Jackson 2.12.1 blocks deserialization of gadget needed in openidm-repo-jdbc

[krystofNovotny]

Version: 22.1.0-SNAPSHOT

The class of concern is JDBCDataSourceService.

After upgrade of jackson-databind to 2.12.1 in wrensec-parent, I stumbled uphon an issue FasterXML/jackson-databind#2410 - meaning deserialization of com.zaxxer.HikariConfig is now prohibited.

As a workaround, usage of this class was replaced by HikariConfigEx subclass which is empty, but changes the type to dodge being blocked by jackson's SubTypeValidator.

This solution is dirty and requires further investigation - possibly completely changing the way configuration is deserialized.

The result of this issue should be a proposal of a clean solution for this problem.