It is not a best practice nor recommend way to call a servlet from scheduler. You can call a service from scheduler. Move the existing logic in Servlet to a OSGi service or write a new service and call that OSGi service in your scheduler.This promotes better separation of concerns, code reusability,...

can you try with lower version of PDF services SDK - which is compatible with slf4j version   like pdfservices-sdk-3.5.1.jar is good with slf4j 1.7.26

How did you set the OSGi configurations and run modes?

Consider checking logs and thread dumps for any long waiting threads - connection pooling. Are you using any tool to monitor your connection pool usage. This can help you see how many connections are being used at peak times and whether your application is frequently waiting for a connection to bec...

Did you check the error logs for more details?

did you try writing a Sling model to generate ID in your pattern and include in HTL like below   sling model:   @Model(adaptables = Resource.class) public class IDDModel { private static int counter = 0; public String getDynamicId() { return "elementID_" + counter++; } }   <div data-sly-use.myM...

In AEM 6.5 there is no out-of-the-box (OOTB) solution to archive and restore content fragments like there is for pages. If this is required - you have to create a custom service or event handler - before deleting a content fragment, move it to an "archive" location in the JCR repository. same for re...

can you raise a Adobe Support ticket or restore from last working back up?

what are the major changes you did before getting this error - can you track the changes? looks to be some corruption with repository. is this error in your local environment?

you might need to work with Adobe Support to allow access for this domain.