Generate PDF from json

Need java code that will generate PDF from a static JSON file (both files attached)

https://filetransfer.io/data-package/buQ97RVY#link

The technical specifications imply the generation of the entire document from the attachment, specifically interested in the implementation: 

• first page with a gradient
• pagination, header-footer patterns
• text formatting using html tags
• styling of Description, Remediation blocks 
• styling of the code lines block - colors, fonts, rounded corners of the table

Proposals like "how it could be" or "there is such a library" will not be accepted, only fully functional code for generating the entire pdf file, from start to finish.

Choice of java library is up to you. You are required to provide java classes that are directly responsible for generating pdf from static json, and possibly short explanations of the implementation.