Gradle java lang nullpointerexception no error message

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java.lang.NullPointerException (no error message) for new project #603

java.lang.NullPointerException (no error message) for new project #603

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Description

$ create-react-native-app crna-test $ cd crna-test $ npm run eject # default selections chosen $ npm install $ react-native run-android 

fails with an error message

A problem occurred configuring project ':app'. > java.lang.NullPointerException (no error message) 

Expected Behavior

$ react-native run-android should run successfully on a new project

Observed Behavior

$ cd android/ $ ./gradlew build --debug 

gives this output (truncated to the error point)

16:17:09.777 [DEBUG] [com.android.build.gradle.internal.pipeline.TransformManager] InputStream: OriginalStream 16:17:09.777 [DEBUG] [com.android.build.gradle.internal.pipeline.TransformManager] InputStream: OriginalStream 16:17:09.777 [DEBUG] [com.android.build.gradle.internal.pipeline.TransformManager] InputStream: OriginalStream 16:17:09.777 [DEBUG] [com.android.build.gradle.internal.pipeline.TransformManager] OutputStream: IntermediateStream 16:17:09.778 [DEBUG] [org.gradle.model.internal.registry.DefaultModelRegistry] Project :app - Registering model element 'tasks.transformClassesWithDexForDebug' (hidden = false) 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception. 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong: 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] A problem occurred configuring project ':app'. 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] > java.lang.NullPointerException (no error message) 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] * Try: 16:17:09.793 [ERROR] [org.gradle.BuildExceptionReporter] Run with --stacktrace option to get the stack trace. 16:17:09.795 [LIFECYCLE] [org.gradle.BuildResultLogger] 16:17:09.795 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED 16:17:09.795 [LIFECYCLE] [org.gradle.BuildResultLogger] 16:17:09.795 [LIFECYCLE] [org.gradle.BuildResultLogger] Total time: 6.915 secs 

Environment

Please run these commands in the project folder and fill in their results:

• npm ls react-native-scripts : (empty)
• npm ls react-native : react-native@0.52.0
• npm ls expo : (empty)
• node -v : v8.3.0
• npm -v : 5.6.0
• yarn —version : 0.21.3
• watchman version : «version»: «4.7.0»

Reproducible Demo

The text was updated successfully, but these errors were encountered:

Источник

How to fix execution failed for task ‘:app:minifyreleasewithr8’.java.lang.nullpointerexception (no error message) in Android?

The «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message?)» error occurs when building a release version of an Android app using Gradle. This error usually occurs due to an issue with the R8 code shrinker which is used to optimize and reduce the size of the APK file. The error message «java.lang.NullPointerException (no error message?)» indicates that a null reference has been encountered during the build process.

Method 1: Update Gradle and Gradle Plugins

To fix the error «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» in Android, you can update Gradle and Gradle Plugins. Here are the steps:

1. Open your project in Android Studio.
2. In the «Project» pane, go to the «Gradle Scripts» folder and open the «build.gradle (Project)» file.
3. In the «buildscript» section, update the Gradle version to the latest version. For example:

1. In the «build.gradle (Module)» file, update the Gradle Plugin version to the latest version. For example:

apply plugin: 'com.android.application' android < compileSdkVersion 30 buildToolsVersion "30.0.2" defaultConfig < applicationId "com.example.myapp" minSdkVersion 21 targetSdkVersion 30 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" >buildTypes < release < minifyEnabled true proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' >> > dependencies < implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.2.0' implementation 'com.google.android.material:material:1.2.1' implementation 'androidx.constraintlayout:constraintlayout:2.0.4' testImplementation 'junit:junit:4.+' androidTestImplementation 'androidx.test.ext:junit:1.1.2' androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0' >// Update this line dependencies

1. Sync your project with Gradle by clicking on the «Sync Now» button in the toolbar or by going to «File» > «Sync Project with Gradle Files».

After updating Gradle and Gradle Plugins, try running your project again. This should fix the «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» error.

Method 2: Check for corrupt dependencies

One of the reasons for the error message «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» in Android could be due to corrupt dependencies. To check for corrupt dependencies, follow the below steps:

1. Open the build.gradle file of your project.
2. Look for the dependencies block and add the following code:

configurations.all < resolutionStrategy.eachDependency < DependencyResolveDetails details ->def requested = details.requested if (requested.group == 'com.android.support') < if (!requested.name.startsWith("multidex")) < details.useVersion '27.1.1' >> > >

This should fix the issue caused by corrupt dependencies. If the issue persists, you can try cleaning the project and rebuilding it.

Method 3: Disable R8 Shrinker

To fix the error «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» in your Android app, you can disable R8 shrinker. Here’s how to do it:

The shrinkResources false line disables R8 shrinker, which should fix the NullPointerException error. The proguardFiles line specifies the ProGuard rules file to use for code shrinking and obfuscation.

Make sure to test your app thoroughly after disabling R8 shrinker, as it may affect app performance and size.

Method 4: Add Exception for the Library Causing Error

To add an exception for the library causing the error in Android, you can follow these steps:

1. Open your app’s build.gradle file.
2. Locate the minifyEnabled option and set it to false :

-keep class com.example.library.**

Here is an example proguard-rules.pro file that includes an exception for the Gson library:

This will prevent R8 from removing any classes or methods from the Gson library during code shrinking.

Note that adding too many exceptions can reduce the effectiveness of code shrinking and increase the size of your APK. Only add exceptions for libraries that are causing errors and are essential to your app’s functionality.

Method 5: Clean and Rebuild the Project

To fix the error «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» in Android with «Clean and Rebuild the Project», follow these steps:

1. Clean the project by going to Build > Clean Project in Android Studio or running the following command in the terminal:

1. Rebuild the project by going to Build > Rebuild Project in Android Studio or running the following command in the terminal:

1. Check the build output for any errors or warnings. If there are any, fix them before proceeding.
2. Run the project again and see if the error has been resolved.

Here is an example of how to clean and rebuild the project in Kotlin:

// Clean the project project.tasks.getByName("clean").doLast  println("Cleaning project. ") > // Rebuild the project project.tasks.getByName("assembleRelease").doLast  println("Building project. ") >

And here is an example of how to do it in Groovy:

// Clean the project task clean(type: Delete)  delete rootProject.buildDir println "Cleaning project. " > // Rebuild the project task rebuild(type: GradleBuild)  tasks = ['assembleRelease'] println "Building project. " >

By following these steps and examples, you should be able to fix the error «Execution failed for task ‘:app:minifyReleaseWithR8’.java.lang.NullPointerException (no error message)» in Android with «Clean and Rebuild the Project».

Источник