Hello,
I cannot access my installation after this upgrade 
I've upgraded since JIRA 4 and never had any issues with it. Now I've got this in my logs, which points me nowhere:
2017-01-27 09:08:14,114 http-nio-8080-exec-19 ERROR krystian 548x44x1 crr7li 192.168.88.85,127.0.0.1 /secure/MigrationSummary.jspa [o.a.c.c.C.[.[.[.[jsp.decorators.onboarding_jsp]] Servlet.service() for servlet jsp.decorators.onboarding_jsp threw exception
java.lang.AbstractMethodError
at com.atlassian.jira.plugin.webfragment.contextproviders.AbstractJiraContextProvider.getContextMap(AbstractJiraContextProvider.java:28)
at com.atlassian.plugin.web.model.AbstractWebItem.getContextMap(AbstractWebItem.java:30)
at com.atlassian.plugin.web.model.DefaultWebLabel.getDisplayableLabel(DefaultWebLabel.java:55)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:306)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:290)
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.addAll(Iterators.java:362)
at com.google.common.collect.Lists.newArrayList(Lists.java:160)
at com.google.common.collect.Lists.newArrayList(Lists.java:144)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDynamicWebItems(DefaultWebInterfaceManager.java:231)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDisplayableWebItems(DefaultWebInterfaceManager.java:214)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getLinksForSection(DefaultSimpleLinkManager.java:120)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$701(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:149)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:146)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.getLinksForSection(ThreadLocalCachingSimpleLinkManager.java:153)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.getLinksForSection(ThreadLocalCachingSimpleLinkManager.java:140)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getNotEmptySectionsForLocation(DefaultSimpleLinkManager.java:242)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$301(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:193)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:190)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.getNotEmptySectionsForLocation(ThreadLocalCachingSimpleLinkManager.java:197)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:30)
at com.sun.proxy.$Proxy421.getNotEmptySectionsForLocation(Unknown Source)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy1264.getNotEmptySectionsForLocation(Unknown Source)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.collectDisplayableSections(HelpMenuContextProvider.java:60)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.getContextMap(HelpMenuContextProvider.java:47)
at com.atlassian.plugin.web.descriptors.DefaultWebPanelModuleDescriptor$ContextAwareWebPanel.getHtml(DefaultWebPanelModuleDescriptor.java:144)
at com.atlassian.jira.plugin.headernav.ModernPluggableTopNavigation.getHtml(ModernPluggableTopNavigation.java:56)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:301)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:293)
at com.atlassian.ozymandias.SafePluginPointAccess.invokeModule(SafePluginPointAccess.java:452)
at com.atlassian.ozymandias.SafePluginPointAccess.descriptors(SafePluginPointAccess.java:150)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:293)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$1.run(HeaderFooterRendering.java:109)
at com.atlassian.ozymandias.SafePluginPointAccess.runnable(SafePluginPointAccess.java:201)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:106)
at jsp.decorators.onboarding_jsp._jspService(onboarding_jsp.java:252)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
... 140 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
2017-01-27 09:08:14,147 http-nio-8080-exec-19 ERROR krystian 548x44x1 crr7li 192.168.88.85,127.0.0.1 /secure/MigrationSummary.jspa [o.a.c.c.C.[Catalina].[localhost].[/]] Unhandled exception occurred whilst decorating page
java.lang.RuntimeException: javax.servlet.ServletException: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.opensymphony.sitemesh.webapp.decorator.BaseWebAppDecorator.render(BaseWebAppDecorator.java:37)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:92)
at com.atlassian.jira.web.filters.SitemeshPageFilter.doFilter(SitemeshPageFilter.java:112)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
... 109 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.servlet.ServletException: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:908)
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:837)
at jsp.decorators.onboarding_jsp._jspService(onboarding_jsp.java:276)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
... 26 filtered
... 117 more
Caused by: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:30)
at com.sun.proxy.$Proxy421.getNotEmptySectionsForLocation(Unknown Source)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy1264.getNotEmptySectionsForLocation(Unknown Source)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.collectDisplayableSections(HelpMenuContextProvider.java:60)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.getContextMap(HelpMenuContextProvider.java:47)
at com.atlassian.plugin.web.descriptors.DefaultWebPanelModuleDescriptor$ContextAwareWebPanel.getHtml(DefaultWebPanelModuleDescriptor.java:144)
at com.atlassian.jira.plugin.headernav.ModernPluggableTopNavigation.getHtml(ModernPluggableTopNavigation.java:56)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:301)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:293)
at com.atlassian.ozymandias.SafePluginPointAccess.invokeModule(SafePluginPointAccess.java:452)
at com.atlassian.ozymandias.SafePluginPointAccess.descriptors(SafePluginPointAccess.java:150)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:293)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$1.run(HeaderFooterRendering.java:109)
at com.atlassian.ozymandias.SafePluginPointAccess.runnable(SafePluginPointAccess.java:201)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:106)
at jsp.decorators.onboarding_jsp._jspService(onboarding_jsp.java:252)
... 146 more
