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<refentry id="aj-ref" xreflabel="The aj Command-line Reference">
<refnamediv>
<refname>aj</refname>
<refpurpose>command-line launcher for basic load-time weaving</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>aj</command>
<arg><replaceable>Options</replaceable></arg>
<group>
<arg><replaceable>arg...</replaceable></arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="aj" xreflabel="aj">
<title>Description</title>
<para>The
<command>aj</command> command runs Java programs in Java 1.4 or
later by setting up
<literal>WeavingURLClassLoader</literal> as the system class
loader, to do load-time bytecode weaving. </para>
<para> The arguments are the same as those used to launch the Java program.
Users should define the environment variables
<literal>CLASSPATH</literal> and
<literal>ASPECTPATH</literal>. </para>
<para>For more information and alternatives for load-time weaving,
see <xref linkend="ltw"/>.
</para>
<refsect2>
<title>Examples</title>
<example id="simpleajexample">
<title>A simple example</title>
<para>Use ajc to build a library, then weave at load time</para>
<programlisting><![CDATA[
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!"
]]> </programlisting>
</example>
</refsect2>
</refsect1>
</refentry>
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