I recently had the opportunity to work with Liferay Portal version 6.2 ga4. Liferay is a platform that allows you to create dynamic web applications using Portal technology where you can create Java Portlets. Liferay supports many different relational database systems. Our project utilized PostgreSQL. Depending on how you install Liferay, you can either pre-populate the database or let Liferay create the database during initial start up. In our project, we had the need to synchronize users to our Liferay instance from other datasources specifically from an Oracle database instance. In order to handle this synchronization, we relied on Liferay's MessageListener interface. This interface allowed us to hook into Liferay's scheduler mechanism so that we were able to use cron style scheduling. In this implementation, we queried our source database and used Liferay's API to insert, update, and delete users and roles into Liferay. During delete, we had logic to ski...
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