KIE Drools Workbench无法解决Maven依赖关系

Question

我有一个在Tomcat 7服务器上运行的Kie drools工作台6.4.0.Final实例。 我无法通过工作台UI向我的项目添加依赖项。 例如，如果我尝试像用户指南中那样包含Drools游泳池模型 ，则应用程序无法加载存储库软件包。

查看我的Catalina日志，我看到以下警告：

  Nov 25, 2016 2:34:11 PM org.kie.scanner.MavenRepository resolveArtifact
WARNING: Unable to resolve artifact: org.chtijbug.drools:drools-framework-swimming-pool-model:2.0.3

我还注意到一些与此类似的错误：

SEVERE: Unable to create MavenProject from InputStream
org.kie.scanner.embedder.MavenEmbedderException: Failed to read artifact descriptor for junit:junit:jar:4.12
    at org.kie.scanner.embedder.MavenEmbedder.readProject(MavenEmbedder.java:298)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:62)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:55)
    at org.kie.scanner.MavenPomModelGenerator.parse(MavenPomModelGenerator.java:33)
    at org.drools.compiler.kproject.xml.PomModel$Parser.parse(PomModel.java:110)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getPomModel(AbstractKieModule.java:436)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getJarDependencies(AbstractKieModule.java:130)
    at org.kie.scanner.MavenClassLoaderResolver.getClassLoader(MavenClassLoaderResolver.java:65)
    at org.drools.compiler.kie.builder.impl.KieModuleKieProject.<init>(KieModuleKieProject.java:68)
    at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieContainer(KieServicesImpl.java:188)
    at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieContainer(KieServicesImpl.java:172)
    at org.jbpm.kie.services.impl.KModuleDeploymentService.deploy(KModuleDeploymentService.java:136)
    at org.jbpm.services.cdi.impl.DeploymentServiceCDIImpl$Proxy$_$$_WeldClientProxy.deploy(DeploymentServiceCDIImpl$Proxy$_$$_WeldClientProxy.java)
    at org.jbpm.console.ng.bd.backend.server.DeploymentManagerEntryPointImpl.initDeployments(DeploymentManagerEntryPointImpl.java:128)
    at org.jbpm.console.ng.bd.backend.server.DeploymentManagerEntryPointImpl$Proxy$_$$_WeldClientProxy.initDeployments(DeploymentManagerEntryPointImpl$Proxy$_$$_WeldClientProxy.java)
    at org.jbpm.console.ng.bd.backend.server.AdministrationServiceImpl.bootstrapDeployments(AdministrationServiceImpl.java:194)
    at org.jbpm.console.ng.bd.backend.server.AdministrationServiceImpl$Proxy$_$$_WeldClientProxy.bootstrapDeployments(AdministrationServiceImpl$Proxy$_$$_WeldClientProxy.java)
    at org.kie.workbench.drools.backend.server.AppSetup.assertPlayground(AppSetup.java:190)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:273)
    at org.jboss.weld.introspector.jlr.WeldMethodImpl.invoke(WeldMethodImpl.java:168)
    at org.jboss.weld.bean.AbstractClassBean.defaultPostConstruct(AbstractClassBean.java:363)
    at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget.postConstruct(ManagedBean.java:178)
    at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:298)
    at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:104)
    at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:90)
    at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:79)
    at org.kie.workbench.drools.backend.server.AppSetup$Proxy$_$$_WeldClientProxy.toString(AppSetup$Proxy$_$$_WeldClientProxy.java)
    at org.uberfire.backend.server.cdi.SystemConfigProducer.runPostConstruct(SystemConfigProducer.java:162)
    at org.uberfire.backend.server.cdi.SystemConfigProducer.afterDeploymentValidation(SystemConfigProducer.java:143)
    at org.uberfire.backend.server.cdi.SystemConfigProducer$Proxy$_$$_WeldClientProxy.afterDeploymentValidation(SystemConfigProducer$Proxy$_$$_WeldClientProxy.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:273)
    at org.jboss.weld.introspector.jlr.WeldMethodImpl.invokeOnInstance(WeldMethodImpl.java:164)
    at org.jboss.weld.introspector.ForwardingWeldMethod.invokeOnInstance(ForwardingWeldMethod.java:51)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:163)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:245)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:233)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:213)
    at org.jboss.weld.bootstrap.events.AbstractContainerEvent.fire(AbstractContainerEvent.java:75)
    at org.jboss.weld.bootstrap.events.AbstractDeploymentContainerEvent.fire(AbstractDeploymentContainerEvent.java:46)
    at org.jboss.weld.bootstrap.events.AfterDeploymentValidationImpl.fire(AfterDeploymentValidationImpl.java:31)
    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:382)
    at org.jboss.weld.environment.servlet.Listener.contextInitialized(Listener.java:182)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5118)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5634)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1092)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1984)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for junit:junit:jar:4.12
    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:302)
    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:217)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.resolveCachedArtifactDescriptor(DefaultDependencyCollector.java:525)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.getArtifactDescriptorResult(DefaultDependencyCollector.java:509)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:409)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:363)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process(DefaultDependencyCollector.java:351)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:254)
    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:316)
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:172)
    at org.apache.maven.project.DefaultProjectBuilder.resolveDependencies(DefaultProjectBuilder.java:213)
    at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:186)
    at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:124)
    at org.kie.scanner.embedder.MavenEmbedder.readProject(MavenEmbedder.java:293)
    ... 68 more

Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact junit:junit:pom:4.12 from/to central (https://repo.maven.apache.org/maven2): connect timed out
    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)
    ... 81 more
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact junit:junit:pom:4.12 from/to central (https://repo.maven.apache.org/maven2): connect timed out
    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.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:67)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$DirectExecutor.execute(BasicRepositoryConnector.java:581)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector.get(BasicRepositoryConnector.java:249)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:520)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:421)
    ... 84 more
Caused by: java.net.SocketTimeoutException: connect timed out
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
    at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:524)
    at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:403)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
    at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
    at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
    at org.apache.http.impl.client.DecompressingHttpClient.execute(DecompressingHttpClient.java:158)
    at org.eclipse.aether.transport.http.HttpTransporter.execute(HttpTransporter.java:279)
    at org.eclipse.aether.transport.http.HttpTransporter.implGet(HttpTransporter.java:235)
    at org.eclipse.aether.spi.connector.transport.AbstractTransporter.get(AbstractTransporter.java:59)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:447)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:350)
    ... 89 more

Nov 25, 2016 8:25:55 AM org.kie.scanner.embedder.MavenProjectLoader parseMavenPom
SEVERE: Unable to create MavenProject from InputStream
org.kie.scanner.embedder.MavenEmbedderException: Failed to read artifact descriptor for junit:junit:jar:4.12
    at org.kie.scanner.embedder.MavenEmbedder.readProject(MavenEmbedder.java:298)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:62)
    at org.kie.scanner.embedder.MavenProjectLoader.parseMavenPom(MavenProjectLoader.java:55)
    at org.kie.scanner.MavenPomModelGenerator.parse(MavenPomModelGenerator.java:33)
    at org.drools.compiler.kproject.xml.PomModel$Parser.parse(PomModel.java:110)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getPomModel(AbstractKieModule.java:436)
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getJarDependencies(AbstractKieModule.java:130)
    at org.jbpm.kie.services.impl.KModuleDeploymentService.deploy(KModuleDeploymentService.java:179)
    at org.jbpm.services.cdi.impl.DeploymentServiceCDIImpl$Proxy$_$$_WeldClientProxy.deploy(DeploymentServiceCDIImpl$Proxy$_$$_WeldClientProxy.java)
    at org.jbpm.console.ng.bd.backend.server.DeploymentManagerEntryPointImpl.initDeployments(DeploymentManagerEntryPointImpl.java:128)
    at org.jbpm.console.ng.bd.backend.server.DeploymentManagerEntryPointImpl$Proxy$_$$_WeldClientProxy.initDeployments(DeploymentManagerEntryPointImpl$Proxy$_$$_WeldClientProxy.java)
    at org.jbpm.console.ng.bd.backend.server.AdministrationServiceImpl.bootstrapDeployments(AdministrationServiceImpl.java:194)
    at org.jbpm.console.ng.bd.backend.server.AdministrationServiceImpl$Proxy$_$$_WeldClientProxy.bootstrapDeployments(AdministrationServiceImpl$Proxy$_$$_WeldClientProxy.java)
    at org.kie.workbench.drools.backend.server.AppSetup.assertPlayground(AppSetup.java:190)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:273)
    at org.jboss.weld.introspector.jlr.WeldMethodImpl.invoke(WeldMethodImpl.java:168)
    at org.jboss.weld.bean.AbstractClassBean.defaultPostConstruct(AbstractClassBean.java:363)
    at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget.postConstruct(ManagedBean.java:178)
    at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:298)
    at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:104)
    at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:90)
    at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:79)
    at org.kie.workbench.drools.backend.server.AppSetup$Proxy$_$$_WeldClientProxy.toString(AppSetup$Proxy$_$$_WeldClientProxy.java)
    at org.uberfire.backend.server.cdi.SystemConfigProducer.runPostConstruct(SystemConfigProducer.java:162)
    at org.uberfire.backend.server.cdi.SystemConfigProducer.afterDeploymentValidation(SystemConfigProducer.java:143)
    at org.uberfire.backend.server.cdi.SystemConfigProducer$Proxy$_$$_WeldClientProxy.afterDeploymentValidation(SystemConfigProducer$Proxy$_$$_WeldClientProxy.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:273)
    at org.jboss.weld.introspector.jlr.WeldMethodImpl.invokeOnInstance(WeldMethodImpl.java:164)
    at org.jboss.weld.introspector.ForwardingWeldMethod.invokeOnInstance(ForwardingWeldMethod.java:51)
    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:163)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:245)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:233)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:213)
    at org.jboss.weld.bootstrap.events.AbstractContainerEvent.fire(AbstractContainerEvent.java:75)
    at org.jboss.weld.bootstrap.events.AbstractDeploymentContainerEvent.fire(AbstractDeploymentContainerEvent.java:46)
    at org.jboss.weld.bootstrap.events.AfterDeploymentValidationImpl.fire(AfterDeploymentValidationImpl.java:31)
    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:382)
    at org.jboss.weld.environment.servlet.Listener.contextInitialized(Listener.java:182)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5118)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5634)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1092)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1984)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for junit:junit:jar:4.12
    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:302)
    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:217)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.resolveCachedArtifactDescriptor(DefaultDependencyCollector.java:525)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.getArtifactDescriptorResult(DefaultDependencyCollector.java:509)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:409)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency(DefaultDependencyCollector.java:363)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process(DefaultDependencyCollector.java:351)
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.collectDependencies(DefaultDependencyCollector.java:254)
    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies(DefaultRepositorySystem.java:316)
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:172)
    at org.apache.maven.project.DefaultProjectBuilder.resolveDependencies(DefaultProjectBuilder.java:213)
    at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:186)
    at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:124)
    at org.kie.scanner.embedder.MavenEmbedder.readProject(MavenEmbedder.java:293)
    ... 64 more
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to transfer junit:junit:pom:4.12 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact junit:junit:pom:4.12 from/to central (https://repo.maven.apache.org/maven2): connect timed out
    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)
    ... 77 more
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer junit:junit:pom:4.12 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact junit:junit:pom:4.12 from/to central (https://repo.maven.apache.org/maven2): connect timed out
    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)
    ... 80 more

