yes, this is possible since 6.4.xhere an article I wrote about this; Using OSGi R7 annotations in AEM - Experience Delivers

OpenJDK is not supported, look here what is exactly supported: Technical Requirements

I would strongly recommend this: Versioned ClientLibs

Can you check if the bundle is active on publish?Via /system/console/bundles

Example here htl-examples/request-parameter.html at master · heervisscher/htl-examples · GitHub

sure, you can do the same via the JS-api

The way to do this is to have a category per component

Here the list of uber-jar versions Index of /groups/public/com/adobe/aem/uber-jar

You should really only need the uber-jar.like this:<dependency><groupId>com.adobe.aem</groupId><artifactId>uber-jar</artifactId><version>6.4.2</version><classifier>apis</classifier><scope>provided</scope></dependency>

Since HTL1.4 you can now also use data-sly-set.Example here: htl-examples/htl1_4.html at master · heervisscher/htl-examples · GitHub