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= `aj`, the AspectJ load-time weaving launcher
== Name
`aj` - command-line launcher for basic load-time weaving
== Synopsis
[subs=+quotes]
aj [_Options_] [_arg_...]
[[aj]]
== Description
The `aj` command runs Java programs in Java 1.4 or later by setting up
`WeavingURLClassLoader` as the system class loader, to do load-time
bytecode weaving.
The arguments are the same as those used to launch the Java program.
Users should define the environment variables `CLASSPATH` and
`ASPECTPATH`.
For more information and alternatives for load-time weaving, see
xref:ltw.adoc#ltw[Load-Time Weaving].
== Examples
Use ajc to build a library, then weave at load time
[source, text]
....
REM compile library
${ASPECTJ_HOME}\bin\ajc.bat -outjar lib\aspects.jar @aspects.lst
REM run, weaving into application at load-time set
ASPECTPATH=lib\aspects.jar set CLASSPATH=app\app.jar
${ASPECTJ_HOME}\bin\aj.bat com.company.app.Main "Hello, World!"
....
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