Execution failed for task ':app:compileDebugJavaWithJavac'. react-native

Question

Could not find the "expo" package in your project when configuring the packager Starting JS server... Building and installing the app on the device (cd android && ./gradlew installDebug)...

Task :app:compileDebugJavaWithJavac FAILED /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:5: error: cannot find symbol import com.facebook.react.ReactApplication; ^ symbol: class ReactApplication location: package com.facebook.react /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:6: error: cannot find symbol import com.facebook.react.ReactNativeHost; ^ symbol: class ReactNativeHost location: package com.facebook.react /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:14: error: cannot find symbol public class MainApplication extends Application implements ReactApplication { ^ symbol: class ReactApplication /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:16: error: cannot find symbol private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { ^ symbol: class ReactNativeHost location: class MainApplication /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:36: error: cannot find symbol public ReactNativeHost getReactNativeHost() { ^ symbol: class ReactNativeHost location: class MainApplication /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainActivity.java:5: error: MainActivity is not abstract and does not override abstract method getPackages() in ReactActivity public class MainActivity extends ReactActivity { ^ /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:16: error: cannot find symbol private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { ^ symbol: class ReactNativeHost location: class MainApplication /media/rahul/OTHER FILES/mob/first/android/app/src/main/java/com/practice/MainApplication.java:35: error: method does not override or implement a method from a supertype @Override ^ 8 errors

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:compileDebugJavaWithJavac'.

  Compilation failed; see the compiler error output for details.

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 22s 15 actionable tasks: 14 executed, 1 up-to-date Could not install the app on the device, read the error above for details. Make sure you have an Android emulator running or a device connected and have set up your Android development environment: https://facebook.github.io/react-native/docs/getting-started.html

i am setting up react-native project for first time please check if i am following steps correctly? 1. create-react-native-app first 2. npm run eject 3. opening android studio and then simulator 4. react-native run-android but getting error as above.

Answer 1

This error occur because you RN version is different from Android's build.gradle version. When you create a react-native app probably it create android app like:

android/app/build.gradle

implementation "com.facebook.react:react-native:+"

So, inspect you node_modules folder, look for react-native folder and look for a folder with a number, that numbers are react-native version. For me it's 0.58.3 then update android/app/build.gradle:

implementation "com.facebook.react:react-native:0.58.3"

It's All.

Answer 2

You should provide more info. The error you've posted is not very helpful.

Without more info, you could try to:

cd android && ./gradlew clean

and see if it helps.

Answer 3

For what it's worth, I ended here googling my similar compile problem and the issue was that an OS update had wiped Java JDK from my path. Fixing that solved the issue.

Answer 4

If you are here because of this React Native error:

> Task :react-native-community_toolbar-android:compileDebugJavaWithJavac FAILED

The solution is updating the @react-native-community/toolbar-android to version 0.2.1