[Feature Request] Default constructor on an input parameter 'Money transfer project'

Is your feature request related to a problem? Please describe.

Customer Miro reported below:
'I started writing a basic "mocked up" data migration based on the "Money transfer project" and the Java SDK documentation.   Its been going slowly since I got stuck on the problem below, unfortunately. The problem I hit was related to serialization/deserialization and is lightly documented (and not included in any of the examples).  This is as simple as forgetting to create a default constructor on say an input parameter.  If this happens the test just hangs forever.'

Describe the solution you'd like

Create a default constructor on an input parameter

Additional context

Start by locating the "Money transfer project" sample and reviewing its input parameter classes alongside the Java SDK serialization/deserialization documentation. Identify the parameter that lacks a default constructor; done means it has one and the sample no longer hangs during deserialization. The issue names no file or test path, so those must be found first.