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    <title>idea MSM-Core fails to start in AEM 6.4.2 if cq:master is empty. in Adobe Experience Cloud Ideas</title>
    <link>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idi-p/343529</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi all,&lt;/P&gt;&lt;P&gt;This is more of a feedback to AEM team.&lt;/P&gt;&lt;P&gt;Just did an upgrade to AEM 6.3 to 6.4 of a production system, all went well in the first upgradestep to 6.4.0. However when installing SP 6.4.2 the system never started properly.&lt;/P&gt;&lt;P&gt;After a massive debug process, it turned out that we had a couple of sites where the cq:master attribute in LiveSyncConfig was empty, this caused the msm-core to fail during startup with the following dump:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;------------------&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;22.10.2018 12:50:19.912 *ERROR* [qtp1785523215-65] com.day.cq.wcm.cq-msm-core bundle com.day.cq.wcm.cq-msm-core:5.11.38 (432)[com.day.cq.wcm.msm.impl.LiveCopyServiceImpl(5773)] : The activate method ha&lt;/SPAN&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;s thrown an exception (javax.jcr.RepositoryException: Not an absolute path: )&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;javax.jcr.RepositoryException: Not an absolute path:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.getOakPathOrThrow(SessionImpl.java:152) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.access$100(SessionImpl.java:82) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl$1.performNullable(SessionImpl.java:186) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl$1.performNullable(SessionImpl.java:182) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.performNullable(SessionDelegate.java:243) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.getNodeOrNull(SessionImpl.java:182) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.nodeExists(SessionImpl.java:313) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.adobe.granite.repository.impl.CRX3SessionImpl.nodeExists(CRX3SessionImpl.java:188) [com.adobe.granite.repository:1.4.88]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 8pt;"&gt;&lt;STRONG style="font-family: 'courier new', courier;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.day.cq.wcm.msm.impl.LiveCopyFinderProvider.buildBloomFilter(LiveCopyFinderProvider.java:331) [com.day.cq.wcm.cq-msm-core:5.11.38]&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.day.cq.wcm.msm.impl.LiveCopyServiceImpl.activate(LiveCopyServiceImpl.java:96) [com.day.cq.wcm.cq-msm-core:5.11.38]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at java.lang.reflect.Method.invoke(Method.java:498)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:228) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:664) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:510) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:317) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:307) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:334) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;-----------------&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;In order to find the fault, you search for the following using crxde:&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;SELECT * FROM [cq:LiveSyncConfig] AS s WHERE ISDESCENDANTNODE([/content]) AND s.[cq:master] = ''&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Change the master refernce to something useful and that does exist!&lt;/P&gt;&lt;P&gt;The code cannot handle the situation where a reference is missing or is pointing to something invalid, and therefor AEM never starts properly.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Mon, 22 Oct 2018 16:02:06 GMT</pubDate>
    <dc:creator>pegr69</dc:creator>
    <dc:date>2018-10-22T16:02:06Z</dc:date>
    <item>
      <title>MSM-Core fails to start in AEM 6.4.2 if cq:master is empty.</title>
      <link>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idi-p/343529</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi all,&lt;/P&gt;&lt;P&gt;This is more of a feedback to AEM team.&lt;/P&gt;&lt;P&gt;Just did an upgrade to AEM 6.3 to 6.4 of a production system, all went well in the first upgradestep to 6.4.0. However when installing SP 6.4.2 the system never started properly.