[wildfly-dev] Dynamically attaching AspectJ LTW weaver from EAR

[Eric B]

Hi,

I'm looking to use AspectJ Load Time Weaving with Wildfly 10.  Looking
around at some posts, it is a little complicated to get Wildfly launched
properly with the AJ weaver due to the way the AJ library intializes the
logging subsystem differently than WF.

Digging around, I found a config that actually works.  It is documented
here (obviously some of the class names/versions have to change):
https://github.com/ChienChingLee/How-to-launch-Wildfly-9.0-with-AspectJ-1.8-LTW

But I'm not a fan of changing my conf file to something that has hardcoded
paths/jar names in it - for example adding:

-Xbootclasspath/p:$JBOSS_HOME/modules/system/layers/base/org/jboss/logmanager/main/jboss-logmanager-2.0.0.Final.jar


Digging around some more in AJ, I saw that as of AJ 1.8.7, there is a way
to dynamically attach the weaver to the JVM.  Very cool.
https://www.eclipse.org/aspectj/doc/released/README-187.html
But in order to use the LTW effectively, I need to ensure that the weaver
is loaded prior to WF scanning and loading any of my classes (EJB,
annotated beans, pojos, etc).  But I have no ideas how to do that.

In the case of a console application, it is pretty straight forward - make
it the first item in the application's main() method.  But in the case of a
JEE app, I don't know of any main() equivalent.


Is there a way to hook into the classloading mechanism of WF instead to
tell it to load the weaver if it isn't already loaded?  Can this be done
from within the EAR deployment?  Or is there a single point of entry that
WF accesses before scanning any of the classes in the EAR?  Or is there a
simpler way of configuring or attaching the AJ Weaver?  I did find an old
ticket (https://issues.jboss.org/browse/WFLY-895) that related to this
issue, but it is marked as WONT FIX.

Am not sure of the best approach at this point.


Thanks,

Eric
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