The AD0-E123 exam validates your expertise as an Adobe Experience Manager Sites Developer Professional. This certification confirms your ability to design, build, and maintain scalable web experiences using Adobe Experience Manager. Whether you're advancing your career or proving hands-on competency, this guide provides a clear roadmap to exam success. Use the topics, question formats, and preparation strategies below to build confidence and master the material efficiently.
Use this topic map to guide your study for Adobe AD0-E123 (Adobe Experience Manager Sites Developer Professional) within the Adobe Experience Manager path.
The AD0-E123 exam uses multiple question types to assess both theoretical knowledge and practical decision-making in real-world AEM scenarios. Questions progress in difficulty and emphasize applied skills over memorization.
Questions become progressively more complex, requiring you to link configurations, development practices, and troubleshooting skills to solve integrated problems.
Build a structured study plan that maps each topic to weekly milestones. Allocate more time to areas where you have less hands-on experience, and use practice questions to identify knowledge gaps early. Consistent, focused review combined with practical labs will reinforce concepts and build exam confidence.
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AEM Development and Analyzing and Debugging typically account for the largest portion of exam items. These areas test both your coding ability and troubleshooting skills, which are critical for production support roles. However, all five topics are essential; weakness in Configurations or Build and Deployment can significantly impact your score.
In practice, they form a continuous cycle: Configurations establish the foundation, AEM Development builds features, Build and Deployment moves code to production, Environment Maintenance keeps systems healthy, and Analyzing and Debugging resolves issues. Understanding these connections helps you see why each topic matters and how decisions in one area affect others downstream.
Hands-on experience is invaluable for this exam. Prioritize labs that involve creating custom components, configuring dispatcher rules, and using developer tools to debug real errors. If possible, work in a development AEM instance to build templates, deploy packages, and troubleshoot replication issues. Even 4-6 weeks of consistent practical work will significantly boost your confidence and exam performance.
Many candidates underestimate the importance of Build and Deployment details, such as Maven POM configuration and package dependencies, leading to missed scenario questions. Others rush through Analyzing and Debugging questions without carefully reading log output or error messages. Finally, weak understanding of how OSGi configurations affect component behavior often results in incorrect answers on configuration-based items.
Focus on your weakest topic based on practice test results, not on reviewing areas where you already score well. Take one full-length timed practice test mid-week to identify remaining gaps, then spend 2-3 days drilling those specific areas with targeted Q&A sets. In the final 2-3 days, do lighter review and practice pacing rather than learning new material, which will help you enter the exam calm and prepared.
Review the following HTL code snippet:
use.testComponent='${com.adobe.core.models.TestComponent'@
testParam='testValue'}'>
Which two approaches correctly read the value of testParam in Sling model? (Choose two.)
In Sling Models, annotations are used to map request parameters, attributes, and properties to fields in Java classes. When an HTL script passes parameters to a Sling Model, the Sling Model can use annotations to access these parameters.
Option B uses the @RequestAttribute annotation which allows the Sling Model to retrieve an attribute that has been set on the Sling HTTP request object. This is a valid approach to read the 'testParam' if it has been set as a request attribute.
Option C uses the @Inject annotation with the name attribute specifying the name of the parameter to inject. This is another valid approach to read the 'testParam' from the request.
Option A is incorrect because @Named is not the correct annotation for retrieving request attributes or parameters.
Option D is incorrect because there is no @Prop annotation in Sling Models; it's likely confused with the @Property annotation which is not the correct one for this context either.
Which two configurations will be applied if an instance starts with the run modes author, dev, and emea7 (Choose two.)
When an AEM instance starts with specified run modes, it selects configurations from the repository that match those run modes. Run modes allow for flexible management of settings and configurations across different environments. For the instance started with 'author', 'dev', and 'emea' run modes, it would apply configurations from paths that match these run modes.
Option B, /config/author.dev.emea.noldap, is correct. This path matches all three run modes specified and would, therefore, be included.
Option D, /apps/mysite/config.author.emea.dev, is also correct. This path matches the run modes and would be applied to the instance as well.
Options A and C do not match all three run modes and therefore would not be applied.
A developer wants to customize a core component.
Which property needs to be set in the new component to achieve this goal?
When customizing a core component in AEM, setting the sling:resourceSuperType property in the new component's definition allows it to inherit features from an existing core component. This property points to the resource type of the core component that is being extended or customized. By doing so, the new component inherits the core component's logic and rendering scripts but can be customized further according to project-specific requirements.
Option A, sling:resourceType, is used to define the primary resource type for a component and does not indicate inheritance.
Option B, jcr:title, is used to give a human-readable title to a node in the JCR and is unrelated to component inheritance.
Which two options are included in the AEM service pack release notes? (Choose two.)
AEM service pack release notes typically include information that helps users understand the changes that the service pack will bring to their AEM instance. These release notes commonly include:
A) Deprecated features - This section informs users about the features that are being deprecated with the current release and guides them on migrating away from deprecated features to the recommended alternatives.
B) Known issues - This section provides information about any issues or bugs that are known at the time of the release, which might not yet be fixed. It often includes workarounds for these issues if they are available.
Option C, 'Next service pack release date,' is not typically included because release dates are subject to change and are usually communicated through official channels closer to the actual release.
Option D, 'Download link to AEM jar,' is not included in the release notes but is typically available through the Adobe Software Distribution site or Cloud Manager for AEM as a Cloud Service.
A content author has this OSGI component:
How can the content author use the Apache Felix Web OSGi console to disable the servlet?
In the Apache Felix Web Console, which is the OSGi management console of AEM, components are managed under the 'Components' tab. The provided OSGi component, a servlet in this case, can be disabled by navigating to the 'Components' tab, where all the active components are listed. Once the specific servlet is located, it can be disabled by clicking on the 'Disable' action button associated with that component. This does not remove the servlet from the system; it simply stops it from being active.
Option A is incorrect because the 'Bundle Resource Provider' tab does not deal with enabling or disabling of components.
Option B is also incorrect because the 'Services' tab provides information about services but does not provide a direct way to disable them.
