AEM HTL Quiz and Flashcards for Sling Models

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Questions and Answers

What is the purpose of the `init()` method in the `HelloWorldModelImpl` class?

To set the `authoredVal` variable to a default value
To check if the `authoredVal` variable is not blank (correct)
To initialize the `messageText` variable
To throw an exception if the `authoredVal` variable is null

What is the role of the `@ValueMapValue` annotation in the `HelloWorldModelImpl` class?

To specify a custom serialization strategy
To define a custom validation rule
To inject a value from a ValueMap (correct)
To enable caching for the `authoredVal` variable

What is the purpose of the `setMessageText()` method in the `HelloWorldModelImpl` class?

To clear the `messageText` variable
To set the `authoredVal` variable to a default value
To concatenate the `authoredVal` variable with a prefix
To set the `messageText` variable based on the `authoredVal` variable (correct)

What is the recommended approach to create a new Title component?

Create a Custom Sling Model that follows the requirement (C) Signup and view all the answers

What is the purpose of the `com.adobe.aem.guides.wknd.core.models.Byline` interface?

To implement a Sling Model for a dialog (D) Signup and view all the answers

How should the `name` field be represented in the Sling Model?

As a single-value field (D) Signup and view all the answers

What is the purpose of the `occupations` field in the Sling Model?

To store a multi-value field (C) Signup and view all the answers

Which HTL method should be used to represent the Sling Model in the UI?

<code>${name}</code> (C) Signup and view all the answers

What is the purpose of setting the nodetype field to cq:Page in a workflow?

To trigger the workflow only for nodes of type cq:Page (C) Signup and view all the answers

What is the issue with specifying a condition like jcr:content/jcr:primaryType==cq:Page in a Launcher configuration?

It is not the standard approach for a Launcher (A) Signup and view all the answers

Why is option D not a clear or standard way to configure a Launcher?

It does not specify the nodetype or required conditions (B) Signup and view all the answers

What is the main reason why the workflow should be configured to run only for nodes of type cq:Page?

To ensure the workflow runs only for AEM pages (A) Signup and view all the answers

What is the most likely cause of a build failure on the first run of mvn install in an AEM project set up using the AEM Archetype?

The adobe-public profile is not configured in settings.xml (A) Signup and view all the answers

What is the purpose of the adobe-public profile in an AEM project?

To specify the dependencies required for AEM development (B) Signup and view all the answers

What is the consequence of not having the adobe-public profile configured in settings.xml?

Maven won't be able to find the dependencies (B) Signup and view all the answers

Why is the adobe-public profile necessary for AEM projects?

To provide the dependencies required for AEM development (C) Signup and view all the answers

What is the correct approach to ensure a service component has access to the necessary user service mapping for accessing the JCR repository in AEM?

Creating a field of type ServiceUserMapped and annotating it with @Reference (C) Signup and view all the answers

What is the purpose of the data-sly-use.clientlib HTL statement in AEM?

To import the clientlib.html template for managing client-side libraries (D) Signup and view all the answers

What is the correct HTL statement to include only CSS files from a client-side library with the category 'library.example' in AEM?

data-sly-call.clientlib.css(categories='library.example') (A) Signup and view all the answers

What is the purpose of the categories parameter in the clientlib.css function in AEM?

To specify the client library category (A) Signup and view all the answers

What is the result of using the clientlib.all function with a type parameter in AEM?

It does not accept a type parameter and throws an error (A) Signup and view all the answers

What is the purpose of page templates in AEM?

To create editable templates for pages (A) Signup and view all the answers

What is the correct way to reference only the CSS files of a Client-Side Library with the category 'library.example' in HTL for AEM?

data-sly-call.clientlib.css(categories='library.example') (B) Signup and view all the answers

What is the purpose of the data-sly-call HTL statement in AEM?

To call a client library function (A) Signup and view all the answers

What type of configuration is suitable for AEM projects where configurations need to be adaptable based on the location within the content repository?

Context-Aware Configuration (C) Signup and view all the answers

What is the benefit of using buckets with OSGi configurations?

To define default configurations at the OSGi level and then override these settings for specific contexts (B) Signup and view all the answers

What is the limitation of using a Custom Cloud Configuration?

