Java Connector Architecture

Java Connector Architecture (JCA) APIs can be used in JEE applications for communicating with enterprise integration systems (EISes), such as SAP, and Salesforce. Just like you have database drivers to broker communication between JDBC APIs and relational databases, you have JCA adapters between JCA calls and EISes. Most EIS applications now provide REST APIs, which are lightweight and easy to use, so REST could replace JCA in some cases. However, if you use JCA, you get transaction and pooling support from the JEE application server.