IDEA报错:Unable to save settings Failed to save settings

  今天打开IDEA时，出现了“Unable to save settings Failed to save settings”异常，百度了一下，发现大部分都是说卸载“identifier Highlighter”插件，但是我并没有安装这个插件，所以在翻找了好久之后，终于是解决了问题，在此下一下我的解决经验。

  IDEA这个报错翻译过来就是：“保存设置失败”，至于是为什么失败，并没有在此处说明，但是IDEA把具体原因放到了他的日志文件中，所以只要我们找到了日志文件，那么就可以对症下药，解决问题！

1.寻找日志文件

  C盘—User(用户)—.IntelliJIdea文件夹—system—log—idea.log

  注意：如果电脑有多个用户，那么就是在你当前用户下的.IntelliJIdea文件夹中

2.找到报错

  打开idea.log文件，从最下面开始翻，找到最新的报错信息，那就是你遇到的真正问题，找到之后，翻译一下，基本就知道问题在哪儿了

下面列举几个报错的原因

1.这个报错是没有写入文件的权限，再看后面的“C:\Users\.idea”，说明是没有C盘的写入权限

2.此处最下面可以看到“ Cannot save scheme workspace/Jetty Server”，说明是jetty的配置有问题(此处代码转载自https://blog.csdn.net/yjw123456/article/details/78547552/)

2017-11-15 17:20:55,720 [ 196716]  WARN - mponents.impl.stores.StoreUtil - Save settings failed 
java.lang.RuntimeException: java.lang.Exception: Cannot get RunManager component state
  at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:179)
  at com.intellij.util.lang.CompoundRuntimeException.throwIfNotEmpty(CompoundRuntimeException.java:148)
  at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:199)
  at com.intellij.openapi.components.impl.stores.StoreUtil.save(StoreUtil.java:49)
  at com.intellij.openapi.project.impl.ProjectImpl.save(ProjectImpl.java:349)
  at com.intellij.openapi.components.impl.stores.StoreUtil.saveDocumentsAndProjectsAndApp(StoreUtil.java:126)
  at com.intellij.openapi.application.impl.ApplicationImpl.saveAll(ApplicationImpl.java:1437)
  at com.intellij.ide.SaveAndSyncHandlerImpl.saveProjectsAndDocuments(SaveAndSyncHandlerImpl.java:126)
  at com.intellij.ide.SaveAndSyncHandlerImpl$2.a(SaveAndSyncHandlerImpl.java:94)
  at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:86)
  at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:109)
  at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:118)
  at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122)
  at com.intellij.ide.SaveAndSyncHandlerImpl$2.onFrameDeactivated(SaveAndSyncHandlerImpl.java:92)
  at com.intellij.ide.FrameStateManagerImpl.a(FrameStateManagerImpl.java:84)
  at com.intellij.ide.FrameStateManagerImpl.access$500(FrameStateManagerImpl.java:32)
  at com.intellij.ide.FrameStateManagerImpl$2.a(FrameStateManagerImpl.java:70)
  at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:246)
  at com.intellij.util.Alarm$Request.runSafely(Alarm.java:417)
  at com.intellij.util.Alarm$Request.access$700(Alarm.java:344)
  at com.intellij.util.Alarm$Request$1.run(Alarm.java:384)
  at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:314)
  at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.a(LaterInvocator.java:416)
  at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:399)
  at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
  at java.awt.EventQueue.access$500(EventQueue.java:98)
  at java.awt.EventQueue$3.run(EventQueue.java:715)
  at java.awt.EventQueue$3.run(EventQueue.java:709)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
  at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:821)
  at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:649)
  at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.Exception: Cannot get RunManager component state
  at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:166)
  ... 38 more
Caused by: java.lang.RuntimeException: Cannot save scheme workspace/Jetty Server: jetty (level: WORKSPACE)
  at com.intellij.configurationStore.SchemeManagerImpl.save(SchemeManagerImpl.kt:535)
  at com.intellij.configurationStore.Scheme_implKt.save(scheme-impl.kt:154)
  at com.intellij.execution.impl.RunManagerImpl.getState(RunManagerImpl.kt:500)
  at com.intellij.execution.impl.RunManagerImpl.getState(RunManagerImpl.kt:63)
  at com.intellij.configurationStore.ComponentStoreImpl.a(ComponentStoreImpl.kt:227)
  at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:159)
  ... 38 more