当我添加依赖项时，Maven能够解析本地项目中的游泳池模型：

<dependency>
    <groupId>org.chtijbug.drools</groupId>
    <artifactId>drools-framework-swimming-pool-model</artifactId>
    <version>2.0.3</version>
</dependency>

到其pom.xml

我在Tomcat的Java选项中使用以下命令设置了代理：

-Dhttp.proxyHost=proxy_server
-Dhttp.proxyPort=8080

我是否可能缺少任何Drools或Maven配置，这些配置会阻止Maven解决依赖关系？

新的信息

经过一些试验，我意识到当不使用代理服务器时，工作台能够解决依赖关系。 似乎类似于这里遇到的问题。 我的代理服务器已经在我的settings.xml中设置：

 <proxies>
    <proxy>
      <active>true</active>
      <protocol>http</protocol>
      <host>proxy_server</host>
      <port>8080</port>
      <nonProxyHosts>127.0.0.1</nonProxyHosts>
   </proxy>

这些设置对我的Java项目来说很好用。 如上所述，我在Tomcat中为代理服务器设置了Java选项。 也许还有其他工作台或Tomcat配置可以使Workbench解析我的代理背后的依赖关系吗？

Answer 1

我是否可能缺少任何Drools或Maven配置，这些配置会阻止Maven解决依赖关系？

一些说明，以防其中任何一种帮助您：

1. 列出所需的依赖项是正常的Maven配置。 这就是使这项工作起作用的原因，您发现了：

   当我添加依赖项时，Maven能够解析本地项目中的游泳池模型：

   因此，将KWB项目所需的每个外部依赖项添加到KWB项目的pom.xml中。

2. 找不到工件后，Maven会超时，然后再次检查。 您运行中的此日志消息指出：

   来自https://repo.maven.apache.org/maven2的内容已缓存在本地存储库中，直到中心的更新间隔过去或强制执行更新后，才会重新尝试解析。

   您可以手动使缓存过期，但这取决于您的其他工具。 例如，如果只有Maven并且从命令行运行，则使用“ -U”选项； 但是，KWB使用嵌入式Maven，因此手动删除本地工件中相应工件的maven-metadata- *文件可能是最简单的。 如果使用工件管理器（例如Nexus），请使用其UI选项使代理存储库的缓存过期。

3. 由于不确定您的配置，因此不确定Tomcat代理设置是否有帮助。 但是，我会在没有它们的情况下进行测试，以确保它们不会干扰。

4. 您是否正在运行工件管理器（例如Nexus）？ 如果是这样，则相应地配置.m2 / settings.xml以使Maven使用它。