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java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187) at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:583) at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:566) at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:324) at com.google.common.collect.ImmutableList$Builder.addAll(ImmutableList.java:600) at com.atlassian.confluence.api.model.reference.ModelListBuilder.putAll(ModelListBuilder.java:113) at com.atlassian.confluence.api.model.content.Content$ContentBuilder.ancestors(Content.java:612) at com.atlassian.confluence.api.impl.service.content.factory.ContentFactory.buildFromContentConvertible(ContentFactory.java:122) at com.atlassian.confluence.api.impl.service.content.factory.ContentFactory.buildFrom(ContentFactory.java:105) at com.atlassian.confluence.api.impl.service.content.ContentServiceImpl.updateUsingApiSupport(ContentServiceImpl.java:128) at com.atlassian.confluence.api.impl.service.content.ContentServiceImpl.update(ContentServiceImpl.java:176) at sun.reflect.GeneratedMethodAccessor2672.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at com.sun.proxy.$Proxy154.update(Unknown Source) at com.atlassian.confluence.api.impl.service.content.draft.LegacyContentDraftServiceImpl.publishEditDraft(LegacyContentDraftServiceImpl.java:54) at com.atlassian.confluence.api.impl.service.content.draft.ContentDraftServiceImpl.publishEditDraft(ContentDraftServiceImpl.java:36)