Support for the Java Connector Architecture, which provides a standard for connecting the J2EE platform to legacy enterprise information systems (EIS), such as ERP systems, database systems, and legacy applications not written in Java.

## Package Specification

Users who want to run JE within a J2EE Application Server can use the JCA Resource Adapter to connect to JE through a standard API. The JE Resource Adapter supports all three J2EE application server transaction types:

- No transaction.
- Local transactions.
- XA transactions.

JCA also includes the Java Transaction API (JTA), which means that JE supports 2 phase commit (XA). Therefore, JE can participate in distributed transactions managed by either a J2EE server or the applications direct use of the JTA API.