4.3.0 Upgrade Guide

Resource Classloaders Now Load Classes Child-First By Default

Resources now load classes "child-first" instead of "parent-first" by default. In cases where a resource uses a class that is already included with Mirth Connect (for example a PostgreSQL driver), previously the class from the parent classloader was loaded instead of the custom class that the user wanted to use. By loading "child-first" now, users can achieve the desired behavior.

If you still need to load "parent-first", you can enable the "Load Parent-First" option on individual resources.