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<chapter id="ltwdump" xreflabel="Dumping classes during load-time weaving">
<title>Dumping classes during load-time weaving</title>
<sect1 id="ltwdump-introduction">
<title>Introduction</title>
<para>
Very rarely problems may be encountered with classes that have been
load-time woven.
Symptoms will include incorrect program function or a Java exception such as
<literal>java.lang.VerifyError</literal>.
In these situations it's most helpful to include the offending class
in the bug report. When using load-time weaving the woven classes are
in memory only so to save them to disk configure
<literal>META-INF/aop.xml</literal> to dump the classes (by default
to an <literal>_ajdump</literal> subdirectory of the current working
directory). Also if the input class file is not available
(e.g. it is a generated proxy or has already been instrumented by another agent)
you can configure the weaver to dump the input classes as well.
</para>
<sect2 id="ltw-examples" xreflabel="ltwdump-configuration">
<title>Configuring bytecode dumping in load-time weaving</title>
<para>
For details of how to configure byte-code dumping, see the
AspectJ Development Environment Guide section on
<ulink url="../devguide/ltw-configuration.html#configuring-load-time-weaving-with-aopxml-files">
Configuring Load-time Weaving</ulink>.
Following is a simple example.
</para>
</sect2>
<sect2 id="ltwdump-examples" xreflabel="LTW Dump Examples">
<title>LTW Dump Examples</title>
<para> The following <literal>META-INF/aop.xml</literal> will
weave classes in the <literal>com.foo</literal> package (and subpackages) but not
CGLIB generated classes in the <literal>com.foo.bar</literal> package (and subpackages).
It will also ensure all
woven byte-code is dumped both before and after weaving. </para>
<programlisting><![CDATA[
<aspectj>
<aspects>
<aspect name="ataspectj.EmptyAspect"/>
</aspects>
<weaver options="-verbose -debug">
<dump within="com.foo.bar..*" beforeandafter="true"/>
<include within="com.foo..*"/>
<exclude within="com.foo.bar..*CGLIB*"/>
</weaver>
</aspectj>
]]></programlisting>
<para> You should see messages similar to this: </para>
<programlisting><![CDATA[
[WeavingURLClassLoader] info AspectJ Weaver Version 1.5.3 built on Thursday Oct 26, 2006 at 17:22:31 GMT
[WeavingURLClassLoader] info register classloader org.aspectj.weaver.loadtime.WeavingURLClassLoader
[WeavingURLClassLoader] info using configuration /C:/tempMETA-INF/aop.xml
[WeavingURLClassLoader] info register aspect ataspectj.EmptyAspect
[WeavingURLClassLoader] debug not weaving 'com.foo.bar.Test$$EnhancerByCGLIB$$12345'
[WeavingURLClassLoader] debug weaving 'com.foo.bar.Test'
]]></programlisting>
<para> On disk you would find the following files: </para>
<programlisting><![CDATA[
_ajdump/_before/com/foo/bar/Test.class
_ajdump/com/foo/bar/Test.class
]]></programlisting>
</sect2>
</sect1>
</chapter>
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