I struggle on this for over 3 weeks. god... my envirement Liferay CE 7.4.2 GA3 Oracle JDK 8 Windows 10 Liferay Developer Studio Version: 3.9.4.202108090632-ga5   sometime, we have to connect to another database for many reasons, system is old, they cannot provide web service..etc.   there have two ways for this purpose, DataSourceProvider and SpringBeans IMPORTANT! 1. before...