AD0-E137 Adobe Experience Manager Sites Developer Expert Questions and Answers

Explanation (Adobe Docs Reference):

AEM provides Generic Analytics Snippet functionality to allow marketing/analytics teams to manage third-party tracking scripts directly through the AEM UI, without needing a development release cycle. This enables non-developers to add or update scripts (e.g., analytics tags, marketing pixels) safely.

Option A is incorrect: Hardcoding the script in HTL means dev releases are required for every change.

Option B is incorrect: Page policies control design configurations and allowed components, not scripts.

Option C is correct: Generic Analytics Snippet is designed for this scenario.

Adobe Documentation:

“AEM provides a generic analytics snippet component that allows administrators to add and manage third-party tracking codes outside of the development cycle.”

— AEM Sites – Generic Analytics Snippet

The RepoInit feature is the correct solution. RepoInit scripts allow developers to define repository initialization instructions in a declarative manner. With RepoInit, engineers can register namespaces, create folders, define service users, configure access control lists (ACLs), and create groups — all in one script. Option A, Ensure Authorizable, is limited to ensuring users or groups exist but does not handle namespaces or folder creation. Option C, OnDeploy Scripts, is not recommended for these tasks, as RepoInit is the standard, supported, and maintainable approach for repository initialization in AEM. Adobe documentation highlights RepoInit as the best practice for managing repository initialization in both AEM 6.5 and AEM as a Cloud Service.

Explanation (Adobe Docs Reference):

The correct OSGi Declarative Services (DS) implementation in AEM:

Must use implements (not extends).

Must register the service interface (SimpleService.class).

Should return an implementation for getMessage().

Option D is the correct implementation.

Options A, B, C are wrong because:

A incorrectly uses extends.

B and C register the wrong service type (MySimpleService).

Adobe Documentation:

“An OSGi service implementation must implement its interface and be annotated with @Component(service=Interface.class) to register the service.”

— OSGi Services in AEM

Explanation (Adobe Docs Reference):

The recommended way to bind servlets in AEM (OSGi DS) is via the @SlingServletResourceTypes annotation.

The methods value must be uppercase "GET".

doGet() method must use SlingHttpServletRequest and SlingHttpServletResponse instead of standard Servlet API request/response.

SlingAllMethodsServlet is safe for handling multiple HTTP verbs, but you can extend SlingSafeMethodsServlet too. However, in Adobe docs examples, the uppercase "GET" with doGet(SlingHttpServletRequest, SlingHttpServletResponse) is correct.

In AEM’s Template Editor, there are multiple modes that allow template authors to configure different aspects of templates. The Structure mode defines static and editable areas in templates. The Page Policy allows defining rules such as which components are available for use. However, the Layout mode is specifically designed for defining grid settings for different devices. With Layout mode, template authors can configure responsive layouts and grid behavior across breakpoints such as desktop, tablet, and mobile. This ensures consistent responsive design and adaptability across devices. Adobe documentation specifies that “Layout mode allows authors to configure responsive grid layouts for different breakpoints, ensuring that pages render appropriately on devices of varying screen sizes.” This mode is essential for enabling adaptive and responsive designs in AEM projects. Options B and C do not allow for device-specific grid settings and thus are not correct.

In AEM as a Cloud Service, indexes must be defined and deployed as part of the project code base. The recommended approach is to extend or customize the out-of-the-box (OOTB) indexes by modifying the Oak index definitions and deploying them via Maven and Cloud Manager pipelines. This ensures that indexes are version-controlled, consistently deployed across all environments (Dev, Stage, Prod), and aligned with CI/CD practices. Option B is incorrect because replicating index packages via Package Manager is not supported in AEM as a Cloud Service. Option C is valid in scenarios where entirely new indexes are needed, but the question specifies that the index is based on existing search requirements. Adobe documentation emphasizes customizing existing indexes as the most efficient way to support project-specific queries.

To optimize queries against DAM assets with custom properties, developers must extend the existing damAssetLucene index. The correct method is to add the custom property under:

oak:index/damAssetLucene/indexRules/dam:Asset/properties. This ensures that the property is indexed for all assets and avoids traversal queries. Option B refers to a non-existent lucene index path, and Option C incorrectly suggests adding a property value (Hello) instead of the property name. Adobe’s indexing guidelines specify that extending existing Lucene indexes such as damAssetLucene is the standard approach for asset-related queries. This ensures queries remain efficient, scalable, and compatible across environments.

Two important weekly maintenance tasks for repository health are:

Datastore Garbage Collection (A): Cleans up unreferenced binaries in the datastore, preventing unnecessary growth in storage size.

Online Revision Cleanup (D): Reclaims space in the segment store by compacting revisions and removing obsolete data.

Option B, Clientlib Dumps, does not affect repository size. Option C, Version Purge, should be scheduled daily rather than weekly for continuous health. Adobe’s official guidelines recommend combining datastore GC with revision cleanup to prevent segment store bloat and performance degradation, ensuring repositories remain lean and optimized.

Text pre-extraction is recommended during reindexing of existing Lucene indexes that have binary extraction enabled. Binary extraction is the process where text content is extracted from binary files (such as PDFs or Word documents) for indexing. During reindexing, extracting text repeatedly from large binaries can cause performance degradation. Pre-extraction allows text to be extracted once and reused during indexing, significantly reducing reindexing time and system load. Option B is incorrect because small repositories don’t require pre-extraction optimization. Option C is also incorrect, as images generally don’t involve binary text extraction unless paired with OCR. Adobe highlights pre-extraction as a performance optimization technique for reindexing scenarios involving binary text content.

Workflow launchers in AEM are designed to monitor changes in specific repository paths such as /content, /content/dam, and /conf. However, changes under certain system-level paths, including /var, do not trigger workflows. This restriction is intentional, as /var is used for system-generated and internal data such as workflow instances, audit logs, and temporary nodes. Triggering workflows on changes under /var could result in recursive or unintended behavior. Option A is unrelated because Workflow Process Legacy Mode refers to backwards compatibility. Option B is incorrect, as AEM does allow system nodes under /var, but they are not workflow-launcher enabled. Adobe documentation makes clear that workflow launchers must be configured under supported content paths for them to execute correctly.

The error clearly indicates that the bundle is exporting a package without specifying a version. In OSGi, best practices dictate that every exported package must declare a version in the Export-Package manifest header. Furthermore, consumers of these packages must use Import-Package with version ranges to ensure compatibility and avoid conflicts during runtime. The absence of a version means other bundles cannot reliably resolve the correct package version, leading to potential deployment issues. Option A and D are general dependency resolution checks but do not address the specific missing version. Option B relates to conflicts with AEM-provided bundles, which is not the cause here. The correct fix is to add a version to the Export-Package declaration and ensure imports define version ranges. Adobe explicitly highlights this as part of OSGi bundle troubleshooting.

In Dispatcher configuration, request filtering is handled through the filters.any file. To deny access to specific content types or formats (like .json and .xml) for certain paths, the configuration must explicitly match both the extension and the path using correct syntax. The valid approach uses:

/0001 { /type "deny" /extension "(xml|json)" /path "(/path2|/path3)/*" }

Options A and B contain syntax errors. Option A incorrectly uses JSON/* instead of paths, and Option B mixes array-style brackets instead of regex or path expressions. Option C follows the correct pattern of specifying deny rules with /extension and /path. Adobe recommends always explicitly denying unwanted selectors or extensions to prevent exposure of sensitive content through JSON or XML requests.