How to check which all API's will be Unavailable during the AEM upgrade

Statement : Detects all the package imports that will be unsatisfied when upgrading to a specified AEM version.

Solution :

• Go to this URL : http://localhost:4502/system/console/jmx/com.adobe.aem.upgrade.prechecks%3Atype%3DPreUpgradeTasks
• Click on detectUsageOfUnavailableAPI() method
• Key in the Version of AEM planning to upgrade ex. AEM 6.4
• Click on Invoke as shown in below screenshot.
  
• It will show the list of API will be unavailable for higher version upgrade

Preupgrade AEM maintenance tasks

Statement - Task to be performed, If you are planning to upgrade the existing server to higher version

Solution :

• Go to this JMX console : http://localhost:4502/system/console/jmx/com.adobe.aem.upgrade.prechecks%3Atype%3DPreUpgradeTasks
• Click on runAllPreUpgradeTasks() Runs all the pre-upgrade maintenance tasks in short or you can individually 
• As shown in the below screenshot
  
• In the console it shows which task is running
• To Check the status of maintenance task state click on the getPreUpgradeTaskLastRunState()as shown in below screenshot.

• Execute the tasks individually and availablePreUpgradeTasksNames           
• 1. RevisionCleanupTask
  
  
  2. WorkflowPurgeTask
  
  
  3. com.day.cq.audit.impl.AuditLogMaintenanceTask
  
  
  4. GenerateBundlesListFileTask
    

• List of Preupgrade operations 

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How to refreshAll open Session in AEM

Statement : refreshAllSession

Solution :

• Go to this URL : http://localhost:4502/system/console/jmx/org.apache.jackrabbit.oak%3Aname%3Drepository+manager%2Ctype%3DRepositoryManagement
• Click on refreshAllSession(), a window will open again click on invoke 
• As shown in the below screenshot

• How to refresh all open sessions