The stand-alone JRas logging toolkit defines interfaces and provides a variety of concrete classes that implement these interfaces. Since the stand-alone JRas logging toolkit was developed as a general purpose toolkit, the implementation classes do not contain the configuration interfaces and methods necessary for use in the WAS product. In addition, many of the implementation classes are not written appropriately for use in a J2EE environment. To overcome these shortcomings, WebSphere Application Server provides the appropriate implementation classes that allow integration into the WAS environment. The collection of these implementation classes is referred to as the JRas extensions.
Use the JRas extensions in three distinct operational modes...
Integrated In this mode, message and trace records are written only to logs defined and maintained by the WAS runtime. This is the default mode of operation and is equivalent to the WebSphere Application Server 4.0 mode of operation.
stand-alone In this mode, message and trace records are written solely to stand-alone logs defined and maintained by the user. You control which categories of events are written to which logs, and the format in which entries are written. You are responsible for configuration and maintenance of the logs. Message and trace entries are not written to WebSphere Application Server runtime logs.
Combined In this mode message and trace records are written to both WAS runtime logs and to stand-alone logs that define, control, and maintain. Use filtering controls to determine which categories of messages and trace are written to which logs.
The JRas extensions are specifically targeted to an integrated mode of operation. The integrated mode of operation can be appropriate for some usage scenarios, but there many scenarios are not adequately addressed by these extensions. Many usage scenarios require a stand-alone or combined mode of operation instead. A set of user extension points has been defined that allow the JRas extensions to be used in either a stand-alone or combined mode of operations.
See AlsoJRas extension classes
Extending the JRas framework
Programming model summary