I cleaned the whole project by deleting local directories like ~/.gradle
, ~/.m2
~./android
and ~/workspace/project/.gradle
and chosing File -> Invalidate Caches / Restart...
in Android Studio.
Now execution of the command ./gradlew
leads to the following output:
usr$ ./gradlew tasks
Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain
Needless to say, I deleted too much, the question is how can it be repaired again? Do you have any ideas how to fix this?
Your gradle wrapper is missing, broken or corrupted.
--
What is gradle wrapper:
gradlew
is the gradle wrapper executable - batch script on windows and shell script elsewhere. The wrapper script when invoked, downloads the defined gradle version and executes it. By distributing the wrapper with your project, anyone can work with it without needing to install Gradle beforehand. Even better, users of the build are guaranteed to use the version of Gradle that the build was designed to work with.
--
Restoring gradle wrapper:
It used to be that you needed to add a wrapper
task to your build.gradle
to restore gradle wrapper and all its dependencies. For instance in build.gradle
:
task wrapper(type: Wrapper) {
gradleVersion = '4.1'
}
Or in build.gradle.kts
:
tasks.register<Wrapper>("wrapper") {
gradleVersion = "4.1"
}
Newer versions of gradle do not require this. It is now a built-in task. Just run:
gradle wrapper
You can also supply additional flags to specify versions etc
gradle wrapper --gradle-version 6.2 --distribution-type all
When you run this task, a gradle wrapper script, and the required jar files are added to your source folders. Properties are stored in gradle/wrapper/gradle-wrapper.properties
(You may need to install gradle locally to run this. brew install gradle
on mac for instance. See more detailed instructions here)
--
Why was it missing in the first place?
OP seems to have deleted something that gradle wrapper depends on.
But a common reason is that a .gitignore entry prevents wrapper jars from being checked into git. Note that the .gitignore in effect may be in the source folder, or a global one in your user home folder or git global configuration. It is common to have a *.jar
entry in .gitignore.
You can add an exception for gradlew's jar files in .gitignore
*.jar
!gradle/wrapper/gradle-wrapper.jar
or force add the wrapper jar into git
git add -f gradle/wrapper/gradle-wrapper.jar
--
Ref: Gradle Wrapper