On Thu, Sep 20, 2001 at 10:24:07AM +1000, Jeff Turner wrote: > On Wed, Sep 19, 2001 at 09:21:15AM +0200, Ola Lundqvist wrote: > > On Wed, Sep 19, 2001 at 09:59:09AM +1000, Jeff Turner wrote: > > > On Tue, Sep 18, 2001 at 02:15:04PM -0700, Bill Wohler wrote: > [..] > > > Symlinking jars can be dangerous, because jars can contain a Class-path: > > > line in their manifests. These Class-path: lines contain relative > > > references to other jars. This causes two problems: > > > > What does this reference mean? Is it the same as adding that jar to > > the classpath? > > I think so. > > > Does it exist only in java2? > > Unfortunately yes. It was introduced as part of the 1.2 "extension > mechanism".
Damn. But maybe we can have a tool that emulates this feature for java1 too :) > http://java.sun.com/products/jdk/1.2/docs/guide/extensions/spec.html > > > If this is the case we have the solution on the dependency problem!!! > > We should just have a policy on how to name them. :) > > Hmm.. so packagers would open all program jars, twiddle their manifests, > close them again and then their classpath should be automatically > determined? Might work, except for the fact that it's not in 1.2, and it > might break the startup script. Well when the packager creates the jar it is quite easy to fix. But yes the non-free package maintainers will have to do that. > > > - If the packager has gone and renamed the jar, then Class-path: > > > references in other jars will break. > > > > > > - The Class-path: reference is relative (may contain ".."). Say you > > > have /usr/share/java/jaxp.jar, and symlink it to your VM's lib/ext > > > directory. Those relative Class-path: references are going to be > > > relative to /usr/share/java, *not* your VM directory. So even if you > > > symlink one jar to lib/ext, that jar may haul in a bunch of other > > > jars. > > > > The policy should say that every Class-path: must be relative to the > > /usr/share/java dir. Which means that they should (almost all time) > > just be the jar filename. > > An excellent idea. I'll add it to the policy in some way. But I'll wait until I know more about what we can do about this kind of issues. Regards, // Ola -- --------------------- Ola Lundqvist --------------------------- / [EMAIL PROTECTED] Björnkärrsgatan 5 A.11 \ | [EMAIL PROTECTED] 584 36 LINKÖPING | | +46 (0)13-17 69 83 +46 (0)70-332 1551 | | http://www.opal.dhs.org UIN/icq: 4912500 | \ gpg/f.p.: 7090 A92B 18FE 7994 0C36 4FE4 18A1 B1CF 0FE5 3DD9 / ---------------------------------------------------------------
