The IMS Java function provides IMS's implementation of the JDBC API. Application programs that use the JDBC interface to access IMS issue SQL calls and might run on a non-z/OS platform.

The IMS Java function allows you to write Java application programs that access IMS databases and IMS message queues from many different locations:

• Within IMS
• Any environment that supports the JDBC API
• IBM WebSphere Application Server for z/OS
• WebSphere Application Server running on a non-z/OS platform
• IBM Customer Information Control System (CICS) Transaction Server for z/OS
• IBM DB2 Universal Database for z/OS stored procedures

Figure 3 illustrates an Enterprise JavaBean (EJB) that can perform work on the IMS checking account database. Notice that in Figure 3, IMS does not require an application program to issue DL/I calls.

Figure 3. Example of an EJB that Accesses an IMS Database Through the JDBC Interface

Figure 3 includes the following components:

• DL/I.
• DRA: The database resource adapter (DRA) is the bridge between ODBA and IMS.
• ODBA: Open Database Access (ODBA) is the IMS callable interface for access to IMS DB.
• IMS JDBC resource adapter: The IMS JDBC resource adapter that is deployed on the z/OS platform. The IMS JDBC resource adapter is delivered with the IMS Java function.
• IMS Java EJB: One of two IMS Java-supplied EJBs is the host-side component that facilitates communication with and passes transaction information to the IMS JDBC resource adapter. These EJBs act as listeners for remote requests.
• WebSphere Application Server for z/OS.
• IIOP: Internet Inter-ORB Protocol (IIOP) is the protocol that can be used between WebSphere Application Server for z/OS and WebSphere Application Server running on another platform. IIOP allows the servers to exchange data. Data is securely transferred across the Internet using the SSL (Secure Sockets Layer) protocol.
• IMS distributed JDBC resource adapter: The resource adapter that is deployed on the non-z/OS platform, which contains a type-3 JDBC driver and is delivered with the IMS Java function.
• EJB: The EJB enterprise application that contains your business logic and is deployed on WebSphere Application Server.
• WebSphere Application Server: WebSphere Application Server on which the client application runs.
• non-z/OS platform: The operating system that hosts WebSphere Application Server.