewed By: sammy-SC

Differential Revision: D54434417

fbshipit-source-id: 52417b390061eface0f0578e32796d3a85303e03

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/queue/MessageQueueThreadHandler.java

@@ -10,8 +10,6 @@
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
-import com.facebook.common.logging.FLog;
-import com.facebook.react.common.ReactConstants;
 
 /** Handler that can catch and dispatch Exceptions to an Exception handler. */
 public class MessageQueueThreadHandler extends Handler {
@@ -28,15 +26,6 @@ public void dispatchMessage(Message msg) {
     try {
       super.dispatchMessage(msg);
     } catch (Exception e) {
-      if (e instanceof NullPointerException) {
-        FLog.e(
-            ReactConstants.TAG,
-            "Caught NullPointerException when dispatching message in MessageQueueThreadHandler. This is likely caused by runnable"
-                + "(msg.callback) being nulled in Android Handler after dispatching and before handling (see T170239922 for more details)."
-                + "Currently we observe that it only happen once which is during initialisation. Due to fixing probably involve Android "
-                + "System code, we decide to ignore here for now and print an error message for debugging purpose in case this cause more serious issues in future.");
-        return;
-      }
       mExceptionHandler.handleException(e);
     }
   }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/defaults/DefaultReactHostDelegate.kt

@@ -43,7 +43,7 @@ public class DefaultReactHostDelegate(
     override val jsBundleLoader: JSBundleLoader,
     override val reactPackages: List<ReactPackage> = emptyList(),
     override val jsRuntimeFactory: JSRuntimeFactory = HermesInstance(),
-    override val bindingsInstaller: BindingsInstaller = DefaultBindingsInstaller(),
+    override val bindingsInstaller: BindingsInstaller? = null,
     private val reactNativeConfig: ReactNativeConfig = ReactNativeConfig.DEFAULT_CONFIG,
     private val exceptionHandler: (Exception) -> Unit = {},
     override val turboModuleManagerDelegateBuilder: ReactPackageTurboModuleManagerDelegate.Builder

packages/react-native/ReactAndroid/src/main/jni/react/jni/JMessageQueueThread.cpp

@@ -10,7 +10,6 @@
 #include <condition_variable>
 #include <mutex>
 
-#include <fb/log.h>
 #include <fbjni/NativeRunnable.h>
 #include <fbjni/fbjni.h>
 #include <jsi/jsi.h>

packages/react-native/ReactAndroid/src/main/jni/react/jni/JMessageQueueThread.h

@@ -42,10 +42,6 @@ class JMessageQueueThread : public MessageQueueThread {
    */
   void quitSynchronous() override;
 
-  JavaMessageQueueThread::javaobject jobj() {
-    return m_jobj.get();
-  }
-
  private:
   jni::global_ref<JavaMessageQueueThread::javaobject> m_jobj;
 };