IntelliJ maven 无法打开项目

[mattshma]

在以 maven 方式导入一个项目时，IntelliJ 一直卡在这里：

点击下一步无反应。以 gradle 方式能成功导入，猜测是 maven 问题，修改 “Enviroment settings” 中的 maven 的配置，无效。无奈查看 IntelliJ 的log（位于 /Users/xxx/Library/Logs/IntelliJIdea2016.3），有如下报错：

Caused by: java.rmi.RemoteException: Cannot start maven service; nested exception is:
        java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused
        at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:173)
        at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:78)
        at org.jetbrains.idea.maven.server.RemoteObjectWrapper.getOrCreateWrappee(RemoteObjectWrapper.java:41)
        at org.jetbrains.idea.maven.server.MavenServerManager$7.execute(MavenServerManager.java:558)
        at org.jetbrains.idea.maven.server.MavenServerManager$7.execute(MavenServerManager.java:555)
        at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:76)
        ... 23 more
Caused by: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
        at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:342)
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at com.intellij.execution.rmi.RemoteProcessSupport.b(RemoteProcessSupport.java:257)
        at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:226)
        at com.intellij.execution.rmi.RemoteProcessSupport.a(RemoteProcessSupport.java:255)
        at com.intellij.execution.rmi.RemoteProcessSupport.acquire(RemoteProcessSupport.java:161)
        at org.jetbrains.idea.maven.server.MavenServerManager.create(MavenServerManager.java:170)
        ... 28 more

网卡查了下，是 localhost 映射的问题，查看 /etc/hosts:

127.0.0.1	localhost
::1             localhost

将 ::1 localhost 这行注释，再次导入项目，成功。