Re: [aspectj-users] Weaving standard libraries

[Alexandre Vasseur <avasseur@xxxxxxxxx>]

This license snip is rather unclear.

For Java 5, it is possible to change a rt.jar class at class load time
with a JVMTI agent, or even at runtime.
For Java 3 and 4, this was already possible thru a C JVMDI/PI bytecode
instrumentation agent.
This snip only says that there is license issue when using -Xbootclasspath/p.

Note that some commercial Application Performance Management are using
this option when you install them. What I think causes an issue is if
you redistribute a modified rt.jar class.

Alex




On Thu, 21 Oct 2004 13:38:48 -0700, Adrian Powell <apowell@xxxxxxxxxx> wrote:
> 
> David, 
> 
> If you modify anything in rt.jar through aspectj (or any other tool), you
> would be violating Sun's runtime license.  In the online docs for the java
> tool, Sun says: 
> 
> -Xbootclasspath/p:path 
> Specify a semicolon-separated path of directires, JAR archives, and ZIP
> archives to prepend in front of the default bootstrap class path. Note:
> Applications that use this option for the purpose of overriding a class in
> rt.jar should not be deployed as doing so would contravene the Java 2
> Runtime Environment binary code license. 
> 
> cheers,
> -adrian.
> --
> Adrian Powell
> Centre for IBM e-Business Innovation :: Vancouver
> apowell@xxxxxxxxxx / 604-297-3194 
> 
> 
> 
> David Pearce <david.pearce@xxxxxxxxxxxxx> 
> Sent by: aspectj-users-admin@xxxxxxxxxxx 
> 
> 10/21/2004 01:02 PM 
> 
> Please respond to
> aspectj-users
> 
> 
> Toaspectj-users@xxxxxxxxxxx 
> 
> cc
> 
> SubjectRe: [aspectj-users] Weaving standard libraries
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Hi Wes,
> 
> > I haven't tried weaving rt.jar; are you having a problem with it?
> 
> Not at all!  I'm actually interested in weaving into things like e.g. 
> java.lang.String or java.lang.Thread and believe that there are certain 
> limitations on what can be done here.  What i'm looking for is something 
> telling me exactly what those limitations are.
> 
> > though we recommend against violating any license.
> 
> This suggests to me that weaving code into the standard libraries would
> be violating someone's license ?
> 
> Cheers,
> 
> Dave
> 
> > The options for ajc, the combined compiler/weaver, are documented in the
> > AspectJ development guide.  The load-time weaver is just an adapter to the
> > weaver used by ajc, and to use it you have to specify the aspectpath.
> > 
> > More generally, if there's anything you need to know about using AspectJ 
> > that's not in documentation for AspectJ, please point it out as a doc bug!
> > 
> > Thanks-
> > Wes
> > 
> > 
> >>------------Original Message------------
> >>From: Eric Bodden <eric@xxxxxxxxx>
> >>To: aspectj-users@xxxxxxxxxxx
> >>Date: Thu, Oct-21-2004 0:06 AM
> >>Subject: RE: [aspectj-users] Weaving standard libraries
> >>
> >> 
> >>-----BEGIN PGP SIGNED MESSAGE-----
> >>Hash: SHA1
> >>
> >>Hi.
> >>
> >>Generally the JARs you want to weave into have to be in the correct
> >>path parameter (the ASPECTPATH, see
> >>http://www.aspectprogrammer.org/blogs/adrian/2004/10/three_paths_sta.h
> >>tml). I don't know how load-time weaving adresses that, but I would
> >>rather assume that it makes use of the very same path concept. May
> >>anybody clarify this?
> >>
> >>Cheers,
> >>Eric
> >>
> >>David Pearce wrote:
> >>
> >>>Hi everybody,
> >>>
> >>>I have a quick question, which I'm sure has been asked many times
> >>>before.  But, I can't seem to find anything about it on the web or
> >>>from searching the archives of this list.  
> >>>
> >>>So, basically, my question is:  what are the limitations of weaving
> >>>when it comes to the java standard libraries? 
> >>>
> >>>I understand from the FAQ that AspectJ only weaves code which is
> >>>actually being compiled.  But, if I use a load-time weaver then
> >>>this should help somewhat? or not?  
> >>>
> >>>Any pointers/help would be appreciated!
> >>>
> >>>Thanks,
> >>>
> >>>David J. Pearce
> >>>_______________________________________________
> >>>aspectj-users mailing list
> >>>aspectj-users@xxxxxxxxxxx
> >>>http://dev.eclipse.org/mailman/listinfo/aspectj-users
> >>
> >>
> >>
> >>- -- 
> >>Eric Bodden
> >>Chair I2 for Programming Languages and Program Analysis
> >>RWTH Aachen University
> >>
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> >>
> >>_______________________________________________
> >>aspectj-users mailing list
> >>aspectj-users@xxxxxxxxxxx
> >>http://dev.eclipse.org/mailman/listinfo/aspectj-users
> >>
> > 
> > 
> > 
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