Maven下载源码报错(MAC)–Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1；
记录一下debug源码时遇到的Maven异常问题，供自己以后检索。
详细报错信息
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:38)
at org.jetbrains.idea.maven.project.MavenProjectResolver.downloadSourcesAndJavadocs(MavenProjectResolver.java:256)
at org.jetbrains.idea.maven.project.MavenProjectsProcessorArtifactsDownloadingTask.perform(MavenProjectsProcessorArtifactsDownloadingTask.java:40)
at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:146)
at org.jetbrains.idea.maven.project.MavenProjectsProcessor
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1.run(MavenProjectsProcessor.java:115) at org.jetbrains.idea.maven.utils.MavenUtil.lambda
1.run(MavenProjectsProcessor.java:115)atorg.jetbrains.idea.maven.utils.MavenUtil.lambdarunInBackground$5(MavenUtil.java:524)
at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20)
at com.intellij.util.RunnableCallable.call(RunnableCallable.java:11)
at com.intellij.openapi.application.impl.ApplicationImpl
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1.call(ApplicationImpl.java:270) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor
1.call(ApplicationImpl.java:270)atjava.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)atjava.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)atjava.base/java.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:628)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1
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1.run(Executors.java:668) at java.base/java.util.concurrent.Executors
1.run(Executors.java:668)atjava.base/java.util.concurrent.ExecutorsPrivilegedThreadFactory$1
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1.run(Executors.java:665) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.util.concurrent.Executors
1.run(Executors.java:665)atjava.base/java.security.AccessController.doPrivileged(NativeMethod)atjava.base/java.util.concurrent.ExecutorsPrivilegedThreadFactory
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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.
1.run(Executors.java:665)atjava.base/java.lang.Thread.run(Thread.java:834)Causedby:java.rmi.ConnectException:Connectionrefusedtohost:127.0.0.1;nestedexceptionis:java.net.ConnectException:Connectionrefused(Connectionrefused)atjava.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:623)atjava.rmi/sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:209)atjava.rmi/sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:196)atjava.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:132)atjava.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:217)atjava.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:162)atcom.sun.proxy.Proxy157.createEmbedder(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor3835.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
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1.lambda
1.lambdainvoke$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
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1.invoke(RemoteUtil.java:134) at com.sun.proxy.
1.invoke(RemoteUtil.java:134)atcom.sun.proxy.Proxy157.createEmbedder(Unknown Source)
at org.jetbrains.idea.maven.server.MavenServerConnectorImpl.createEmbedder(MavenServerConnectorImpl.java:192)
at org.jetbrains.idea.maven.server.MavenServerManager$3.create(MavenServerManager.java:371)
at org.jetbrains.idea.maven.server.MavenServerManager
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3.create(MavenServerManager.java:359) at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41) at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.doCustomize(MavenEmbedderWrapper.java:79) at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.lambda
3.create(MavenServerManager.java:359)atorg.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)atorg.jetbrains.idea.maven.server.MavenEmbedderWrapper.doCustomize(MavenEmbedderWrapper.java:79)atorg.jetbrains.idea.maven.server.MavenEmbedderWrapper.lambdacustomizeForResolve$0(MavenEmbedderWrapper.java:39)
at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
… 17 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.(Socket.java:454)
at java.base/java.net.Socket.(Socket.java:231)
at com.intellij.execution.rmi.RemoteServer$1.createSocket(RemoteServer.java:122)
at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:617)
… 40 more
解决方案
IntelliJ IDEA --> Preferences --> Build，Execution，Deployment --> Build Tools --> Maven --> Importing -->JDK for importer选择我们已经安装的JDK版本
在这里插入图片描述
如果还是解决不了问题，可以尝试添加如下两个参数：
1）maven -> Importing -> VM options for importer
-Xmx768m -Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true -Djava.net.preferIPv4Stack=true
2）maven -> Runner -> VM Options
-Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true -Dmaven.wagon.http.ssl.ignore.validity.dates=true -Djava.net.preferIPv4Stack=true
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