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AEM DISPATCHER STATFILE UNDERSTANDING & CACHE INVALIDATION:- AEM Developers, Infrastructure Engineers regularly come across a challenge on decoding the statfile and using it efficiently especially statfile becomes highly relevant in a multi-tenanted environment with different project teams controlling different sites. The article addresses in a simple way on how to understand the mechanisms of stat file and gives a detailed explanation of how it can be used in a multi-tenant environment model. The image for your reference as a quick overview of the data flow, before we take a deep dive. This article covers - 1 - When dispatcher serves the old version of the content. How to avoid it. 2- Cache invalidation mechanism. Assumption - If you are reading this article, I believe you would have a basic understanding of Dispatcher and it's configuration. Firstly let’s set the initial configuration for the cache invalidation section of the dis

how to clear dispatcher cache in aem ?

- April 22, 2023

How to clear dispatcher cache in aem ? As you may know, the Dispatcher cache in Adobe Experience Manager (AEM) is used to improve the performance of your website by caching static resources and pages. However, sometimes you may need to clear the cache to ensure that the latest content and changes are displayed on your website. In this blog post, we'll show you how to clear the Dispatcher cache in AEM. This method will clear the entire Dispatcher cache, including all cached pages and resources. Keep in mind that clearing the cache may affect the performance of your website, as it may take some time to rebuild the cache. Clear Cache using the Dispatcher Flush Agent You can use the Dispatcher Flush Agent. Follow these steps: Log in to your AEM instance and navigate to http://localhost:4502/etc/replication/agents.author.html . Click on the "Dispatcher Flush" agent to open the agent's configuration page. Clic

How Does S3 works with AEM ?

- June 20, 2021

How Does S3 works with AEM ? Accommodating a huge amount of assets in any content management platform is challenging. Adobe Experience Manager offers an integration with the Amazon S3 storage solution, allowing binary data for images, documents and videos to be stored in an S3 bucket. Amazon S3 is highly performant and offers nearly infinite storage capacity. When talking about terabyte storage, performance is everything. The choices made during the planning and architecting phase can literally make or break the performance of a CMS system and the websites running on it. Adobe Experience Manager offers a number of storage methods, each offering a different way of storing data. Each of these options has its strengths and weaknesses. In AEM storage the mechanisms are called Micro Kernels, or MK for short. In this article we will look at the AEM with S3 data store. For the detailed steps for S3 configuration you can refer - https://www.aemrules.com/2022/05/how-to-configure-s3-in-aem

Configure/Decoding AEM AuditLogs

- April 24, 2020

AEM Developers, Infrastructure Engineers / Dev-ops teams working in the financial domain regularly come across a challenge for event auditing in AEM. This helps in identifying most of the activities happening in AEM. Audit logs are a very effective way to debug the content issue & to know what all is happening in your environment and by whom. This article addresses in a simple way on how to enable the audit logs, its different ways, and how to understand the audit logs. This article covers the following - How can we enable Audit logs in AEM. How can we read and understand the Audit logs/ tools to use it. Audit log on file system in crx-quickstart/logs folder. Audit logs for User creation / Modification. How can you archive/purge the audit logs. How can we enable Audit logs in AEM? By Default, the Audit logs are pre-configured in AEM, for a few basic operations of DAM and for all other operations of Pages and replications activity etc.. To ge

OakAccess0000: Access denied

- April 24, 2021

ERROR :- OakAccess0000: Access denied We often observe while doing the AEM development or in live running environment we get the error code OakAccess0000 , while running a workflow or any asset upload. This impact the business as content author are unable to upload any content. Error stack trace :- Javax.jcr.AccessDeniedException: OakAccess0000: Access denied at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:232) [org.apache.jackrabbit.oak-api:1.10.6] at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:213) [org.apache.jackrabbit.oak-api:1.10.6] at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.newRepositoryException(SessionDelegate.java:669) [org.apache.jackrabbit.oak-jcr:1.10.6] at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.save(SessionDelegate.java:495) [org.apache.jackrabbit.oak-jcr:1.10.6] at org.apache.jackrabbit.oak.jcr.session.SessionImpl$8.per

