[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

首先找到 "Money transfer project" 示例，并结合 Java SDK 的序列化/反序列化文档检查其输入参数类。找出缺少默认构造函数的参数；完成的标准是该参数具有默认构造函数，并且示例在反序列化期间不再挂起。Issue 未指定文件或测试路径，因此必须先找到它们。