最近更新idea到2021.1版本，我的电脑是MacBookPro M1的版本。
然后经常遇到这种情况，
点击maven的reload按钮，会抛出以下异常：

java.lang.RuntimeException: Cannot reconnect.
	at org.jetbrains.idea.maven.server.MavenServerConnectorImpl.perform(MavenServerConnectorImpl.java:177)
	at org.jetbrains.idea.maven.server.MavenServerConnector.applyProfiles(MavenServerConnector.java:79)
	at org.jetbrains.idea.maven.project.MavenProjectReader.applyProfiles(MavenProjectReader.java:419)
	at org.jetbrains.idea.maven.project.MavenProjectReader.doReadProjectModel(MavenProjectReader.java:99)
	at org.jetbrains.idea.maven.project.MavenProjectReader$1.doProcessParent(MavenProjectReader.java:474)
	at org.jetbrains.idea.maven.project.MavenProjectReader$1.doProcessParent(MavenProjectReader.java:450)
	at org.jetbrains.idea.maven.project.MavenParentProjectFileProcessor.processRepositoryParent(MavenParentProjectFileProcessor.java:84)
	at org.jetbrains.idea.maven.project.MavenParentProjectFileProcessor.process(MavenParentProjectFileProcessor.java:62)
	at org.jetbrains.idea.maven.project.MavenProjectReader.resolveInheritance(MavenProjectReader.java:477)
	at org.jetbrains.idea.maven.project.MavenProjectReader.doReadProjectModel(MavenProjectReader.java:96)
	at org.jetbrains.idea.maven.project.MavenProjectReader.readProject(MavenProjectReader.java:57)
	at org.jetbrains.idea.maven.project.MavenProject.read(MavenProject.java:682)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.doUpdate(MavenProjectsTree.java:549)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.update(MavenProjectsTree.java:459)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.update(MavenProjectsTree.java:438)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessorReadingTask.perform(MavenProjectsProcessorReadingTask.java:65)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:146)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor$1.run(MavenProjectsProcessor.java:115)
	at org.jetbrains.idea.maven.utils.MavenUtil.lambda$runInBackground$6(MavenUtil.java:530)
	at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20)
	at com.intellij.util.RunnableCallable.call(RunnableCallable.java:11)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.call(ApplicationImpl.java:265)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
	java.net.ConnectException: Connection refused (Connection refused)
	at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:623)
	at java.rmi/sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:209)
	at java.rmi/sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:196)
	at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:132)
	at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:217)
	at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:162)
	at com.sun.proxy.$Proxy163.applyProfiles(Unknown Source)
	at jdk.internal.reflect.GeneratedMethodAccessor283.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:150)
	at com.intellij.execution.rmi.RemoteUtil.access$400(RemoteUtil.java:21)
	at com.intellij.execution.rmi.RemoteUtil$1.lambda$invoke$0(RemoteUtil.java:134)
	at com.intellij.openapi.util.ClassLoaderUtil.computeWithClassLoader(ClassLoaderUtil.java:31)
	at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:202)
	at com.intellij.execution.rmi.RemoteUtil$1.invoke(RemoteUtil.java:134)
	at com.sun.proxy.$Proxy163.applyProfiles(Unknown Source)
	at org.jetbrains.idea.maven.server.MavenServerConnector.lambda$applyProfiles$3(MavenServerConnector.java:80)
	at org.jetbrains.idea.maven.server.MavenServerConnectorImpl.perform(MavenServerConnectorImpl.java:169)
	... 29 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at java.base/java.net.Socket.connect(Socket.java:558)
	at java.base/java.net.Socket.<init>(Socket.java:454)
	at java.base/java.net.Socket.<init>(Socket.java:231)
	at com.intellij.execution.rmi.RemoteServer$1.createSocket(RemoteServer.java:174)
	at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:617)
	... 47 more

java.lang.RuntimeException: Cannot reconnect.
然后一开始，我只能关掉idea再打开，再reload才不会报错。

后来发现解决的方案。

将JDK for importer改为自己安装的jdk即可，瞬间起飞。