Editing JEE (section)

==JCA==
The J2EE Connector architecture provides a Java technology solution to the problem of connectivity between the many application servers and today's enterprise information systems (EIS). The J2EE Connector architecture defines a standard architecture for connecting the J2EE platform to heterogeneous EIS systems. Examples of EIS systems include ERP, mainframe transaction processing, database systems, and legacy applications not written in the Java programming language. The J2EE Connector architecture enables an EIS vendor to provide a standard resource adapter for its EIS. The resource adapter plugs into an application server, providing connectivity between the EIS, the application server, and the enterprise application. An EIS vendor needs to provide just one standard resource adapter which has the capability to plug in to any application server that supports the J2EE Connector architecture. Multiple resource adapters (that is, one resource adapter per type of EIS) are pluggable into an application server. To achieve a standard system-level pluggability between application servers and EISs, the J2EE Connector architecture defines a standard set of system-level contracts between an application server and EIS. The resource adapter implements the EIS-side of these system-level contracts. An application server and an EIS collaborate to keep all system-level mechanisms, such as transactions, security, and connection management, transparent from the application components.

The J2EE Connector architecture (Version 1.0) defines the following set of system-level contracts:
* connection management
* transaction management
* security contract

The J2EE Connector architecture (Version 1.5) defines the following set of system-level contracts:
* transaction inflow contract
* message inflow contract
* lifecycle management
* work management