IDEA 的maven出错Unable to import maven project

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刚使用Idea，照着网上配置maven，报错：Unable to import maven project: See logs for details，根据提示看日志

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:526)
	at org.jetbrains.idea.maven.project.MavenProjectReader.applyProfiles(MavenProjectReader.java:394)
	at org.jetbrains.idea.maven.project.MavenProjectReader.doReadProjectModel(MavenProjectReader.java:103)
	at org.jetbrains.idea.maven.project.MavenProjectReader.readProject(MavenProjectReader.java:62)
	at org.jetbrains.idea.maven.project.MavenProject.read(MavenProject.java:643)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.doUpdate(MavenProjectsTree.java:554)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.update(MavenProjectsTree.java:463)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.updateAll(MavenProjectsTree.java:431)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessorReadingTask.perform(MavenProjectsProcessorReadingTask.java:60)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:132)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor.access$000(MavenProjectsProcessor.java:32)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor$2.run(MavenProjectsProcessor.java:107)
	at org.jetbrains.idea.maven.utils.MavenUtil.lambda$runInBackground$5(MavenUtil.java:446)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:305)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.rmi.RemoteException: Cannot start maven service; nested exception is: 
	com.intellij.execution.ExecutionException: 
	at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:161)
	at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:66)
	at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)
	at org.jetbrains.idea.maven.server.MavenServerManager.lambda$applyProfiles$3(MavenServerManager.java:526)
	at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
	... 19 more
Caused by: com.intellij.execution.ExecutionException: 
	at com.intellij.execution.rmi.RemoteProcessSupport.acquire(RemoteProcessSupport.java:160)
	at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:158)
	... 23 more
Caused by: java.lang.AssertionError
	at org.jetbrains.idea.maven.server.MavenServerManager$2.createJavaParameters(MavenServerManager.java:308)
	at org.jetbrains.idea.maven.server.MavenServerManager$2.startProcess(MavenServerManager.java:365)
	at org.jetbrains.idea.maven.server.MavenServerManager$2.execute(MavenServerManager.java:358)
	at com.intellij.execution.rmi.RemoteProcessSupport.startProcess(RemoteProcessSupport.java:210)
	at com.intellij.execution.rmi.RemoteProcessSupport.acquire(RemoteProcessSupport.java:139)
	... 24 more
2018-08-17 11:24:55,139 [  56995]  ERROR -      #org.jetbrains.idea.maven - IntelliJ IDEA 2018.1.3  Build #IU-181.4892.42 
2018-08-17 11:24:55,139 [  56995]  ERROR -      #org.jetbrains.idea.maven - JDK: 1.8.0_152-release 
2018-08-17 11:24:55,140 [  56996]  ERROR -      #org.jetbrains.idea.maven - VM: OpenJDK 64-Bit Server VM 
2018-08-17 11:24:55,141 [  56997]  ERROR -      #org.jetbrains.idea.maven - Vendor: JetBrains s.r.o 
2018-08-17 11:24:55,141 [  56997]  ERROR -      #org.jetbrains.idea.maven - OS: Windows 10 
2018-08-17 11:24:55,141 [  56997]  ERROR -      #org.jetbrains.idea.maven - Last Action:  
2018-08-17 11:24:56,062 [  57918]   WARN -      #org.jetbrains.idea.maven - Cannot reconnect.

其他人说的改jdk，以及localhost 出问题的都不是我这个的问题，遂检查maven环境，发现mvn -v 报错：找不到或无法加载主类 org.codehaus.plexus.classworlds.launcher.Launcher；

于是尝试着换一个maven，重新下了一个maven，配上环境，没有问题，idea配置maven，问题解决，我自己的maven有问题，我之前的maven包是别人给的，一开始就配不了环境变量，但是eclipse使用的时候并不会有问题，就一直没换，可能是idea环境变量不行maven就用不了。