&lt;/P&gt;&lt;P&gt;After a massive debug process, it turned out that we had a couple of sites where the cq:master attribute in LiveSyncConfig was empty, this caused the msm-core to fail during startup with the following dump:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;------------------&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;22.10.2018 12:50:19.912 *ERROR* [qtp1785523215-65] com.day.cq.wcm.cq-msm-core bundle com.day.cq.wcm.cq-msm-core:5.11.38 (432)[com.day.cq.wcm.msm.impl.LiveCopyServiceImpl(5773)] : The activate method ha&lt;/SPAN&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;s thrown an exception (javax.jcr.RepositoryException: Not an absolute path: )&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;javax.jcr.RepositoryException: Not an absolute path:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.getOakPathOrThrow(SessionImpl.java:152) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.access$100(SessionImpl.java:82) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl$1.performNullable(SessionImpl.java:186) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl$1.performNullable(SessionImpl.java:182) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.performNullable(SessionDelegate.java:243) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.getNodeOrNull(SessionImpl.java:182) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.jackrabbit.oak.jcr.session.SessionImpl.nodeExists(SessionImpl.java:313) [org.apache.jackrabbit.oak-jcr:1.8.7]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.adobe.granite.repository.impl.CRX3SessionImpl.nodeExists(CRX3SessionImpl.java:188) [com.adobe.granite.repository:1.4.88]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 8pt;"&gt;&lt;STRONG style="font-family: 'courier new', courier;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.day.cq.wcm.msm.impl.LiveCopyFinderProvider.buildBloomFilter(LiveCopyFinderProvider.java:331) [com.day.cq.wcm.cq-msm-core:5.11.38]&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at com.day.cq.wcm.msm.impl.LiveCopyServiceImpl.activate(LiveCopyServiceImpl.java:96) [com.day.cq.wcm.cq-msm-core:5.11.38]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at java.lang.reflect.Method.invoke(Method.java:498)&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:228) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:664) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:510) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:317) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:307) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:334) [org.apache.felix.scr:2.1.0.B008]&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-family: 'courier new', courier; font-size: 8pt;"&gt;-----------------&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;In order to find the fault, you search for the following using crxde:&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;SELECT * FROM [cq:LiveSyncConfig] AS s WHERE ISDESCENDANTNODE([/content]) AND s.[cq:master] = ''&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Change the master refernce to something useful and that does exist!&lt;/P&gt;&lt;P&gt;The code cannot handle the situation where a reference is missing or is pointing to something invalid, and therefor AEM never starts properly.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 22 Oct 2018 16:02:06 GMT</pubDate>
      <guid>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idi-p/343529</guid>
      <dc:creator>pegr69</dc:creator>
      <dc:date>2018-10-22T16:02:06Z</dc:date>
    </item>
    <item>
      <title>Re: MSM-Core fails to start in AEM 6.4.2 if cq:master is empty.</title>
      <link>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idc-p/343530#M219</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;A href="https://experienceleaguecommunities.adobe.com/people/kautuksahni"&gt;kautuksahni&lt;/A&gt;​ - Can you ensure this is accounted for with the AEM product teams?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 23 Jul 2019 20:41:21 GMT</pubDate>
      <guid>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idc-p/343530#M219</guid>
      <dc:creator>jantzen_b</dc:creator>
      <dc:date>2019-07-23T20:41:21Z</dc:date>
    </item>
    <item>
      <title>Re: MSM-Core fails to start in AEM 6.4.2 if cq:master is empty.</title>
      <link>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idc-p/343531#M220</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;A href="https://experienceleaguecommunities.adobe.com/people/jantzen.belliston"&gt;jantzen.belliston&lt;/A&gt;​, Thanks for notifying me about this thread. &lt;/P&gt;&lt;P&gt;&lt;A href="https://experienceleaguecommunities.adobe.com/people/pegr69"&gt;pegr69&lt;/A&gt; Request you to please create this questions on &lt;A href="https://forums.adobe.com/space/5429"&gt;Adobe Experience Manager&lt;/A&gt; . &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 24 Jul 2019 12:03:06 GMT</pubDate>
      <guid>https://experienceleaguecommunities.adobe.com/t5/adobe-experience-cloud-ideas/msm-core-fails-to-start-in-aem-6-4-2-if-cq-master-is-empty/idc-p/343531#M220</guid>
      <dc:creator>kautuk_sahni</dc:creator>
      <dc:date>2019-07-24T12:03:06Z</dc:date>
    </item>
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