Gradle publish gives "java.lang.NullPointerException" error?

Help/Discuss
1

Gradle v6.5 (old, but we can’t quite update to latest Gradle version).

I have a Gradle project with 2 sub-projects, with the following folder structure, showing their respective build.gradle files.

my-microservice/build.gradle
my-microservice/my-microservice/build.gradle
my-microservice/my-microservice-client/build.gradle

Here’s the top-level settings.gradle file

rootProject.name = 'all-my-microservice'
include 'my-microservice', 'my-microservice-client'

Here’s the publishing part my-microservice/my-microservice/build.gradle

 buildZipFull(type: Zip) {
    from processResources
    from compileJava
    into('lib') {
        from(configurations.compileClasspath) {
            exclude 'tomcat-embed-*'
        }
    }
    into('lib') {
        from libsDir
        include '*.jar'
    }
}
build.dependsOn buildZipFull

publishing {
    apply plugin: "maven-publish"
    publications {
        mavenJava(MavenPublication) {
            artifact buildZipFull  // Ensure this artifact is used for publishing

            groupId = project.group
            artifactId = project.artifactId
            version = project.version
        }
    }
    repositories {
        maven {
            url 's3://' + s3_bucket
            authentication {
                awsIm(AwsImAuthentication)
            }
        }
    }
}

From the top-level directory of the project, I run the publish task, and do get a JAR file, but I get an exception when publishing.

$ ./gradlew clean build publish -p my-microservice
...
> Task :my-microservice:processResources NO-SOURCE
> Task :my-microservice:testClasses
> Task :my-microservice:test
> Task :my-microservice:check
> Task :my-microservice:build
> Task :my-microservice:generateMetadataFileForMyMicroservicePublication
> Task :my-microservice:generatePomFileForMyMicroservicePublication
> Task :my-microservice:publishMyMicroservicePublicationToMaven2Repository FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':my-microservice:publishMyMicroservicePublicationToMaven2Repository'.
> Failed to publish publication 'myMicroservice' to repository 'maven2'
   > java.lang.NullPointerException (no error message)

Again I see

$ pwd
/Users/suer1/git-repos/company/my-submodules/my-microservice (top-level folder)

$ find . -name *.jar
./gradle/wrapper/gradle-wrapper.jar
./my-microservice/build/libs/my-microservice-3.0.0.jar
2

Did you do what the error recommends?
If yes, why don’t you share the additional information, if not why not?

Please at least share the full --stacktrace, or much better if possible, a build --scan URL.

3

You’re correct. Here’s the stack trace. Thanks!


* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':my-microservice:publishLambdaRunnerPublicationToMaven2Repository'.
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:207)
  at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:205)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:186)
  at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:114)
  at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
  at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
  at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:409)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:399)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:94)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
  at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:356)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
  at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
  at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
  at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: org.gradle.api.artifacts.PublishException: Failed to publish publication 'myMicroservice' to repository 'maven2'
  at org.gradle.api.publish.internal.PublishOperation.run(PublishOperation.java:39)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository.doPublish(PublishToMavenRepository.java:79)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository.publish(PublishToMavenRepository.java:68)
  at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:49)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:42)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:726)
  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:693)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.run(ExecuteActionsTaskExecuter.java:569)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:395)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:387)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:84)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:554)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:537)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:108)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:278)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:267)
  at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$1(ExecuteStep.java:33)
  at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:33)
  at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
  at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:67)
  at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:36)
  at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:49)
  at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:34)
  at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:43)
  at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
  at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
  at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
  at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:44)
  at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:54)
  at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:38)
  at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
  at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:159)
  at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:72)
  at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:43)
  at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:44)
  at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:33)
  at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
  at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:92)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:85)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39)
  at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:76)
  at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
  at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:94)
  at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49)
  at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:79)
  at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:53)
  at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:78)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:78)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:39)
  at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:40)
  at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:28)
  at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:194)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:186)
  at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:114)
  at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
  at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
  at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:409)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:399)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:94)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
  at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:356)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
  at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
  at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
  at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: java.lang.NullPointerException
  at org.gradle.internal.authentication.AbstractAuthentication.supports(AbstractAuthentication.java:64)
  at org.gradle.api.internal.artifacts.repositories.transport.RepositoryTransportFactory.validateConnectorFactoryCredentials(RepositoryTransportFactory.java:167)
  at org.gradle.api.internal.artifacts.repositories.transport.RepositoryTransportFactory.createTransport(RepositoryTransportFactory.java:116)
  at org.gradle.api.internal.artifacts.repositories.transport.RepositoryTransportFactory.createTransport(RepositoryTransportFactory.java:107)
  at org.gradle.api.internal.artifacts.repositories.DefaultMavenArtifactRepository.getTransport(DefaultMavenArtifactRepository.java:339)
  at org.gradle.api.publish.maven.internal.publisher.MavenRemotePublisher.publish(MavenRemotePublisher.java:57)
  at org.gradle.api.publish.maven.internal.publisher.ValidatingMavenPublisher.publish(ValidatingMavenPublisher.java:50)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository$1.publish(PublishToMavenRepository.java:77)
  at org.gradle.api.publish.internal.PublishOperation.run(PublishOperation.java:37)
  ... 94 more
4

