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[[ltwdump]]
= Dumping classes during load-time weaving
[[ltwdump-introduction]]
== Introduction
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 `java.lang.VerifyError`. 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 `META-INF/aop.xml` to dump the classes (by
default to an `_ajdump` 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.
[[ltw-examples]]
=== Configuring bytecode dumping in load-time weaving
For details of how to configure byte-code dumping, see the AspectJ
Development Environment Guide section on
xref:../devguide/ltw.html#configuring-load-time-weaving-with-aopxml-files[Configuring
Load-time Weaving]. Following is a simple example.
[[ltwdump-examples]]
=== LTW Dump Examples
The following `META-INF/aop.xml` will weave classes in the `com.foo`
package (and subpackages) but not CGLIB generated classes in the
`com.foo.bar` package (and subpackages). It will also ensure all woven
byte-code is dumped both before and after weaving.
[source, xml]
....
<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>
....
You should see messages similar to this:
[source, text]
....
[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'
....
On disk you would find the following files:
[source, text]
....
_ajdump/_before/com/foo/bar/Test.class
_ajdump/com/foo/bar/Test.class
....
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