224 IMS Connectivity in an On Demand Environment: A Practical Guide to IMS Connectivity
JNI files are, in general, DLL files, in Microsoft Windows they have the extension dll, while in
a UNIX® environment (z/OS included) the extension is
so (shared object). JNI files that are
not written in Java are often also called drivers and are required if the access to the resource
cannot be fulfilled in Java. For example, the local option provided by IMS Connector for Java
and IMS Connect uses JNI, as does JDBC™ type 2 access and DLI database access. The
TCP/IP protocol is entirely supported in Java and does not require JNI.
12.2 JCA infrastructure and API
Before any message can be sent to or received from an EIS system, a connection has to be
estab