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Host On-Demand J2EE Connector


Introduction to Host On-Demand J2EE Connector

Note: At the time of writing this document, Sun Microsystems J2EE Connector Architecture specification is still under development. Host On-Demand J2EE Connector is based on version 1.0 of the Sun Microsystems J2EE Connector Architecture Specification, Proposed Final Draft 2.

Before the J2EE Connector architecture was introduced, there was no standard architecture for integrating heterogeneous Enterprise Information Systems (EIS). Host On-Demand users had to use Host Access Class Library (HACL) to access hosts; other vendors provide specific architectures for this purpose. J2EE Connector architecture provides a standard set of services allowing developers to quickly connect and integrate their applications with virtually any backend EIS, and to any application servers conforming to the J2EE Connector architecture.

The Host On-Demand J2EE Connector provides access to 3270, 5250, Customer Information and Control System (CICS**), and Virtual Terminal (VT) hosts from the Internet. The Host On-Demand J2EE Connector is a Java programming interface which conforms to the J2EE Connector Specification version 1.0 - Proposed Final Draft 2 from Sun Microsystems, and the Common Connector Framework (CCF) infrastructure required by VisualAge for Java - Enterprise Access Builder and Component Broker. This interface is intended for use with these products to develop applications in a consistent manner with other connectors. This is one of the programming environments Host On-Demand customers may use. In other environments, where the customer needs the complete functionality of Host On-Demand, the HACL and JavaBeans interface should be used.

An applet or servlet uses the Host On-Demand J2EE Connector classes for host access over TCP/IP using standard telnet protocols: TN3270, TN5250, CICS or VT emulation. For 3270 and 5250 hosts, a telnet server gateway (such as IBM's Communications Server family of products) is used to translate the incoming telnet stream into an SNA datastream. Host On-Demand supports encryption of the datastream for telnet servers which support Secure Sockets Layer (SSL).


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