Exports failing after upgrade to 13.1

We have upgraded a project from 12.6.x to 13.1 and using single site mode. After the upgrade we noticed that autoexport files are not being written, although we do see local logged messages like…

[INFO] [talledLocalContainer] 10:39:57 INFO  autoexport is processing changes...
[INFO] [talledLocalContainer] 10:39:57 INFO  autoexporting source: core/wcm-spa-plusplus/wcm-spa-plusplus/wcm-spa-plusplus-repository-data-application [content: content/documents/wcm/card.yaml]

In additon to this, we have found that yaml exports are failing from the console. If I select a node and use the YAML export option, I am getting the following error:

[INFO] [talledLocalContainer] 16.05.2019 10:47:27 ERROR http-nio-8080-exec-2 [DefaultExceptionMapper.mapUnexpectedExceptions:170] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.WicketRuntimeException: Method onRequest of interface org.apache.wicket.behavior.IBehaviorListener targeted at org.apache.wicket.ajax.markup.html.AjaxLink$1@6edbc482 on component [AjaxLink [Component id = view-link]] threw an exception
[INFO] [talledLocalContainer] 	at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:241) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:248) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:234) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64) ~[wicket-request-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:269) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284) [wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54) [hippo-cms-login-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.FilterChainInvokingValve.invoke(FilterChainInvokingValve.java:72) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke(JCRSessionStatefulConcurrencyValve.java:56) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.SubjectBasedSessionValve.invoke(SubjectBasedSessionValve.java:58) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.SecurityValve.invoke(SecurityValve.java:177) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.LocalizationValve.invoke(LocalizationValve.java:101) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.CmsSecurityValve.invoke(CmsSecurityValve.java:59) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.InitializationValve.invoke(InitializationValve.java:37) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline.invokeValves(HstSitePipeline.java:173) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstSitePipeline.invoke(HstSitePipeline.java:155) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.core.container.HstRequestProcessorImpl.processRequest(HstRequestProcessorImpl.java:79) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.container.HstDelegateeFilterBean.doFilter(HstDelegateeFilterBean.java:465) [hst-core-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.container.DelegatingFilter.doFilter(DelegatingFilter.java:68) [hst-commons-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.hippoecm.hst.container.HstFilter.doFilter(HstFilter.java:51) [hst-commons-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [catalina.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-coyote.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800) [tomcat-coyote.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471) [tomcat-coyote.jar:8.5.32]
[INFO] [talledLocalContainer] 	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:8.5.32]
[INFO] [talledLocalContainer] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_211]
[INFO] [talledLocalContainer] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_211]
[INFO] [talledLocalContainer] 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.5.32]
[INFO] [talledLocalContainer] 	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_211]
[INFO] [talledLocalContainer] Caused by: java.lang.reflect.InvocationTargetException
[INFO] [talledLocalContainer] 	at sun.reflect.GeneratedMethodAccessor254.invoke(Unknown Source) ~[?:?]
[INFO] [talledLocalContainer] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	... 60 more
[INFO] [talledLocalContainer] Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.onehippo.cm.model.serializer.ContentSourceSerializer
[INFO] [talledLocalContainer] 	at org.onehippo.cm.engine.ConfigurationServiceImpl.exportContent(ConfigurationServiceImpl.java:673) ~[hippo-repository-engine-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at org.onehippo.cms7.services.ProxiedServiceHolder.lambda$new$0(ProxiedServiceHolder.java:68) ~[hippo-services-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at com.sun.proxy.$Proxy161.exportContent(Unknown Source) ~[?:?]
[INFO] [talledLocalContainer] 	at org.hippoecm.frontend.plugins.console.menu.content.YamlExportDialog$1.onClick(YamlExportDialog.java:74) ~[hippo-cms-console-frontend-13.1.0.jar:13.1.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:85) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:155) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:601) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	at sun.reflect.GeneratedMethodAccessor254.invoke(Unknown Source) ~[?:?]
[INFO] [talledLocalContainer] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_211]
[INFO] [talledLocalContainer] 	at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258) ~[wicket-core-7.11.0.jar:7.11.0]
[INFO] [talledLocalContainer] 	... 60 more

I have found that the XML Export option is still functioning. Only the YAML export throws this error.
I have verified that the ./target/tomcat9x/webapps/cms/WEB-INF/lib/hippo-configuration-management-model-13.1.0.jar file is getting deployed and that looks like the location of org.onehippo.cm.model.serializer.ContentSourceSerializer mentioned in the error.

Are additional upgrade steps necessary for autoexport and manual YAML export to function?

Thanks,
Troy Rackley

One of our clients faced similar issue, in their case they had hardcoded dependency for:

org.yaml
snakeyaml
1.18

In your case probably some dependency is either missing or your have some other wrong version being pulled. I would compare my dependency tree with the one of clean archetype project and check if right versions are being pulled.

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