Following this doc [1] and trying to upload work item handler into business-central, it fails with:

~~~
09:09:08,579 INFO [org.guvnor.m2repo.backend.server.M2Servlet] (default task-6) POST request received.
09:09:11,567 ERROR [io.undertow.request] (default task-6) UT005023: Exception handling request to /business-central/maven2: java.lang.RuntimeException: org.eclipse.aether.deployment.DeploymentException: Failed to deploy artifacts: Could not transfer artifact org.jbpm.contrib:FailedDeployment:jar:7.33.0.Final-redhat-00002 from/to jboss-releases-repository (https://repository.jboss.org/nexus/service/local/staging/deploy/maven2/): Unauthorized (401)
at org.guvnor.m2repo.backend.server.repositories.DistributionManagementArtifactRepository.deploy(DistributionManagementArtifactRepository.java:145)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:38)
at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106)
at org.guvnor.m2repo.backend.server.repositories.ArtifactRepository$870664176$Proxy$_$$_WeldClientProxy.deploy(Unknown Source)
at org.guvnor.m2repo.backend.server.GuvnorM2Repository.lambda$deployArtifact$4(GuvnorM2Repository.java:307)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at org.guvnor.m2repo.backend.server.GuvnorM2Repository.deployArtifact(GuvnorM2Repository.java:307)
at org.guvnor.m2repo.backend.server.GuvnorM2Repository.deployArtifact(GuvnorM2Repository.java:181)
at org.guvnor.m2repo.backend.server.GuvnorM2Repository.deployArtifact(GuvnorM2Repository.java:146)
at org.guvnor.m2repo.backend.server.GuvnorM2Repository$Proxy$_$$_WeldClientProxy.deployArtifact(Unknown Source)
at org.guvnor.m2repo.backend.server.M2RepoServiceImpl.deployJar(M2RepoServiceImpl.java:80)
at org.guvnor.m2repo.backend.server.M2RepoServiceImpl$Proxy$_$$_WeldClientProxy.deployJar(Unknown Source)
at org.guvnor.m2repo.backend.server.helpers.HttpPostHelper.deploy(HttpPostHelper.java:183)
at org.guvnor.m2repo.backend.server.helpers.HttpPostHelper.uploadJar(HttpPostHelper.java:167)
at org.guvnor.m2repo.backend.server.helpers.HttpPostHelper.upload(HttpPostHelper.java:123)
at org.guvnor.m2repo.backend.server.helpers.HttpPostHelper.handle(HttpPostHelper.java:64)
at org.guvnor.m2repo.backend.server.M2Servlet.doPost(M2Servlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:706)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:791)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.uberfire.ext.security.server.BasicAuthSecurityFilter.doFilter(BasicAuthSecurityFilter.java:105)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.uberfire.ext.security.server.SecureHeadersFilter.doFilter(SecureHeadersFilter.java:110)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.uberfire.ext.security.server.SecurityIntegrationFilter.doFilter(SecurityIntegrationFilter.java:70)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:55)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1504)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1504)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1504)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1504)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:376)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.eclipse.aether.deployment.DeploymentException: Failed to deploy artifacts: Could not transfer artifact org.jbpm.contrib:FailedDeployment:jar:7.33.0.Final-redhat-00002 from/to jboss-releases-repository (https://repository.jboss.org/nexus/service/local/staging/deploy/maven2/): Unauthorized (401)
at org.eclipse.aether.internal.impl.DefaultDeployer.deploy(DefaultDeployer.java:318)
at org.eclipse.aether.internal.impl.DefaultDeployer.deploy(DefaultDeployer.java:245)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.deploy(DefaultRepositorySystem.java:420)
at org.guvnor.m2repo.backend.server.repositories.DistributionManagementArtifactRepository.deploy(DistributionManagementArtifactRepository.java:140)
... 91 more
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact org.jbpm.contrib:FailedDeployment:jar:7.33.0.Final-redhat-00002 from/to jboss-releases-repository (https://repository.jboss.org/nexus/service/local/staging/deploy/maven2/): Unauthorized (401)
at org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed(ArtifactTransportListener.java:43)
at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:355)
at org.eclipse.aether.connector.basic.BasicRepositoryConnector.put(BasicRepositoryConnector.java:274)
at org.eclipse.aether.internal.impl.DefaultDeployer.deploy(DefaultDeployer.java:311)
... 94 more
Caused by: org.apache.http.client.HttpResponseException: Unauthorized (401)
at org.eclipse.aether.transport.http.HttpTransporter.handleStatus(HttpTransporter.java:519)
at org.eclipse.aether.transport.http.HttpTransporter.execute(HttpTransporter.java:322)
at org.eclipse.aether.transport.http.HttpTransporter.implPut(HttpTransporter.java:296)
at org.eclipse.aether.spi.connector.transport.AbstractTransporter.put(AbstractTransporter.java:117)
at org.eclipse.aether.connector.basic.BasicRepositoryConnector$PutTaskRunner.runTask(BasicRepositoryConnector.java:510)
at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:350)
... 96 more
~~~

It seems somewhere in the pom hierarchy of this handler there is a distributionManagement section defined with that repository. I have not defined that repository myself, it must be issue with archetype.

[1] https://access.redhat.com/documentation/en-us/red_hat_process_automation_manager/7.5/html-single/custom_tasks_and_work_item_handlers_in_business_central/index#custom-tasks-creating-work-item-handler-projects-proc-custom-tasks