I have a draft review cannot be viewed. When trying to view this change I get a "Code Review - Error, 500 Internal server error". There is a NullPointerException in the log (see below). This review had a number of revisions, and after deleting some of the revisions it's not possible to access it any longer.
I have tried, but failed, to reproduce the problem with a new clean review.
Affected Version: 2.11.4 (also seen in 2.11.2)
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From error_log:
[2015-10-22 10:09:48,369] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in GET /changes/4662/detail?O=404
java.lang.NullPointerException
at com.google.gerrit.server.project.SubmitRuleEvaluator.setPatchSet(SubmitRuleEvaluator.java:126)
at com.google.gerrit.server.change.Submit.checkSubmitRule(Submit.java:544)
at com.google.gerrit.server.change.Submit.problemsForSubmittingChanges(Submit.java:258)
at com.google.gerrit.server.change.Submit.getDescription(Submit.java:280)
at com.google.gerrit.server.change.Submit.getDescription(Submit.java:89)
at com.google.gerrit.server.extensions.webui.UiActions$2.apply(UiActions.java:92)
at com.google.gerrit.server.extensions.webui.UiActions$2.apply(UiActions.java:62)
at com.google.common.collect.Iterators$8.transform(Iterators.java:799)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:651)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at com.google.gerrit.server.change.ActionJson.toActionMap(ActionJson.java:96)
at com.google.gerrit.server.change.ActionJson.addRevisionActions(ActionJson.java:63)
at com.google.gerrit.server.change.ChangeJson.toRevisionInfo(ChangeJson.java:906)
at com.google.gerrit.server.change.ChangeJson.revisions(ChangeJson.java:840)
at com.google.gerrit.server.change.ChangeJson.toChangeInfo(ChangeJson.java:415)
at com.google.gerrit.server.change.ChangeJson.format(ChangeJson.java:238)
at com.google.gerrit.server.change.ChangeJson.format(ChangeJson.java:227)
at com.google.gerrit.server.change.ChangeJson.format(ChangeJson.java:206)
at com.google.gerrit.server.change.GetChange.apply(GetChange.java:46)
at com.google.gerrit.server.change.GetDetail.apply(GetDetail.java:50)
at com.google.gerrit.server.change.GetDetail.apply(GetDetail.java:26)
at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:324)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:287)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:277)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:182)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
at com.google.gerrit.httpd.GetUserFilter.doFilter(GetUserFilter.java:82)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gwtexpui.server.CacheControlFilter.doFilter(CacheControlFilter.java:73)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:117)
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)
at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:130)
at com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:203)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:130)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:744)