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Backward Compatibility with the previous AEM Version is out of scope for the Pattern Detector tool, while doing an AEM upgrade. The Pattern Detector tool is a tool that scans an existing AEM code base and identifies patterns that are incompatible with AEM as a Cloud Service or newer versions of AEM on-premise. The tool does not check for backward compatibility with older versions of AEM, as this is not a requirement for upgrading. References:

AEM as a Cloud Service does not support custom OSGi configuration runmodes, such as “config.author.staging”. Only specific OSGi configuration runmodes, such as “config.author” or “config.publish”, are supported. These runmodes are used to apply configurations to specific services, such as author or publish. The specific runmodes can be combined with environment variables to achieve different configurations for different environments. References:

To create Sling Models that can export data in a human-readable yaml format, the following steps are required:

Create Sling models to export as yaml. Sling models are Java classes that can be used to represent resources in AEM. Sling models can use annotations to define how they can be adapted from a resource and how they can export data in different formats. To export data in yaml format, the Sling model class needs to use the @Model annotation with the resourceType parameter set to the resource type of the resource that the model represents. The Sling model class also needs to implement the org.apache.sling.models.annotations.Exporter annotation with the name parameter set to “jackson” and the extensions parameter set to “yaml”. The Sling model class also needs to use the @JsonProperty annotation on the fields or methods that need to be exported in yaml format.

Configure mime type in Apache Sling MIME Type Service. The Apache Sling MIME Type Service is an OSGi service that maps file extensions to MIME types and vice versa. To enable the yaml format for Sling models, the MIME Type Service needs to be configured with a new entry for the yaml extension and its corresponding MIME type, which is “application/x-yaml”. This can be done by creating an OSGi configuration for the org.apache.sling.commons.mime.internal.MimeTypeServiceImpl service and adding the entry “yaml=application/x-yaml” to the mime.types property. References: