我刚刚将Intellij从2019.2.x版本升级到2019.3，但是在我的Java项目中遇到了以下Maven插件错误。
Cannot resolve plugin org.codehaus.mojo:exec-maven-plugin:1.6.0 Cannot resolve plugin org.apache.maven.plugins:maven-resources-plugin:3.1.0
下面列出了Maven（我刚刚从3.6.0升级到3.6.3）和Java v11的版本。
> Apache Maven 3.6.3 Maven home: /usr/local/Cellar/maven/3.6.3/libexec
> Java version: 11.0.2, vendor: Oracle Corporation, runtime:
/Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home Default
locale: en_GB, platform encoding: UTF-8 OS name: "mac os x", version:
"10.15.1", arch: "x86_64", family: "mac"
下面是从IntelliJ日志文件（idea.log）中摘录的内容
2019-11-29 13:05:06,759 [4279936] INFO - pl.ProjectRootManagerComponent - project roots have changed
2019-11-29 13:05:06,794 [4279971] INFO - .diagnostic.PerformanceWatcher - Pushing properties took 4ms; general responsiveness: ok; EDT responsiveness: ok
2019-11-29 13:05:06,815 [4279992] INFO - .diagnostic.PerformanceWatcher - Indexable file iteration took 20ms; general responsiveness: ok; EDT responsiveness: ok
2019-11-29 13:05:07,480 [4280657] INFO - #org.jetbrains.idea.maven - org.apache.maven.plugin.PluginResolutionException: Plugin org.codehaus.mojo:exec-maven-plugin:1.6.0 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.codehaus.mojo:exec-maven-plugin:jar:1.6.0
java.lang.RuntimeException: org.apache.maven.plugin.PluginResolutionException: Plugin org.codehaus.mojo:exec-maven-plugin:1.6.0 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.codehaus.mojo:exec-maven-plugin:jar:1.6.0
at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:120)
at org.jetbrains.idea.maven.server.Maven3XServerEmbedder.resolvePlugin(Maven3XServerEmbedder.java:1161)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.RuntimeException: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for org.codehaus.mojo:exec-maven-plugin:jar:1.6.0
at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:255)
at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:171)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.readArtifactDescriptor(DefaultRepositorySystem.java:255)
at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:106)
... 18 more
Caused by: java.lang.RuntimeException: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to transfer org.codehaus.mojo:exec-maven-plugin:pom:1.6.0 from https://nexus.xxisp.yyyyyy.net/repository/public/ was cached in the local repository, resolution will not be reattempted until the update interval of nexus has elapsed or updates are forced. Original error: Could not transfer artifact org.codehaus.mojo:exec-maven-plugin:pom:1.6.0 from/to nexus (https://nexus.xxisp.yyyyyy.net/repository/public/): Connect to nexus.xxisp.yyyyyy.net:443 [nexus.xxisp.yyyyyy.net/81.135.143.77] failed: Operation timed out (Connection timed out)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:424)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:229)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:207)
at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:240)
... 21 more
Caused by: java.lang.RuntimeException: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer org.codehaus.mojo:exec-maven-plugin:pom:1.6.0 from https://nexus.xxisp.yyyyyy.net/repository/public/ was cached in the local repository, resolution will not be reattempted until the update interval of nexus has elapsed or updates are forced. Original error: Could not transfer artifact org.codehaus.mojo:exec-maven-plugin:pom:1.6.0 from/to nexus (https://nexus.xxisp.yyyyyy.net/repository/public/): Connect to nexus.xxisp.yyyyyy.net:443 [nexus.xxisp.yyyyyy.net/81.135.143.77] failed: Operation timed out (Connection timed out)
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:225)
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:193)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:559)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:483)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:401)
... 24 more有人知道如何调试它并更好地解决它吗？
这篇文章gist/github帮助我解决了第一个错误，
Cannot resolve plugin org.codehaus.mojo:exec-maven-plugin:1.6.0
我在.m2目录中找到了此插件的条目，
/Users/my-user/.m2/repository/org/codehaus/mojo/exec-maven-plugin/1.6.0
我删除了该条目，并从Intellij内部进行了Maven重新同步。这次似乎没问题。
仍在尝试解决第二个错误，
Cannot resolve plugin org.apache.maven.plugins:maven-resources-plugin:3.1.0