React Native (Android) - cannot find symbol class ReactInstanceManager

Question

I just upgraded to React Native 0.63.3.....I also upgraded Android studio to 4.1.1 and gradle plugin to 4.1.0.
Im getting the error cannot find symbol class ReactInstanceManager when I try to build.

The error is in file MainApplication.java.....see code below.
Appears the error is with the line initializeFlipper(this,getReactNativeHost().getReactInstanceManager());. It seems to be saying that Im providing com.facebook.react.ReactInstanceManager....but what the program wants is ReactInstanceManager.
It says Get the current ReactInstanceManager instance, or create one.

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
    initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
  }

  /**
   * Loads Flipper in React Native templates. Call this in the onCreate method with something like
   * initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
   *
   * @param context
   * @param reactInstanceManager
   */
  private static void initializeFlipper(
      Context context, ReactInstanceManager reactInstanceManager) {
    if (BuildConfig.DEBUG) {
      try {
        /*
         * We use reflection here to pick up the class that initializes Flipper, since
         * Flipper library is not available in release mode
         */
        Class<?> aClass = Class.forName("com.xs.ReactNativeFlipper");
        aClass
            .getMethod("initializeFlipper", Context.class, ReactInstanceManager.class)
            .invoke(null, context, reactInstanceManager);
      } catch (ClassNotFoundException e) {

james murphy · Accepted Answer · 2021-01-22 04:00:42Z

14

I missed a single line of code during my upgrgade of RN from 0.61.5 to 0.63.3.
import com.facebook.react.ReactInstanceManager; was missing from MainApplication.java

answered Jan 22, 2021 at 4:00

james murphy

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Comments

Jeremy Caney · Accepted Answer · 2023-10-15 01:04:14Z

4

Make sure you have same package name as in your MainApplication.java.

Example :

package com.appname;

For same in:

android/app/src/debug/java/com/appname/ReactNativeFlipper.java

and in

android/app/src/release/java/com/appname/ReactNativeFlipper.java

This solved my issue since I have changed my package name.

edited Oct 15, 2023 at 1:04

Jeremy Caney

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answered Oct 7, 2023 at 13:20

Ramajeyam R

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Comments

Nemanja Pavlović · Accepted Answer · 2023-05-11 08:49:48Z

2

Not an ideal solution, but it worked for me:

I created file ReactNativeFlipper.java in android/app/src/main/java/com/myProject/ and put this code inside:

package com.myProject;
import android.content.Context;
import com.facebook.react.ReactInstanceManager;
public class ReactNativeFlipper {
  public static void initializeFlipper(Context context, ReactInstanceManager reactInstanceManager) {
    // Do nothing as we don't want to initialize Flipper on Release.
  }
}

Reference: https://github.com/facebook/react-native/issues/36060

Note: Don't forget to change myProject to your project's name

answered May 11, 2023 at 8:49

Nemanja Pavlović

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1 Comment

famfamfam Over a year ago

I saw we need put to release folder, not src folder

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