Nexus:maven存储库并行连接限制？

我们的项目集中使用Maven3进行构建，并使用私有NexusVersion2.2存储库从外部托管快照构建和代理工件。它很好用

最近，我尝试使用parallel-T参数来加速我们的maven构建，并且不时观察到一些随机构建失败。失败主要是由于依赖项解析失败造成的，这在非并行模式下很少发生

我的问题是：这可能是由Nexus中的并行连接限制引起的吗？还有其他的可能性吗

谢谢

构建包含20多个模块，通常需要10分钟才能完成。 以下是我昨天晚上的失败：

00:11:11 [ERROR] Failed to execute goal on project app-common: Could not     resolve dependencies for project com.abc.sbo.occ:app-common:jar:1.3.0-SNAPSHOT: Failed to collect dependencies for [com.abc.sbo.occ:common-test:jar:1.3.0-SNAPSHOT (test), com.abc.sbo.occ:bo-frw-common:jar:1.3.0-SNAPSHOT (compile), org.apache.poi:poi:jar:3.9 (compile), org.apache.poi:poi-ooxml:jar:3.9 (compile), net.sf.jxls:jxls-core:jar:1.0.2 (compile), com.aspose.cells:aspose-cells:jar:8.2.1 (compile), junit:junit:jar:4.11 (test), org.mockito:mockito-all:jar:1.9.5 (test), nl.jqno.equalsverifier:equalsverifier:jar:1.1.3 (test), org.codehaus.sonar-plugins.java:sonar-jacoco-listeners:jar:1.2 (test)]: Failed to read artifact descriptor for commons-lang:commons-lang:jar:2.6: Could not find artifact org.apache:apache:pom:7 -> [Help 1]
00:11:11 [ERROR] 
00:11:11 [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
00:11:11 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
00:11:11 [ERROR] 
00:11:11 [ERROR] For more information about the errors and possible solutions, please read the following articles:
00:11:11 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
00:11:11 [ERROR] 
00:11:11 [ERROR] After correcting the problems, you can resume the build with the command
00:11:11 [ERROR]   mvn <goals> -rf :app-common

更新：我切换了-X选项，并在运行一天后捕获了堆栈下的跟踪。声明丢失的工件org.apache:apache:pom:7在Nexus中确实存在很长时间。也许这表明我必须将Nexus升级到最新版本

