aj
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# aj

## Name

aj — command-line launcher for basic load-time weaving

## Synopsis

`aj` [`Options`] [`arg...`]

## 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 Load-Time Weaving.

### Examples

Example 2.5. A simple example

Use ajc to build a library, then weave at load time

        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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