Hi, I had the same issue with maven-scr-plugin 1.21.0, I'm now using version 1.26.2 and am not seeing the error or warnings.

If needed you can also cache the response from the rest calls on the backend for example using Guava Cache

In your cq:editConfig node add the following property:  cq:actions of type String[] then you can define what actions you want to allow, notice this sample value that allows edit, copy, move delete and insert: edit, -, copymove, delete, -, insert, -

Change your Apache Sling Logging Logger Configuration to INFO.  or change the log statement line #87 tolog.error("Here in execute method");  to ensure it is getting executed.

Was a component node added to the jcr on that page as a result of dragging the component on to the page? Also, it might be useful to share some details of your component and/or try stripping out most of the logic out to test out a basic component.