# Gradle publish gives "java.lang.NullPointerException" error? **URL:** \ **Category:** Help/Discuss\ **Created:** [September 6, 2025, 4:27pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554 "2025-09-06T16:27:58Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![ZillaG](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZillaG](https://discuss.gradle.org/u/ZillaG)\ **Post date:** [September 6, 2025, 4:27pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/1 "2025-09-06T16:27:58Z")
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. ```gradle 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 ```gradle rootProject.name = 'all-my-microservice' include 'my-microservice', 'my-microservice-client' ``` Here’s the `publishing` part `my-microservice/my-microservice/build.gradle` ```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. ```gradle $ ./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 ```gradle $ 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 ``` ---
**Author:** ![Vampire](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/vampire/32/9082_2.png) [@Vampire](https://discuss.gradle.org/u/Vampire)\ **Post date:** [September 7, 2025, 11:04am UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/2 "2025-09-07T11:04:12Z")
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. ---
**Author:** ![ZillaG](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZillaG](https://discuss.gradle.org/u/ZillaG)\ **Post date:** [September 7, 2025, 2:04pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/3 "2025-09-07T14:04:51Z")
You’re correct. Here’s the stack trace. Thanks! ```gradle * 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 ``` ---
**Author:** ![ZillaG](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZillaG](https://discuss.gradle.org/u/ZillaG)\ **Post date:** [September 7, 2025, 2:17pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/4 "2025-09-07T14:17:05Z")
I added this task in the the `my-microservice/my-microservice/build.gradle` file ```gradle 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. ```gradle $ ./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 ``` ---
**Author:** ![Vampire](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/vampire/32/9082_2.png) [@Vampire](https://discuss.gradle.org/u/Vampire)\ **Post date:** [September 8, 2025, 3:08am UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/5 "2025-09-08T03:08:48Z")
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. ---
**Author:** ![ZillaG](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZillaG](https://discuss.gradle.org/u/ZillaG)\ **Post date:** [September 8, 2025, 1:40pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/6 "2025-09-08T13:40:39Z")
Thanks. I’m confused because I don’t have `credentials` in the sub-project’s `build.gradle` that I shared. If I remove it ```gradle 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. ```gradle $ ./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? ```gradle $ !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? ---
**Author:** ![Vampire](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/vampire/32/9082_2.png) [@Vampire](https://discuss.gradle.org/u/Vampire)\ **Post date:** [September 8, 2025, 3:29pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/7 "2025-09-08T15:29:16Z")
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](https://github.com/gradle/gradle/blob/v6.5.1/subprojects/dependency-management/src/main/java/org/gradle/api/internal/artifacts/repositories/transport/RepositoryTransportFactory.java#L166) And if I set credentials then I can produce the exact same stacktrace with exact same line numbers that you showed. ---
**Author:** ![Vampire](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/vampire/32/9082_2.png) [@Vampire](https://discuss.gradle.org/u/Vampire)\ **Post date:** [September 8, 2025, 5:15pm UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/8 "2025-09-08T17:15:55Z")
> 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. ---
**Author:** ![ZillaG](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZillaG](https://discuss.gradle.org/u/ZillaG)\ **Post date:** [September 9, 2025, 12:46am UTC](https://discuss.gradle.org/t/gradle-publish-gives-java-lang-nullpointerexception-error/51554/9 "2025-09-09T00:46:45Z")
Thanks so much for your help. I have configuration issues with this project indeed. I’ll open another discussion for them.