[wildfly-dev] How to put AspectJ aspects on the classpath to advise core classes in Wildfly?

[Stuart Douglas]

I think you probably want to modify the classpath and also
add -Djboss.modules.system.pkgs=org.aspectj (or whatever package aspectj
classes are under). This system property is a comma separated list of
non-modular packages that JBoss modules will just pass straight through to
the system class loader.

Stuart

On Sat, Oct 21, 2017 at 1:29 AM, Eric B <ebenzacar at gmail.com> wrote:

> I'm trying to use AspectJ to advise some core classes in
> Wildfly/undertow.  Specifically, I'm trying to advise some of the Undertow
> HttpSession methods to get some more detailed logging when Sessions are
> created/expire/etc.
>
> I've added AspectJ as a -javaagent which is launched on startup of
> Wildfly.  I had to follow some of the steps listed at: https://github.com/
> ChienChingLee/How-to-launch-Wildfly-9.0-with-AspectJ-1.8-LTW.  But it
> works; I can see that the AJ weaver is loaded and present.
>
> My problem now is that I don't know where to put my jar of aspects for it
> to be loaded/visible by the weaver for all modules.  I've managed to get it
> to work by modifying the io.undertow.servlet module, adding my jar in the
> folder and modifying the module.xml, but that only advises the
> io.undertow.servlet.* classes.  And it seems like quite an ugly hack to get
> to that.
>
> I tried creating an independent module for it, and declaring it as a
> global module in my standalone.xml, but that didn't seem to work.  Nor did
> modifying the servlet module.xml and specifying my module as a dependency.
>
> I tried to add it to the startup parameters in the standalone.conf file,
> specifying it as -classpath path/to/myaspect.jar, but that only advised the
> startup WF (org.jboss) classes and none of the modules.
>
> At the moment, I'm looking to advise any implementation of
> javax.servlet.http.HttpSession.invalidate().  In AJ language, the
> pointcut is simple: execution(* javax.servlet.http.HttpSession+.invalidate(..))
> will match any implementation of the HttpSession interface.  However, to
> make it active, I need to get that Aspect in the classpath of every module
> loaded and visible to the AJ weaver.
>
> Is there a "generic" place I can declare the the aspects.jar so that it is
> part of the classpath of every module loaded or is my only choice to modify
> every module.xml in the system?
>
> Thanks,
>
> Eric
>
>
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