This video shows a simple way to convert JSON documents to Plain Old Java Objects (POJO) using jsonschema2pojo.org. The skill of creating a Java class is not terribly difficult, but it can take time to do it right. This video will speed up the process.
All you need to do is copy the JSON to the page. Create the package and class names that you want to use. Set the settings as you desire. The class is built using proper Java.