14:00:47 [ERROR] Failed to execute goal on project app-common: Could not resolve dependencies for project com.abc.sbo.occ:app-common:jar:1.3.0-SNAPSHOT: Failed to collect dependencies for [com.abc.sbo.occ:common-test:jar:1.3.0-SNAPSHOT (test), com.abc.sbo.occ:bo-frw-common:jar:1.3.0-SNAPSHOT (compile), org.apache.poi:poi:jar:3.9 (compile), org.apache.poi:poi-ooxml:jar:3.9 (compile), net.sf.jxls:jxls-core:jar:1.0.2 (compile), com.aspose.cells:aspose-cells:jar:8.2.1 (compile), junit:junit:jar:4.11 (test), org.mockito:mockito-all:jar:1.9.5 (test), nl.jqno.equalsverifier:equalsverifier:jar:1.1.3 (test), org.codehaus.sonar-plugins.java:sonar-jacoco-listeners:jar:1.2 (test)]: Failed to read artifact descriptor for commons-lang:commons-lang:jar:2.6: Could not find artifact org.apache:apache:pom:7 -> [Help 1]
14:00:47 org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project app-common: Could not resolve dependencies for project com.abc.sbo.occ:app-common:jar:1.3.0-SNAPSHOT: Failed to collect dependencies for [com.abc.sbo.occ:common-test:jar:1.3.0-SNAPSHOT (test), com.abc.sbo.occ:bo-frw-common:jar:1.3.0-SNAPSHOT (compile), org.apache.poi:poi:jar:3.9 (compile), org.apache.poi:poi-ooxml:jar:3.9 (compile), net.sf.jxls:jxls-core:jar:1.0.2 (compile), com.aspose.cells:aspose-cells:jar:8.2.1 (compile), junit:junit:jar:4.11 (test), org.mockito:mockito-all:jar:1.9.5 (test), nl.jqno.equalsverifier:equalsverifier:jar:1.1.3 (test), org.codehaus.sonar-plugins.java:sonar-jacoco-listeners:jar:1.2 (test)]
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:210)
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:117)
14:00:47    at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:258)
14:00:47    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:201)
14:00:47    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
14:00:47    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:167)
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleThreadedBuilder$1.call(LifecycleThreadedBuilder.java:163)
14:00:47    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
14:00:47    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
14:00:47    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
14:00:47    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
14:00:47    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
14:00:47    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
14:00:47    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
14:00:47    at java.lang.Thread.run(Thread.java:722)
14:00:47 Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project com.abc.sbo.occ:app-common:jar:1.3.0-SNAPSHOT: Failed to collect dependencies for [com.abc.sbo.occ:common-test:jar:1.3.0-SNAPSHOT (test), com.abc.sbo.occ:bo-frw-common:jar:1.3.0-SNAPSHOT (compile), org.apache.poi:poi:jar:3.9 (compile), org.apache.poi:poi-ooxml:jar:3.9 (compile), net.sf.jxls:jxls-core:jar:1.0.2 (compile), com.aspose.cells:aspose-cells:jar:8.2.1 (compile), junit:junit:jar:4.11 (test), org.mockito:mockito-all:jar:1.9.5 (test), nl.jqno.equalsverifier:equalsverifier:jar:1.1.3 (test), org.codehaus.sonar-plugins.java:sonar-jacoco-listeners:jar:1.2 (test)]
14:00:47    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:158)
14:00:47    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:185)
14:00:47    ... 16 more
14:00:47 Caused by: org.sonatype.aether.collection.DependencyCollectionException: Failed to collect dependencies for [com.abc.sbo.occ:common-test:jar:1.3.0-SNAPSHOT (test), com.abc.sbo.occ:bo-frw-common:jar:1.3.0-SNAPSHOT (compile), org.apache.poi:poi:jar:3.9 (compile), org.apache.poi:poi-ooxml:jar:3.9 (compile), net.sf.jxls:jxls-core:jar:1.0.2 (compile), com.aspose.cells:aspose-cells:jar:8.2.1 (compile), junit:junit:jar:4.11 (test), org.mockito:mockito-all:jar:1.9.5 (test), nl.jqno.equalsverifier:equalsverifier:jar:1.1.3 (test), org.codehaus.sonar-plugins.java:sonar-jacoco-listeners:jar:1.2 (test)]
14:00:47    at org.sonatype.aether.impl.internal.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:258)
14:00:47    at org.sonatype.aether.impl.internal.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:308)
14:00:47    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:150)
14:00:47    ... 17 more
14:00:47 Caused by: org.sonatype.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for commons-lang:commons-lang:jar:2.6
14:00:47    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:331)
14:00:47    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:186)
14:00:47    at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:412)
14:00:47    at org.sonatype.aether.impl.internal.DefaultDependencyCollector.process(DefaultDependencyCollector.java:544)
14:00:47    at org.sonatype.aether.impl.internal.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:240)
14:00:47    ... 19 more
14:00:47 Caused by: org.apache.maven.model.resolution.UnresolvableModelException: Could not find artifact org.apache:apache:pom:7
14:00:47    at org.apache.maven.repository.internal.DefaultModelResolver.resolveModel(DefaultModelResolver.java:126)
14:00:47    at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:813)
14:00:47    at org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:664)
14:00:47    at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:310)
14:00:47    at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:232)
14:00:47    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:322)
14:00:47    ... 23 more
14:00:47 Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could not find artifact org.apache:apache:pom:7
14:00:47    at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:538)
14:00:47    at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216)
14:00:47    at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:193)
14:00:47    at org.apache.maven.repository.internal.DefaultModelResolver.resolveModel(DefaultModelResolver.java:122)
14:00:47    ... 28 more
14:00:47 Caused by: org.sonatype.aether.transfer.ArtifactNotFoundException: Could not find artifact org.apache:apache:pom:7
14:00:47    at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:528)
14:00:47    ... 31 more
14:00:47 [ERROR] 
14:00:47 [ERROR] 
14:00:47 [ERROR] For more information about the errors and possible solutions, please read the following articles:
14:00:47 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
14:00:47 [ERROR] 
14:00:47 [ERROR] After correcting the problems, you can resume the build with the command
14:00:47 [ERROR]   mvn <goals> -rf :app-common

---

没有更多的信息，比如准确的错误消息，一切都是可能的。了解这一点也很有趣：对于从其他存储库下载的工件，您自己的工件会发生这种情况吗？发布或快照？最重要的是，您至少使用Maven 3.1.1或更新版本，而且使用真正最新的Maven插件，因为在几个插件中，特别是与并发执行相关的插件中存在错误。当然，展示亚伦提到的信息。我一直在使用并行构建选项。大型构建280模块请显示您收到的错误消息？顺便问一下：你们有多少模块？构建需要多长时间？谢谢你的回复。我附加了更多信息供您参考。使用-X运行时有什么错误？如果您只能包含错误的一部分，那么使用-X…前20个模块运行并花费10分钟会很慢。有多少测试正在运行？。此外，错误消息提示您可能存在网络问题。访问Maven Central或您的repository manager防火墙/代理？如果有警告，您应该检查整个构建。从干净的构建开始删除本地存储库，并将日志重定向到文件中，然后检查日志文件。