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Re: [aspectj-users] LTW for bootstap classes
- From: Alexander Kriegisch <Alexander@xxxxxxxxxxxxxx>
- Date: Mon, 05 Feb 2007 21:03:06 +0100
- Delivered-to: firstname.lastname@example.org
- Organization: Scrum-Master.de - Agiles Projektmanagement
- User-agent: Thunderbird 188.8.131.52 (Windows/20061207)
I think that large parts of AspectJ's documentation need updating - and
no, I am not volunteering, because I am still just a slightly advanced
beginner at best. I several places there are phrases like: "In v1.0 this
is so-and-so, in 1.1 we intend to do it like this."
In this particular case the piece of documentation I quoted is
inaccurate and creates misunderstandings. I think it is similar in
several other places. Anyway, you clarified this issue for me, and I am
fine with doing it via reflection for the time being. It actually works
like a charm already. Good hint, thanks. :-)
Ron Bodkin schrieb:
> Hi Alexander,
> At this time AspectJ won't apply load-time weaving to bootstrap-loaded
> classes at all. It should be possible to do so for a fairly large subset of
> classes, but it would require changing (and testing!) the AspectJ code base
> so that the LTW system handles null ClassLoaders correctly everywhere. For
> calling a non-public method, I'd suggest you try using reflection,
> specifically get that method and invoke setAccessible(true) to allow calling
> it. For other uses of aspects with the bootstrap loader, you might consider
> using call pointcuts with LTW or in the worst case preprocessing the
> bootstrap classes to weave them.
> -----Original Message-----
> From: aspectj-users-bounces@xxxxxxxxxxx
> [mailto:aspectj-users-bounces@xxxxxxxxxxx] On Behalf Of Alexander Kriegisch
> Sent: Saturday, February 03, 2007 9:36 AM
> To: aspectj-users@xxxxxxxxxxx
> Subject: [aspectj-users] LTW for bootstap classes
> I read the following in the AspectJ 5 LTW documentation
>> The following classes are not exposed to the LTW infrastructure
>> regardless of the aop.xml file(s) used:
>> - All org.aspectj.* classes (and subpackages) - as those are needed
>> by the infrastructure itself
>> - All java.* and javax.* classes (and subpackages)
>> - All sun.reflect.* classes - as those are JDK specific classes used
>> when reflective calls occurs
> Having understood that much, I thought that I might give some other
> classes inside rt.jar a try. Specifically, I tried to call the
> non-public constructor
> sun.security.rsa.RSAPrivateKeyImpl(BigInteger, BigInteger)
> from a privileged aspect.
> I suddeed doing so by weaving into the classfiles, producing copies of
> all JRE bootstrap classes in my project's 'bin' directory. but that is
> not what I want, because I would much prefer to tackle the challenge
> using LTW. It just won't work, though.
> I would appreciate hints concerning the following questions:
> - Can it be done by LTW at all?
> - If so, how? I want to call the constructor and assign the resulting
> object to a member of another regular Java class, so it can work
> with that instance.
> - Last, but not least, I would like to do this from Eclipse 3.2 with
> AJDT installed. I could not come up with a project and start
> configuration properly addressing this issue.