It might not offer the same level of granularity required for varying content paths (C) Signup and view all the answers

What is the purpose of using run modes in AEM?

To differentiate configurations between development and production environments (B) Signup and view all the answers

What is the recommended approach to meet the requirements of varying configurations for different staging environments, content paths, and differences between author and publish instances?

Using a context-aware configuration with buckets using an OSGi configuration (A) Signup and view all the answers

What is the disadvantage of using One OSGi Configuration for the Set of Values with Runmodes?

It does not provide flexibility to vary configurations based on content paths (A) Signup and view all the answers

What is the purpose of using the PUT method when updating a content fragment variation using the Assets HTTP API?

To ensure the server processes it as an update to an existing resource (C) Signup and view all the answers

What is the advantage of using a context-aware configuration?

It allows for flexible and hierarchical configurations that can vary based on context (A) Signup and view all the answers

What is the main advantage of using the PageManager API in AEM?

It is specifically designed for high-level operations related to AEM pages (D) Signup and view all the answers

What can be used to resolve a resource in AEM?

ResourceResolver (C) Signup and view all the answers

How can you iterate through child pages in AEM?

Using the PageManager API (D) Signup and view all the answers

What is the advantage of using the PageManager API to access page metadata?

It is more efficient and readable compared to manually iterating through nodes (D) Signup and view all the answers

What is the disadvantage of directly working with nodes in AEM?

It is more low-level and does not leverage AEM's higher-level page abstractions (C) Signup and view all the answers

How can you access the PageManager class in AEM?

It can be accessed via ResourceResolver (D) Signup and view all the answers

What is the purpose of the QueryDebugger in AEM?

It is a tool for debugging and constructing queries (C) Signup and view all the answers

What is necessary to ensure that the dispatcher caches the page and refreshes it after it gets updated?

Add the entry /0001 { /glob „-.html“ /type „allow“ } in the /invalidate section (A) Signup and view all the answers

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Study Notes

AEM Development

Model Impl: A HelloWorldModelImpl class is used to create a model that can be injected with values using the @ValueMapValue annotation.
@PostConstruct: A method annotated with @PostConstruct is called after the model is constructed, and can be used to initialize the model's properties.

Creating a New Title Component

Option B: To create a reusable Title component that meets requirements, create a custom Sling Model that overrides the default behavior, and create a model exporter.

Sling Models for Fields

Byline Interface: A developer needs to create Sling models for two fields: name (a single value field) and occupations (a multi-value field).
HTL Representation: The model should be represented in HTL using the Byline interface.

Page Management

PageManager API: The PageManager API is used for high-level operations related to AEM pages, providing a more abstract and convenient way to work with pages compared to directly dealing with nodes.
ResourceResolver: A ResourceResolver is used to resolve a resource (like a page or asset), and can be adapted to get a PageManager instance.
Iterating Through Pages: Once you have a Page object, you can iterate through its child pages, which is more efficient and readable compared to manually iterating through nodes.
Page Metadata Access: When you have a Page object, accessing page-specific properties (like the title) is straightforward, making the code cleaner and more maintainable.

Dispatcher Caching

Cache Invalidation: To ensure that the dispatcher caches the page and refreshes it after it gets updated, add the entry /0001 { /glob "*.html" /type "allow" } in the /invalidate section.

Client-Side Library

HTL Statement: To reference only the CSS files of a Client-Side Library with the category "library.example" in HTL, use the following statement: data-sly-use.clientlib and data-sly-call with clientlib.css and categories='library.example'.

Workflow Launcher

Nodetype Field: To trigger a workflow only for nodes of type cq:Page, set the nodetype field to cq:Page.

AEM Project Setup

Adobe Public Profile: When a build fails on its first run of mvn install in an AEM project set up using the AEM Archetype, the two most likely causes are:
- There is no adobe-public profile configured in settings.xml.
- The adobe-public profile dependencies are not present in the .m2 repository.

Context-Aware Configuration

Buckets with OSGi Configuration: To meet the requirements of varying configurations for different staging environments, content paths, and differences between author and publish instances, use a context-aware configuration with buckets using an OSGi configuration.

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