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Oracle WebLogic Server 11g Administration Handbook by Sam Alapati

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Configuring WLDF Instrumentation

You can use the Instrumentation component of WLDF to insert diagnostic code into both the server instances and the applications you deploy. Application-scoped instrumentation lets you configure instrumentation at the server level and within the applications you deploy.

The concept of instrumentation is analogous to aspect-oriented programming, which allows generating additional byte code into the application. The term “instrumentation” is often used to refer to the addition of code that uses System.out.println to help diagnose functional problems. For performance, System.out.printIn is often paired with timing code that takes the currentTimeMillis method both before and after an operation is completed and prints ...

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