背景
雖然標題貌似跟證書PKIX有關，實則沒有半毛錢關係。昨晚上整理電腦的文件夾，將項目文件夾移動了位置，今天上午開完公司站會就開始車禍現場，一直到下午一點才解決。┭┮﹏┭┮
問題
idea 導入maven項目報錯，錯誤信息如下：
2020-03-10 12:42:14,606 [ 138105] INFO - #org.jetbrains.idea.maven - [WARNING] Failure to transfer XXX-api-dependencies:0.0.1-SNAPSHOT/maven-metadata.xml from https://nexus.XXX.cn/repository/maven-public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-releases has elapsed or updates are forced. Original error: Could not transfer metadata XXX-api-dependencies:0.0.1-SNAPSHOT/maven-metadata.xml from/to nexus-releases (https://nexus.XXX.cn/repository/maven-public): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
2020-03-10 12:42:14,656 [ 138155] INFO - #org.jetbrains.idea.maven - org.apache.maven.model.resolution.UnresolvableModelException: Failure to transfer XXX-api-dependencies:pom:0.0.1-SNAPSHOT from https://nexus.XXX.cn/repository/maven-public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-releases has elapsed or updates are forced. Original error: Could not transfer artifact XXX-api-dependencies:pom:0.0.1-SNAPSHOT from/to nexus-releases (https://nexus.XXX.cn/repository/maven-public): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
java.lang.RuntimeException: org.apache.maven.model.resolution.UnresolvableModelException: Failure to transfer XXX-api-dependencies:pom:0.0.1-SNAPSHOT from https://nexus.XXX.cn/repository/maven-public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-releases has elapsed or updates are forced. Original error: Could not transfer artifact XXX-api-dependencies:pom:0.0.1-SNAPSHOT from/to nexus-releases (https://nexus.XXX.cn/repository/maven-public): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:196)
at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:242)
at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:1062)
at org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:838)
at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:332)
at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:171)
at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:122)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.buildSinglePom(Maven3ServerEmbedder.java:195)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.getProjectBuildingResults(Maven3ServerEmbedder.java:166)
at org.jetbrains.idea.maven.server.Maven3XServerEmbedder$3.run(Maven3XServerEmbedder.java:683)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder$2.run(Maven3ServerEmbedder.java:347)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.executeWithSessionScope(Maven3ServerEmbedder.java:422)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.executeWithMavenSession(Maven3ServerEmbedder.java:355)
at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.executeWithMavenSession(Maven3ServerEmbedder.java:344)
at org.jetbrains.idea.maven.server.Maven3XServerEmbedder.doResolveProject(Maven3XServerEmbedder.java:664)
at org.jetbrains.idea.maven.server.Maven3XServerEmbedder.resolveProject(Maven3XServerEmbedder.java:626)
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.ArtifactResolutionException: Failure to transfer XXX-api-dependencies:pom:0.0.1-SNAPSHOT from https://nexus.XXX.cn/repository/maven-public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-releases has elapsed or updates are forced. Original error: Could not transfer artifact XXX-api-dependencies:pom:0.0.1-SNAPSHOT from/to nexus-releases (https://nexus.XXX.cn/repository/maven-public): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:423)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:225)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:202)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:257)
at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:192)
... 32 more
Caused by: java.lang.RuntimeException: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer XXX-api-dependencies:pom:0.0.1-SNAPSHOT from https://nexus.XXX.cn/repository/maven-public was cached in the local repository, resolution will not be reattempted until the update interval of nexus-releases has elapsed or updates are forced. Original error: Could not transfer artifact XXX-api-dependencies:pom:0.0.1-SNAPSHOT from/to nexus-releases (https://nexus.XXX.cn/repository/maven-public): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:226)
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:192)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:564)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:482)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:400)
... 36 more
解決
原因：idea中緩存maven倉庫信息，由於項目文件地址改變，但是maven倉庫信息並沒有隨之替換掉。
步驟：
- 找到本地項目maven repository倉庫，刪除
- 重啓ideal，setting->Invalidate Caches/ Restart…
- maven重新import，搞定
反思
出現今天這次“車禍”主要是由於沒有認真查看idea log，碰到問題，首先要認真查看日誌，通過日誌可以讓自己準確定位錯誤問題。給大家一個“血”的經驗~
參考：idea導入maven項目出現報錯 感謝博主的問題以及網友的熱心解答，Thanks♪(･ω･)ﾉ