idea下载源代码报错提示Connection refused to host: 127.0.0.1；

今天再点击download Sources时，

控制台报错如下错误：

java.lang.RuntimeException: Cannot reconnect.
   at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:82)
   at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.customizeForResolve(MavenEmbedderWrapper.java:52)
   at org.jetbrains.idea.maven.project.MavenProjectResolver.downloadSourcesAndJavadocs(MavenProjectResolver.java:253)
   at org.jetbrains.idea.maven.project.MavenProjectsProcessorArtifactsDownloadingTask.perform(MavenProjectsProcessorArtifactsDownloadingTask.java:40)
   at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:145)
   at org.jetbrains.idea.maven.project.MavenProjectsProcessor.access$000(MavenProjectsProcessor.java:36)
   at org.jetbrains.idea.maven.project.MavenProjectsProcessor$1.run(MavenProjectsProcessor.java:114)
   at org.jetbrains.idea.maven.utils.MavenUtil.lambda$runInBackground$5(MavenUtil.java:500)
   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$1.call(ApplicationImpl.java:268)
   at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
   at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
   at java.base/java.util.concurrent.ThreadPoolExecutor$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$1.run(Executors.java:665)
   at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
   java.net.ConnectException: Connection refused: connect
   at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:623)
   at java.rmi/sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:209)
   at java.rmi/sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:196)
   at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:132)
   at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:217)
   at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:162)
   at com.sun.proxy.$Proxy148.createEmbedder(Unknown Source)
   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 com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:155)
   at com.intellij.execution.rmi.RemoteUtil.access$400(RemoteUtil.java:25)
   at com.intellij.execution.rmi.RemoteUtil$1.lambda$invoke$0(RemoteUtil.java:139)
   at com.intellij.openapi.util.ClassLoaderUtil.computeWithClassLoader(ClassLoaderUtil.java:31)
   at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:207)
   at com.intellij.execution.rmi.RemoteUtil$1.invoke(RemoteUtil.java:139)
   at com.sun.proxy.$Proxy148.createEmbedder(Unknown Source)
   at org.jetbrains.idea.maven.server.MavenServerConnector.createEmbedder(MavenServerConnector.java:187)
   at org.jetbrains.idea.maven.server.MavenServerManager$2.create(MavenServerManager.java:397)
   at org.jetbrains.idea.maven.server.MavenServerManager$2.create(MavenServerManager.java:385)
   at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)
   at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.doCustomize(MavenEmbedderWrapper.java:93)
   at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.lambda$customizeForResolve$0(MavenEmbedderWrapper.java:53)
   at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
   ... 18 more
Caused by: java.net.ConnectException: Connection refused: connect
   at java.base/java.net.PlainSocketImpl.connect0(Native Method)
   at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101)
   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:403)
   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:121)
   at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:617)
   ... 42 more

解决方案：设置正确jdk就行。

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idea下载源代码报错提示Connection refused to host: 127.0.0.1；

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