Install resource adapters in your applications so they can access outside data
sources.
Before you begin
The JCA Version 1.6 specification adds support for Java annotations in RAR modules.
Procedure
- Assemble an application with RAR modules in it. See the topic Assembling applications for
more information.
-
Install the application. Follow the steps in the topic Installing a new application.
In the Map modules to servers step, specify target servers or clusters for each RAR file.
Be sure to map all other modules that use the resource adapters defined in the RAR modules to the
same targets. Also, specify the web servers as targets that serve as routers for requests to this
application. The plug-in configuration file (plugin-cfg.xml
) for each web server is
generated based on the applications that are routed through it.
In the Metadata for modules step of installing an application, you can set or unset the
metadata-complete flag as discussed in the topic, JCA 1.6 support for annotations in RAR
modules.
Note: When installing a RAR file on a server, the application server looks for the manifest
(MANIFEST.MF) for the connector module. The application server first looks for the RAR file's
connectorModule.jar file and loads the manifest from the
connectorModule.jar file.
If the class path entry is in the manifest from the
connectorModule.jarfile, the RAR uses
that class path.
To ensure that the installed connector module finds the classes and resources
that it needs, check the Class path setting for the RAR using the administrative console. For more
information on how to check this setting, see the topics Resource adapter settings and WebSphere
relational resource adapter settings.
- Click Finish > Save to save the changes.
- Create connection factories for the
newly installed application.
Results
Note: A given native library can only be loaded one time for each instance of the Java™ virtual
machine (JVM). Because each application has its own class loader, separate applications with
embedded RAR files cannot both use the same native library. The second application receives an
exception when it tries to load the library.
If any application deployed on the application server
uses an embedded RAR file that includes native path elements, then you must always ensure that you
shut down the application server cleanly, with no outstanding transactions. If the application
server does not shut down cleanly it performs recovery upon server restart and loads any
required RAR files and native libraries. On completion of recovery, do not attempt any
application-related work. Shut down the server and restart it. No further recovery is attempted by
the application server on this restart, and normal application processing can proceed.