KB-XXXX Plugin fails after upgrade to 18.3 with error in app server log, "Unable to find [jdbc]"

Symptoms

A plugin stops working after an upgrade to 18.3, and the following error appears in the Tomcat logs: Tomcat does not accept the 'java:' prefix in datasource context

javax.naming.NameNotFoundException: Name [jdbc/Appian] is not bound in this Context. Unable to find [jdbc].

Cause

The plugin is trying to connect to the database using a format that is no longer accepted by Tomcat. For example:

DATASOURCE_CONTEXT=java:/jdbc/Appian

Action

Tomcat does not accept the 'java:' prefix in datasource contexts.

Affected Versions

This article applies to Appian 18.3 and later.