Dispatcher flush from AEM UI

- April 05, 2022

How to Delete Dispatcher cache without logging into the Dispatcher servers? Our Authoring team faces day to day challenges while deleting/flush the dispatcher cache. when the changes are not visible on server. They have to be depended on the IT operations/Dev ops teams to do the same. Which some time get very much time consuming for a small work. In this article we will see it can be configure and used by Author UI itself. This will allow AEM authors (or “super authors”) to flush parts of the dispatcher cache manually without the involvement of IT Operations. How to Use 1. Log in to AEM Author 2. Download the ACS commons tool from ACS Commons Official page 3. Install the downloaded package via aem package manager. 4. Make sure you create the dispatcher flush agents on Author for all Dispatchers. from http://<<host:port>>/miscadmin#/etc/replication/agents.author, check the NOTE's part at the end of page. 5. Navigate to Tools 6. Under the acs-commmons/dispatcher-flu

How to configure s3 in AEM ?

- May 03, 2022

How to Configure S3 in AEM Configuring s3 data stores in AEM 6 In Adobe Experience Manager (AEM), binary data can be stored independently from the content nodes. The binary data is stored in a data store, whereas content nodes are stored in a node store. Both data stores and node stores can be configured using OSGi configuration. Each OSGi configuration is referenced using a persistent identifier (PID). In this article we learn the detailed steps for configuration S3 data store in AEM. You can get the architectural level understand of S3 with AEM from article - https://www.aemrules.com/2021/06/how-does-s3-works-with-aem.html Amazon S3 Data Store AEM can be configured to store data in Amazon’s Simple Storage Service (S3). It uses the org.apache.jackrabbit.oak.plugins.blob.datastore.S3DataStore.config PID for configuration. In order to enable the S3 data store functionality, a feature pack containing the S3 Datastore Connector needs to be downloaded and installed. Go to the Adob

AEM ACL and how they are evaluated

- September 26, 2021

ACL's and how they are evaluated ? AEM Developers, Infrastructure Engineers / Dev-ops teams working in any domain regularly come across a challenge for understanding the ACL & its evaluation mechanism. Adobe Experience Manager is designed to cater for content authoring of multiple sites by multiple content authors. Naturally, this process needs to be controlled by strict Access Control Lists (ACLs) to manage. AEM WCM uses Access Control Lists (ACLs) to organise the permissions being applied to the various pages. This article addresses in a simple way on how to understand the ACL's , its different ways, This article covers the following - How can we read and understand the ACL. Evaluation of user permissions. Concurrent Permission on ACL Access Control Lists are made up of the individual permissions and are used to determine the order in which these permissions are actually applied. The list is formed according to the hierarchy of the pages under consideration. How can w

How to Sync HMAC in AEM ?

- April 30, 2022

Crypto Support in AEM (Syncing HMAC among AEM instances) AEM OOTB provides a feature where we can encrypt the secured and confidential data through OOTB AEM Crypto Support and store it in a code repository in the form of OSGi configuration. Crypto Support is based on keys (hmac and master files) which are unique for each AEM instance. Encrypted text generated for the same plain-text string on one AEM instance will be different from another instance. This can raise alarms in cases where we have the same OSGi configuration values shared among Author and Publish instances under the same topology. For e.g. /apps/project/config.prod/com.day.cq.db.dbservice.xml Here DB password for Default DB Service will be same across all Prod AEM instances. So, in order to make sure that the same encrypted value works on all Prod instances, we will have to sync hmac and master files among Prod Author and Publish instances. Vital Points to know before HMAC SYNC Sync of HMAC/keys will break the AEM SSL and

AEM Security Headers

- April 30, 2020

Added Security in AEM via Headers:- In design a robust architecture AEM Architects, Developers, Infrastructure Engineers regularly come across a challenge for adding the additional security in AEM. In this article, we will understand the key security headers which can be used in webserver and give an additional layer of security for your Publish server and content. I have used Apache webserver for all the examples. This article covers - 1 - X-XSS protection 2 - HTTP Strick Transport Security 3 - X-Frame Option 4 - Content Security 1- X-XSS Protection:- X-XSS-Protection header can prevent some level of XSS (cross-site-scripting ) attacks. Configure the x-xss-protection header to 1 in your apache httpd.conf file or Vhost file if you have for all domains as applicable. <IfModule mod_headers.c> <FilesMatch "\.(htm|html)$"> #Force XSS (should be on by default in most browsers anyway)

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