I tried to import jboss-sandbox-quickstarts (from https://github.com/jboss-developer/jboss-sandbox-quickstarts.git) and I found following issues with it

• it takes quite a long time (app 3 and a half minutes to import 9 projects
• during import it seems to be "stuck" for a while and the following exception is logged

  org.eclipse.core.runtime.CoreException: Could not calculate build plan: Plugin org.apache.maven.plugins:maven-ejb-plugin:2.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-ejb-plugin:jar:2.3
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl.setupMojoExecution(MavenImpl.java:410)
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl$2.call(MavenImpl.java:420)
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl$2.call(MavenImpl.java:1)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl.setupMojoExecution(MavenImpl.java:418)
  	at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.setupMojoExecution(ProjectRegistryManager.java:950)
  	at org.eclipse.m2e.core.internal.project.registry.MavenProjectFacade.getMojoExecution(MavenProjectFacade.java:408)
  	at org.eclipse.m2e.core.project.configurator.AbstractCustomizableLifecycleMapping.getBuildParticipants(AbstractCustomizableLifecycleMapping.java:76)
  	at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:97)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:501)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:1)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:494)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.configureNewMavenProjects(ProjectConfigurationManager.java:281)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$4.run(ProjectConfigurationManager.java:521)
  	at org.eclipse.m2e.core.internal.embedder.AbstractRunnable.call(AbstractRunnable.java:26)
  	at org.eclipse.m2e.core.internal.embedder.AbstractRunnable.call(AbstractRunnable.java:1)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
  	at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1355)
  	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.enableMavenNature(ProjectConfigurationManager.java:518)
  	at org.jboss.tools.playground.easymport.maven.MavenProjectConfigurator.configure(MavenProjectConfigurator.java:44)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.importProjectAndChildrenRecursively(EasymportJob.java:236)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.access$0(EasymportJob.java:198)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob$CrawlFolderJob.run(EasymportJob.java:154)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.searchAndImportChildrenProjectsRecursively(EasymportJob.java:185)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.importProjectAndChildrenRecursively(EasymportJob.java:245)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.access$0(EasymportJob.java:198)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob$CrawlFolderJob.run(EasymportJob.java:154)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.searchAndImportChildrenProjectsRecursively(EasymportJob.java:185)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.importProjectAndChildrenRecursively(EasymportJob.java:245)
  	at org.eclipse.ui.internal.wizards.datatransfer.EasymportJob.run(EasymportJob.java:93)
  	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
  Caused by: org.apache.maven.plugin.PluginResolutionException: Plugin org.apache.maven.plugins:maven-ejb-plugin:2.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-ejb-plugin:jar:2.3
  	at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:117)
  	at org.eclipse.m2e.core.internal.project.registry.EclipsePluginDependenciesResolver.resolve(EclipsePluginDependenciesResolver.java:47)
  	at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor(DefaultMavenPluginManager.java:179)
  	at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getMojoDescriptor(DefaultMavenPluginManager.java:298)
  	at org.apache.maven.plugin.DefaultBuildPluginManager.getMojoDescriptor(DefaultBuildPluginManager.java:241)
  	at org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecution(DefaultLifecycleExecutionPlanCalculator.java:169)
  	at org.eclipse.m2e.core.internal.embedder.MavenImpl.setupMojoExecution(MavenImpl.java:408)
  	... 35 more
  Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven.plugins:maven-ejb-plugin:jar:2.3
  	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:302)
  	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:218)
  	at org.eclipse.aether.internal.impl.DefaultRepositorySystem.readArtifactDescriptor(DefaultRepositorySystem.java:287)
  	at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:103)
  	... 41 more
  Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to transfer org.apache.maven.plugins:maven-ejb-plugin:pom:2.3 from file:/home/ljelinko/programs/server/maven-repo/eap-6.4/jboss-eap-6.4.0.GA-maven-repository/ was cached in the local repository, resolution will not be reattempted until the update interval of jboss-eap-maven-repository has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-ejb-plugin:pom:2.3 from/to jboss-eap-maven-repository (file:/home/ljelinko/programs/server/maven-repo/eap-6.4/jboss-eap-6.4.0.GA-maven-repository/): The operation was cancelled.
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
  	at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:287)
  	... 44 more
  Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer org.apache.maven.plugins:maven-ejb-plugin:pom:2.3 from file:/home/ljelinko/programs/server/maven-repo/eap-6.4/jboss-eap-6.4.0.GA-maven-repository/ was cached in the local repository, resolution will not be reattempted until the update interval of jboss-eap-maven-repository has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-ejb-plugin:pom:2.3 from/to jboss-eap-maven-repository (file:/home/ljelinko/programs/server/maven-repo/eap-6.4/jboss-eap-6.4.0.GA-maven-repository/): The operation was cancelled.
  	at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:238)
  	at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:206)
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:585)
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:503)
  	at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:421)
  	... 47 more