Re: [aspectj-users] LTW weaving with foreign code

[trhouse <trhouse@xxxxxxxxx>]

It occurred to me that I can improve the quality of my question by 
putting it this way:

Suppose I ( went crazy and ) wanted to have every method call in the 
JDK  report soemthing along the lines of

 System.out.println(
         "------------------- Aspect Advice Logic --------------------");
      System.out.println(
         "In the advice attached to the call point cut");
      System.out.println("Captured target object for the method call: "
         + myObject);
      System.out.println(
         "------------------------------------------------------------");

I need just one aspect to do this, I'll call it the *.* aspect for 
obvious reasons.

How would I invoke the VM and what System variables (if any) would I 
have had to define?

I am not having trouble with aspectJ conceptually, but setting up all 
the system bits with understanding what needs to be where on my machine 
and environment and what magic incantation needs to be used and where 
has me stumped.


On 3/28/2012 2:27 PM, Andy Clement wrote:
> Hi,
>
> Best solution is to use the agent:
>
> java -javaagent:pathtoaspectj/lib/aspectjweaver.jar SomeMainClass
>
> The weaver will discover its configuration from the CLASSPATH.  It
> will look out for a file META-INF/aop.xml (or META-INF/aop-ajc.xml)
> and use that to configure the weaving.
>
> A typical aop xml might be
>
> <aspectj>
> <aspects>
>    <aspect name="SomeAspect"/>
> </aspects>
> </aspectj>
>
> But you can create one by passing -outxml when you compile the
> aspects.  The one created will simply include entries for all aspects
> it compiled.
>
> If you need to know about what is going on you can add a weaver
> section into the aspectj section:
>
> <weaver options="-debug"/>
>
> cheers,
> Andy
>
>
> On 28 March 2012 11:16, trhouse<trhouse@xxxxxxxxx>  wrote:
> > Hi all,
> >
> > I am attempting to set up some LTW with a foreign (.class files only) code
> > base.
> >
> > After having read the documentation I am not sure what is required.
> > Specifically
> >
> >
> > If I provide
> > -Djava.system.class.loader=org.aspectj.weaver.loadtime.WeavingURLClassLoader
> > as a VM option, is this sufficient or do I also need to
> >
> > 1) have to set ASPECTPATH as a system variable or is this just for
> > developing aspects?
> > 2 have to set the ASPECTJ_HOME as a system variable or is this just for
> > developing aspects when I compile with AJC?
> > 3) add aspectjrt.jar  to my CLASSPATH system variable or is this just for
> > developing aspects when I compile with AJC?
> > 4) somehow include lib/aspectjrt.jar  and aspectjweaver.jar to the runtime?
> >
> >
> > So the idea is clear, I have foreign code. I have aspects already compiled.
> > I just want to run the foreign code as usual, but have the LTW apply itself
> > and execute the aspects as appropriate.
> >
> >
> > Many thanks...
> >
> >
> >
> > _______________________________________________
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> > aspectj-users@xxxxxxxxxxx
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