Just for future reference, if other people come across the same, I have indeed managed to successfully instrument rt.jar. The exceptions I was experiencing had actually to do with some double-weaving that I was doing. I was weaving the rt.jar but I had forgotten that I had also weaved a jaxws library which I was also using.
That was causing some sort of problem, but it doesn't really matter in the end as I didn't mean to have the jaxws library woven at this point. Thanks again for the clarification! Cheers, Tiago 2011/3/16 Tiago Espinha <ti...@apache.org> > A-ha! When I faced those issues, I googled and I found a lot of people > facing issues with weaving into the JDK so I thought it was an actual > limitation of AspectJ. But from what you say, it seems like the only problem > has to do with loadtime weaving but instrumenting a JAR should be fine. > > Well, that's certainly good news and tomorrow I'll give it another try. > Maybe this exception I'm facing has to do with something else... > > Anyway, thanks a lot! > > Cheers, > Tiago > > > 2011/3/16 Andy Clement <andrew.clem...@gmail.com> > >> > What makes it so different from instrumenting any other JAR? >> >> These classes are loaded by a classloader that does not get a chance >> to attach a weaver, when using javaagent - so loadtime weaving isn't >> possible. With care, you can do what you have done, weave rt.jar and >> use that new version. The trouble is that it can be easy to cause >> yourself problems if you, for example, weave String but also use >> String (perhaps inadvertently) in your aspect - easy to create >> stackoverflow issues. I don't know why you have a NoSuchMethodError >> though. >> >> But I know others have done the weaving successfully - hopefully one >> of them can follow up my post :) >> >> cheers >> Andy >> >> On 16 March 2011 06:19, Tiago Espinha <ti...@apache.org> wrote: >> > Hi all, >> > I've been looking around the Internet, and it seems like it's impossible >> (or >> > at least failure-prone) to weave aspects into JDKs. I did it myself - I >> > instrumented the rt.jar file from the latest Oracle JDK for Linux - and, >> > whilst the weaving goes seemingly fine, I hit failures on runtime with >> such >> > exceptions as NoSuchMethodError, relating to the aspect I wove. >> > What I cannot understand is the reason why JDK instrumentation is >> > impossible. What makes it so different from instrumenting any other JAR? >> And >> > does anyone know if there are workarounds to it? >> > Thanks in advance! >> > Cheers, >> > Tiago >> > _______________________________________________ >> > aspectj-users mailing list >> > aspectj-users@eclipse.org >> > https://dev.eclipse.org/mailman/listinfo/aspectj-users >> > >> > >> _______________________________________________ >> aspectj-users mailing list >> aspectj-users@eclipse.org >> https://dev.eclipse.org/mailman/listinfo/aspectj-users >> > >
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