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I am trying to run react native app on my android device like this in cmd

cd C:\Users\User\Desktop\js

react-native run-android

FAILURE: Build failed with an exception.

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

    Could not find tools.jar

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

BUILD FAILED

Total time: 5.243 secs 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/android-setup.html

Can anyone please tell me how to fix this problem?

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11
  • have you cleaned your gradle and tried to run it again? Commented Oct 16, 2017 at 12:34
  • @stutikasliwal but I haven't create an android app,do I need to do that? Commented Oct 16, 2017 at 12:35
  • you are running android command that means you wrote for android, right? Commented Oct 16, 2017 at 12:41
  • That's react native folder with index.android,node_modules and etc. Commented Oct 16, 2017 at 12:43
  • yeah cd android & ./gradlew clean try to run this from your cmd Commented Oct 16, 2017 at 12:45

5 Answers 5

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5

Use the following step once, it may help you:

step 1: open cmd through administrator

step 2: navigate to your application by cd <path to your project>

step 3: run this command: ./gradlew clean

step 4: react-native run-android

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3 Comments

./gradlew clean
it say there is no such command
you have to go to android folder in the root of your project
0

Have you installed JDK and Android SDK properly? Are the JAVA_HOME and ANDROID_HOME properly placed in your environment variables?

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8 Comments

how can I check that?
I assume You are on Windows, then look for it like this: "Open the System pane under System and Security in the Control Panel, then click on Change settings.... Open the Advanced tab and click on Environment Variables" if you see ANDROID_HOME and it's pointing to your android SDK location it's ok. Same applies to JAVA_HOME
there is only ANDROID_HOME
Could you please try write java -version and javac -version to commandline? What's the result?
This verification helped me, I realized that in my case, the JAVA_HOME variable was missing, so this must be the first verification before attempting other solutions
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I faced this issue while working on react-native project on Linux. In my case issue occured because I linked some external plugin and then removed it without unlink. In that case you can attentively read your console error message. It should point to place that source an error.

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0

The solution if ur version of react-native >= 0.61.0. It shows error as when we add any plugin and use link command then it makes changes in android and ios folder. But when we remove plugin, it gets removed from package.json but inside android changes are not reverted and it gives error. So use below command to generate android folder again. I hope it will solve the error-

sudo rm -rf android/ ios/

yarn add react-native-eject

npx react-native eject
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0

If you are working with react native, just make sure you set up environment variables correctly for java compiler. after this goto package.json file in your project:

change this:

"react-native": "https://github.com/expo/react-native/archive/sdk-31.0.0.tar.gz",

to: "react-native": "0.57.5",

save and run npm install

Source: https://github.com/facebook/react-native/issues/21722

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