Caused by: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.getLinksForSection(ThreadLocalCachingSimpleLinkManager.java:140)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getNotEmptySectionsForLocation(DefaultSimpleLinkManager.java:242)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$301(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:193)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:190)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
... 191 more
Caused by: java.lang.AbstractMethodError
at com.atlassian.jira.plugin.webfragment.contextproviders.AbstractJiraContextProvider.getContextMap(AbstractJiraContextProvider.java:28)
at com.atlassian.plugin.web.model.AbstractWebItem.getContextMap(AbstractWebItem.java:30)
at com.atlassian.plugin.web.model.DefaultWebLabel.getDisplayableLabel(DefaultWebLabel.java:55)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:306)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:290)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators.addAll(Iterators.java:362)
at com.google.common.collect.Lists.newArrayList(Lists.java:160)
at com.google.common.collect.Lists.newArrayList(Lists.java:144)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDynamicWebItems(DefaultWebInterfaceManager.java:231)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDisplayableWebItems(DefaultWebInterfaceManager.java:214)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getLinksForSection(DefaultSimpleLinkManager.java:120)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$701(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:149)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:146)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
... 205 more
2017-01-27 09:08:14,154 http-nio-8080-exec-19 ERROR [o.a.c.c.C.[.[localhost].[/].[action]] Servlet.service() for servlet [action] in context with path [] threw exception
java.lang.RuntimeException: javax.servlet.ServletException: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.opensymphony.sitemesh.webapp.decorator.BaseWebAppDecorator.render(BaseWebAppDecorator.java:37)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:92)
at com.atlassian.jira.web.filters.SitemeshPageFilter.doFilter(SitemeshPageFilter.java:112)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
... 109 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.servlet.ServletException: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:908)
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:837)
at jsp.decorators.onboarding_jsp._jspService(onboarding_jsp.java:276)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
... 26 filtered
... 117 more
Caused by: com.google.common.util.concurrent.ExecutionError: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:30)
at com.sun.proxy.$Proxy421.getNotEmptySectionsForLocation(Unknown Source)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy1264.getNotEmptySectionsForLocation(Unknown Source)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.collectDisplayableSections(HelpMenuContextProvider.java:60)
at com.atlassian.jira.plugin.headernav.HelpMenuContextProvider.getContextMap(HelpMenuContextProvider.java:47)
at com.atlassian.plugin.web.descriptors.DefaultWebPanelModuleDescriptor$ContextAwareWebPanel.getHtml(DefaultWebPanelModuleDescriptor.java:144)
at com.atlassian.jira.plugin.headernav.ModernPluggableTopNavigation.getHtml(ModernPluggableTopNavigation.java:56)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:301)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$7.visit(HeaderFooterRendering.java:293)
at com.atlassian.ozymandias.SafePluginPointAccess.invokeModule(SafePluginPointAccess.java:452)
at com.atlassian.ozymandias.SafePluginPointAccess.descriptors(SafePluginPointAccess.java:150)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:293)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering$1.run(HeaderFooterRendering.java:109)
at com.atlassian.ozymandias.SafePluginPointAccess.runnable(SafePluginPointAccess.java:201)
at com.atlassian.jira.plugin.navigation.HeaderFooterRendering.includeTopNavigation(HeaderFooterRendering.java:106)
at jsp.decorators.onboarding_jsp._jspService(onboarding_jsp.java:252)
... 146 more
Caused by: com.google.common.util.concurrent.ExecutionError: java.lang.AbstractMethodError
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.getLinksForSection(ThreadLocalCachingSimpleLinkManager.java:140)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getNotEmptySectionsForLocation(DefaultSimpleLinkManager.java:242)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$301(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:193)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$6.load(ThreadLocalCachingSimpleLinkManager.java:190)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
... 191 more
Caused by: java.lang.AbstractMethodError
at com.atlassian.jira.plugin.webfragment.contextproviders.AbstractJiraContextProvider.getContextMap(AbstractJiraContextProvider.java:28)
at com.atlassian.plugin.web.model.AbstractWebItem.getContextMap(AbstractWebItem.java:30)
at com.atlassian.plugin.web.model.DefaultWebLabel.getDisplayableLabel(DefaultWebLabel.java:55)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:306)
at com.atlassian.plugin.web.DefaultWebInterfaceManager$WebItemConverter.apply(DefaultWebInterfaceManager.java:290)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators.addAll(Iterators.java:362)
at com.google.common.collect.Lists.newArrayList(Lists.java:160)
at com.google.common.collect.Lists.newArrayList(Lists.java:144)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDynamicWebItems(DefaultWebInterfaceManager.java:231)
at com.atlassian.plugin.web.DefaultWebInterfaceManager.getDisplayableWebItems(DefaultWebInterfaceManager.java:214)
at com.atlassian.jira.plugin.webfragment.DefaultSimpleLinkManager.getLinksForSection(DefaultSimpleLinkManager.java:120)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager.access$701(ThreadLocalCachingSimpleLinkManager.java:28)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:149)
at com.atlassian.jira.plugin.webfragment.ThreadLocalCachingSimpleLinkManager$3.load(ThreadLocalCachingSimpleLinkManager.java:146)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
... 205 more
Any tips? 
Thanks
Krystian