I added this task in the the my-microservice/my-microservice/build.gradle file

tasks.register('printArtifactsToPublish') {
    doLast {
        publishing.publications.each { pub ->
            println "Publication: ${pub.name}"
            pub.artifacts.each { artifact ->
                println " - Artifact: ${artifact.file} (type: ${artifact.class.simpleName})"
            }
        }
    }
}

And see this when I execute the task. Those are my expected artifacts.

$ ./gradlew printArtifactsToPublish -p my-microservice

> Task :my-microservice:printArtifactsToPublish
Publication: myMicroservice
Maven publication 'myMicroservice' pom metadata warnings (silence with 'suppressPomMetadataWarningsFor(variant)'):
  - Variant apiElements:
      -  contains dependencies that will produce a pom file that cannot be consumed by a Maven client.
          - com.company.xray:company-xray:+ declared with a Maven incompatible version notation
          - com.company.common:company-common:+ declared with a Maven incompatible version notation
          - com.company.service:service-discovery:1.0.+ declared with a Maven incompatible version notation
  - Variant runtimeElements:
      -  contains dependencies that will produce a pom file that cannot be consumed by a Maven client.
          - com.blacklocus:metrics-cloudwatch:+ declared with a Maven incompatible version notation
These issues indicate information that is lost in the published 'pom' metadata file, which may be an issue if the published library is consumed by an old Gradle version or Apache Maven.
The 'module' metadata file, which is used by Gradle 6+ is not affected.
 - Artifact: /Users/user/git-repos/company/company-submodules/my-microservice/my-microservice/build/libs/my-microservice-3.0.0.jar (type: PublishArtifactBasedMavenArtifact_Decorated)
Publication: mavenJava
 - Artifact: /Users/user/git-repos/company/company-submodules/my-microservice/my-microservice/build/distributions/my-microservice-3.0.0.zip (type: ArchiveTaskBasedMavenArtifact_Decorated)

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.5/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 744ms
1 actionable task: 1 executed
5

You stracktrace shows, that for the AwsImAuthentication you also have set credentials, which it does not support. That an NPE is thrown imho is a bug you should report though. But still it is a misconfiguration.

6

Thanks. I’m confused because I don’t have credentials in the sub-project’s build.gradle that I shared. If I remove it

publishing {
    apply plugin: "maven-publish"
    publications {
        mavenJava(MavenPublication) {
            artifact buildZipFull  // Ensure this artifact is used for publishing

            groupId = project.group
            artifactId = project.artifactId
            version = project.version
        }
    }
//    repositories {
//        maven {
//            url 's3://' + s3_bucket
//            authentication {
//                awsIm(AwsImAuthentication)
//            }
//        }
//    }
}

It tells me I don’t have the JAR file it needs.

