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转载：https://code.google.com/p/gerrit/issues/detail?id=3157
1. Migrated from 2.8.6.1 to 2.10
2. In UI go to settings >> preferences
3. change something and click "Save changes"
然后，页面报错，500 internal server error
后台日志error_log报错：
[2015-02-04 15:32:03,010] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in POST /accounts/self/preferences java.io.IOException: Keine Berechtigung at java.io.UnixFileSystem.createFileExclusively(Native Method) at java.io.File.createNewFile(File.java:1006) at java.io.File.createTempFile(File.java:1989) at org.eclipse.jgit.internal.storage.file.ObjectDirectoryInserter.newTempFile(ObjectDirectoryInserter.java:233) at org.eclipse.jgit.internal.storage.file.ObjectDirectoryInserter.toTemp(ObjectDirectoryInserter.java:199) at org.eclipse.jgit.internal.storage.file.ObjectDirectoryInserter.insert(ObjectDirectoryInserter.java:91) at org.eclipse.jgit.lib.ObjectInserter.insert(ObjectInserter.java:338) at com.google.gerrit.server.git.VersionedMetaData.saveFile(VersionedMetaData.java:418) at com.google.gerrit.server.git.VersionedMetaData.saveUTF8(VersionedMetaData.java:412) at com.google.gerrit.server.git.VersionedMetaData.saveConfig(VersionedMetaData.java:408) at com.google.gerrit.server.account.VersionedAccountPreferences.onSave(VersionedAccountPreferences.java:72) at com.google.gerrit.server.git.VersionedMetaData$1.doSave(VersionedMetaData.java:208) at com.google.gerrit.server.git.VersionedMetaData$1.write(VersionedMetaData.java:221) at com.google.gerrit.server.git.VersionedMetaData$1.write(VersionedMetaData.java:197) at com.google.gerrit.server.git.VersionedMetaData.commit(VersionedMetaData.java:147) at com.google.gerrit.server.account.SetPreferences.apply(SetPreferences.java:177) at com.google.gerrit.server.account.SetPreferences.apply(SetPreferences.java:54) at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:304) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:279) at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:269) at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:180) at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85) at com.google.gerrit.pgm.http.jetty.GetUserFilter.doFilter(GetUserFilter.java:76) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gwtexpui.server.CacheControlFilter.doFilter(CacheControlFilter.java:70) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:113) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:64) at com.google.gerrit.httpd.AllRequestFilter$FilterProxy.doFilter(AllRequestFilter.java:57) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RequestContextFilter.doFilter(RequestContextFilter.java:75) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:119) at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:133)
根据博文的内容，出错原因主要是迁移后，git版本库存放目录下的All-Projects.git目录的权限问题。
安装2.8.1时，使用的是root账户安装的；
安装2.10使用的gerrit账户安装的；
因此修改All-Projects.git目录的权限，改为gerrit：gerrit，问题解决。
gerrit: Error in POST /accounts/self/preferences
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原文地址：http://www.cnblogs.com/xiaoerlang/p/4501264.html
