The bin directory of your AspectJ distribution contains a script "aj" to 
perform load-time weaving. Java classes on the CLASSPATH are loaded and 
woven with aspects on the ASPECTPATH. 
This feature is only supported on JDK 1.4 and later.

--To compile the tracing example--

 ant -f ../build.xml tracing-lt

--To run the example--

 set CLASSPATH to include "../jars/tracingApp.jar"

 aj tracing.ExampleMain

--To run the example with tracing--

 set ASPECTPATH=../jars/tracingLib.jar

 aj tracing.ExampleMain