$ ./gradlew clean build publish -x test -p my-microservice --stacktrace
...
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':my-microservice:publishMyMicroservicePublicationToMavenRepository'.
> Failed to publish publication 'myMicroservice' to repository 'maven'
   > Artifact my-microservice-3.0.0.jar wasn't produced by this build.

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':my-microservice:publishMyMicroservicePublicationToMavenRepository'.
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:207)
  at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:205)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:186)
  at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:114)
  at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
  at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
  at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:409)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:399)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:94)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
  at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:356)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
  at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
  at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
  at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: org.gradle.api.artifacts.PublishException: Failed to publish publication 'myMicroservice' to repository 'maven'
  at org.gradle.api.publish.internal.PublishOperation.run(PublishOperation.java:39)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository.doPublish(PublishToMavenRepository.java:79)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository.publish(PublishToMavenRepository.java:68)
  at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:49)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:42)
  at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:726)
  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:693)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.run(ExecuteActionsTaskExecuter.java:569)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:395)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:387)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:84)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:554)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:537)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:108)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:278)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:267)
  at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$1(ExecuteStep.java:33)
  at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:33)
  at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
  at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:67)
  at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:36)
  at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:49)
  at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:34)
  at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:43)
  at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
  at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
  at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
  at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:44)
  at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:54)
  at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:38)
  at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
  at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:159)
  at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:72)
  at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:43)
  at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:44)
  at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:33)
  at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
  at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:92)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:85)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)
  at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39)
  at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:76)
  at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
  at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:94)
  at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49)
  at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:79)
  at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:53)
  at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:78)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:78)
  at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34)
  at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:39)
  at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:40)
  at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:28)
  at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:194)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:186)
  at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:114)
  at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
  at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
  at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:409)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:399)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:157)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:242)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:150)
  at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:94)
  at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
  at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:356)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
  at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
  at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
  at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: java.lang.IllegalStateException: Artifact my-microservice-3.0.0.jar wasn't produced by this build.
  at org.gradle.api.publish.maven.internal.publisher.MavenNormalizedPublication.getMainArtifact(MavenNormalizedPublication.java:87)
  at org.gradle.api.publish.maven.internal.publisher.AbstractMavenPublisher.publish(AbstractMavenPublisher.java:79)
  at org.gradle.api.publish.maven.internal.publisher.MavenRemotePublisher.publish(MavenRemotePublisher.java:62)
  at org.gradle.api.publish.maven.internal.publisher.ValidatingMavenPublisher.publish(ValidatingMavenPublisher.java:50)
  at org.gradle.api.publish.maven.tasks.PublishToMavenRepository$1.publish(PublishToMavenRepository.java:77)
  at org.gradle.api.publish.internal.PublishOperation.run(PublishOperation.java:37)
  ... 94 more

But clearly I do?

$ !find
find . -name "*.jar"
./gradle/wrapper/gradle-wrapper.jar
./lambda-runner-client/build/libs/my-microservice-client-3.0.0.jar
./lambda-runner/build/libs/my-microservice-3.0.0.jar

It can mean that even though I generate the artifact, Gradle doesn’t see it as a valid output? How come?

7

Somehow you do have credentials set.
Maybe you apply some plugin or init script that sets it.
Without credentials set this NPE is not possible as the code path is guarded by if (credentials != null) {: gradle/subprojects/dependency-management/src/main/java/org/gradle/api/internal/artifacts/repositories/transport/RepositoryTransportFactory.java at v6.5.1 · gradle/gradle · GitHub
And if I set credentials then I can produce the exact same stacktrace with exact same line numbers that you showed.

8

It can mean that even though I generate the artifact, Gradle doesn’t see it as a valid output? How come?

I’m sorry, but I can hardly guess how you misconfigured things without seeing the build. That the file is there on disk does not mean that the build run produced it. Also this is a is at when before you tried to publish a zip. And that you still can invoke that task at all also shows that somewhere a publishing repository with that same name is coming from where probably credentials are set which produced the previous NPE problem.

9

Thanks so much for your help. I have configuration issues with this project indeed. I’ll open another discussion for them.

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