There are two programming models which are used for parsing and generating JSON data in Java EE. They are:

1. Object model – The object model creates a tree that represents the JSON data in memory. The tree can then be navigated, analyzed, or modified. This approach is the most flexible and allows for processing that requires access to the complete contents of the tree. However, it is often slower than the streaming model and requires more memory. The object model generates JSON output by navigating the entire tree at once.

2. Streaming model – The streaming model uses an event-based parser that reads JSON data one element at a time. The parser generates events and stops for processing when an object or an array begins or ends, when it finds a key, or when it finds a value. Each element can be processed or discarded by the application code, and then the parser proceeds to the next event. The streaming model generates JSON output to a given stream by making a function call with one element at a time.