IDEA Unable to import maven project: See logs for details Cannot reconnect.

一、遇到的现象：

　　报错：IDEA Unable to import maven project: See logs for details 

　　（ 直接现象：  IDEA无法将下载的源码转成maven project，以致于项目缺少相应的包，最终导致项目无法运行！）

 

 

二、错误日志：

2020-01-07 13:40:08,540 [1074533]  ERROR -      #org.jetbrains.idea.maven - IntelliJ IDEA 2019.1.3  Build #IU-191.7479.19 
2020-01-07 13:40:08,540 [1074533]  ERROR -      #org.jetbrains.idea.maven - JDK: 1.8.0_202-release; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o 
2020-01-07 13:40:08,540 [1074533]  ERROR -      #org.jetbrains.idea.maven - OS: Windows 10 
2020-01-07 13:40:08,542 [1074535]  ERROR -      #org.jetbrains.idea.maven - Last Action: Maven.DownloadAllSources 
2020-01-07 13:40:08,742 [1074735]   INFO - .diagnostic.PerformanceWatcher - Pushing properties took 110ms; general responsiveness: ok; EDT responsiveness: ok 
2020-01-07 13:40:08,819 [1074812]   INFO - .diagnostic.PerformanceWatcher - Indexable file iteration took 67ms; general responsiveness: ok; EDT responsiveness: ok 
2020-01-07 13:40:25,605 [1091598]   WARN - ConfigurableExtensionPointUtil - ignore deprecated groupId: language for id: preferences.language.Kotlin.scripting 
2020-01-07 13:40:26,080 [1092073]   INFO - j.ide.plugins.RepositoryHelper - using cached plugin list (updated at 2020/1/7 12:25) 
2020-01-07 13:41:11,038 [1137031]   INFO - rationStore.ComponentStoreImpl - Saving Project 'C:\Users\Raodi\Desktop\yinyue\LandCirculationSystem' LandCirculationSystemlibraryTable took 17 ms 
2020-01-07 13:41:11,070 [1137063]   INFO - mponents.impl.stores.StoreUtil - saveProjectsAndApp took 93 ms 
2020-01-07 13:41:12,160 [1138153]   INFO - pl.ProjectRootManagerComponent - project roots have changed 
2020-01-07 13:41:12,259 [1138252]   INFO - indexing.UnindexedFilesUpdater - Unindexed files update canceled 
2020-01-07 13:41:12,261 [1138254]   INFO - pl.ProjectRootManagerComponent - project roots have changed 
2020-01-07 13:41:12,313 [1138306]  ERROR -      #org.jetbrains.idea.maven - Cannot reconnect. 
java.lang.RuntimeException: Cannot reconnect.
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:82)
    at org.jetbrains.idea.maven.server.MavenServerManager.applyProfiles(MavenServerManager.java:404)
    at org.jetbrains.idea.maven.project.MavenProjectReader.applyProfiles(MavenProjectReader.java:399)
    at org.jetbrains.idea.maven.project.MavenProjectReader.doReadProjectModel(MavenProjectReader.java:108)
    at org.jetbrains.idea.maven.project.MavenProjectReader.readProject(MavenProjectReader.java:67)
    at org.jetbrains.idea.maven.project.MavenProject.read(MavenProject.java:665)
    at org.jetbrains.idea.maven.project.MavenProjectsTree.doUpdate(MavenProjectsTree.java:555)
    at org.jetbrains.idea.maven.project.MavenProjectsTree.doAdd(MavenProjectsTree.java:500)
    at org.jetbrains.idea.maven.project.MavenProjectsTree.update(MavenProjectsTree.java:461)
    at org.jetbrains.idea.maven.project.MavenProjectsTree.update(MavenProjectsTree.java:443)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessorReadingTask.perform(MavenProjectsProcessorReadingTask.java:65)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:135)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor.access$000(MavenProjectsProcessor.java:32)
    at org.jetbrains.idea.maven.project.MavenProjectsProcessor$2.run(MavenProjectsProcessor.java:109)
    at org.jetbrains.idea.maven.utils.MavenUtil.lambda$runInBackground$5(MavenUtil.java:458)
    at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:311)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.rmi.RemoteException: Cannot start maven service; nested exception is: 
    com.intellij.execution.ExecutionException
    at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:169)
    at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:74)
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)
    at org.jetbrains.idea.maven.server.MavenServerManager.lambda$applyProfiles$3(MavenServerManager.java:404)
    at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
    ... 20 more
Caused by: com.intellij.execution.ExecutionException
    at com.intellij.execution.rmi.RemoteProcessSupport.acquire(RemoteProcessSupport.java:144)
    at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:166)
    ... 24 more
Caused by: java.lang.AssertionError
    at org.jetbrains.idea.maven.server.MavenServerManager$MavenServerCMDState.createJavaParameters(MavenServerManager.java:731)
    at org.jetbrains.idea.maven.server.MavenServerManager$MavenServerCMDState.startProcess(MavenServerManager.java:793)
    at org.jetbrains.idea.maven.server.MavenServerManager$MavenServerCMDState.execute(MavenServerManager.java:786)
    at com.intellij.execution.rmi.RemoteProcessSupport.startProcess(RemoteProcessSupport.java:197)
    at com.intellij.execution.rmi.RemoteProcessSupport.acquire(RemoteProcessSupport.java:124)
    ... 25 more

 

 

 三、解决方法

　　1、重新下载maven   （此步建议不做，从第2步骤开始）

　　　　在idea中，依次点击“File” -> "Setting .."  -> "Plugins"   ,在Marketplace中搜索插件，“Maven Integration”和“Maven Integration Extension” ，并安装

　　

　　2、配置阿里云镜像库和本地库

　　　　找到内嵌intellij idea的maven包，首先在系统中找到idea的本地程序的安装目录，建议在idea的快捷方式上一路选择 “打开文件位置”

 

　　　　再返回上一级目录，继续进入“\plugins\maven\lib”路径，如下图，这时会看到intellij idea内嵌的maven

 

　　修改“maven3\conf”目录下的settings.xml文件，修改的内容如下：

C:\Users\Raodi\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\191.7479.19\plugins\maven\lib\maven3\lib

 

     
      alimaven
      aliyun maven
      http://maven.aliyun.com/nexus/content/groups/public/
      central        
    

 

　　　　记得的地址内容，建议配置成下图的文件夹，因为有许多的地方会引用该文件夹

 

     完整的文件内容：

"1.0" encoding="UTF-8"?>




"http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  
C:\Users\Raodi\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\191.7479.19\plugins\maven\lib\maven3\lib
  

  

  
  
    
  

  
  
    
  

  
  
    

    
  

  
  
    
       
        
         
      alimaven
      aliyun maven
      http://maven.aliyun.com/nexus/content/groups/public/
      central        
    
  

  
  
    

    
  

  

 

 

 

 

　　3、设置为intellij idea项目默认maven

 　　依次点击“File” ->  "Other Settings"  -> "Settings for New Projects.."  ,在打开的面板中搜索“maven” 

　　选择“maven”后 ，将“Maven home directory:”  的内容设置为intellij idea安装目录中深藏的maven  的家目录即可，最后重新启动intellij idea即可，如下图：