Two problems at upgrade Intellij to v2018.1

check log: /Users/aborn/Library/Logs/IntelliJIdea2018.1/idea.log

1 Cannot start maven service; nested exception is

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 (Connection refused)
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)

Fix: add a record 127.0.0.1 localhost to /etc/hosts

2 java.lang.NoSuchMethodError: com.intellij.openapi.projectRoots.impl.SdkVersionUtil.readVersionFromProcessOutput

2018-04-02 21:16:05,565 [3118499] ERROR - llij.ide.plugins.PluginManager - OS: Mac OS X
2018-04-02 21:16:05,860 [3118794] ERROR - til.concurrency.QueueProcessor - com.intellij.openapi.projectRoots.impl.SdkVersionUtil.readVersionFromProcessOutput(Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
java.lang.NoSuchMethodError: com.intellij.openapi.projectRoots.impl.SdkVersionUtil.readVersionFromProcessOutput(Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
at com.zeroturnaround.javarebel.idea.plugin.runner.args.SdkAdapter.isIBM(SdkAdapter.java:30)
at com.zeroturnaround.javarebel.idea.plugin.runner.args.SdkAdapter.needsRebelBootstrap(SdkAdapter.java:36)
at org.zeroturnaround.jrebel.client.JRebel.getInstallationArgs(JRebel.java:248)
at com.zeroturnaround.javarebel.idea.plugin.activation.JRebelIntellij.getJVMArgAdditions(JRebelIntellij.java:27)
at com.zeroturnaround.javarebel.idea.plugin.runner.JRebelRunUtils.getArgChanges(JRebelRunUtils.java:77)
at com.zeroturnaround.javarebel.idea.plugin.runner.JRebelRunUtils.patch(JRebelRunUtils.java:67)
at com.zeroturnaround.javarebel.idea.plugin.runner.JRebelDebugRunnerCommon.patch(JRebelDebugRunnerCommon.java:40)
at com.zeroturnaround.javarebel.idea.plugin.runner.JRebelDebugRunner.patch(JRebelDebugRunner.java:62)

Fix: this problem cased by the low version of JRebel, how to fix?
Uninstall the JRebel plugin or upgrade JRebel plugin to latest version.

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