I just stumbled upon this error in gitblit.stderr.log. For further investigations it would be useful to know which repository caused this error
org.eclipse.jgit.errors.MissingObjectException: Missing blob 0000000000000000000000000000000000000000
at org.eclipse.jgit.internal.storage.file.WindowCursor.getObjectSize(WindowCursor.java:167)
at com.gitblit.models.PathModel$PathChangeModel.from(PathModel.java:181)
at com.gitblit.utils.DiffUtils$DiffStat.addPath(DiffUtils.java:169)
at com.gitblit.utils.DiffStatFormatter.format(DiffStatFormatter.java:48)
at com.gitblit.utils.JGitUtils.getFilesInCommit(JGitUtils.java:1052)
at com.gitblit.utils.JGitUtils.getFilesInCommit(JGitUtils.java:985)
at com.gitblit.utils.RefLogUtils.getRefLog(RefLogUtils.java:467)
at com.gitblit.utils.RefLogUtils.getRefLog(RefLogUtils.java:417)
at com.gitblit.utils.RefLogUtils.getLogByRef(RefLogUtils.java:538)
at com.gitblit.wicket.panels.ReflogPanel.<init>(ReflogPanel.java:71)
at com.gitblit.wicket.pages.ReflogPage.<init>(ReflogPage.java:38)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.apache.wicket.session.DefaultPageFactory.createPage(DefaultPageFactory.java:188)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:89)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:305)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:320)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:234)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1279)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1358)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1465)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)
at com.gitblit.servlet.EnforceAuthenticationFilter.doFilter(EnforceAuthenticationFilter.java:99)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)
at com.gitblit.servlet.ProxyFilter$1.doFilter(ProxyFilter.java:89)
at com.gitblit.servlet.ProxyFilter.doFilter(ProxyFilter.java:92)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:88)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)
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.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
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:499)
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(Unknown Source)
I just stumbled upon this error in gitblit.stderr.log. For further investigations it would be useful to know which repository caused this error