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From Giacomo Pati <pati_giac...@yahoo.com>
Subject Re: [bug] linking error
Date Fri, 29 Sep 2000 14:49:49 GMT

--- Stefano Mazzocchi <stefano@apache.org> wrote:
> "Craig R. McClanahan" wrote:
> > 
> > Stefano Mazzocchi wrote:
> > 
> > > "Craig R. McClanahan" wrote:
> > >
> > > > > However, I agree that shared libraries are badly defined in
> the W3C/XML world.
> > > > > a) The classes from W3C were never properly packaged and
> maintained into JAR
> > > > > files. Every user tend to put them into their own JARs
> > > > > b) The same classes are not compatible between versions. I
> can not simply replace
> > > > > them with the latest version (by compiling and putting them
> in a JAR in the
> > > > > lib/ext/ directory) which would temporarily solve my
> problems.
> > > > >
> > > > > But I guess you are on top of this...
> > > >
> > > > I wouldn't say necessarily "on top of" -- more "suffering the
> consequences of" along
> > > > with everyone else :-).
> > >
> > > We appear to suffer more consequences of this than planned.
> > >
> > > Here is another pretty serious bug report:
> > >
> > > 1) downloaded Tomcat 4.0M1
> > > 2) latest Cocoon2 from CVS
> > >
> > > when executed (Sun JDK 1.3 under Win2k) I get
> > >
> > > java.lang.LinkageError: Class org/xml/sax/Attributes violates
> loader
> > > constraints
> > >         at
> > >
>
_C_._Code._apache_org._jakarta_tomcat_4_0_m1._webapps._cocoon._sitemap_xmap.setConfiguration(_sitemap_xmap.java:480)
> > >         at
> > >
> org.apache.cocoon.sitemap.SitemapHandler.run(SitemapHandler.java:149)
> > >         at java.lang.Thread.run(Thread.java:479)
> > >
> > > but if I remove xerces.jar from /lib everything works just fine.
> > >
> > > NOTE: cocoon/WEB-INF/lib *does* include Xerces_1.2.jar along with
> the
> > > right SAX classes.
> > >
> > > How about that?
> > >
> > 
> > I was able to reproduce this, but it fails for me under all three
> circumstances (xerces.jar in both places, xerces.jar
> > in $CATALINA_HOME/lib only, and xerces.jar in the Cocoon
> WEB-INF/lib only).  In the latter case, it complained about a
> > different class (org.w3c.dom.Document) instead.
> > 
> > A few comments and questions.
> > 
> > * According to the Javadocs, a LinkageError means that
> >   a class was changed this class depended on, without
> >   recompiling this class.  Is there any chance at all that the
> >   xerces.jar (from the 1.2 binary download) was not built from
> >   scratch (build clean then build dist or whatever)?
> > 
> > * I turned on debugging output in the Catalina class loader.
> >   It appears that the actual generated sitemap class is being
> >   started on another thread, using a different classloader.  If
> >   so, what class is being used, and how is it being configured?
> >   I don't know enough Cocoon internals to track this down.
> 
> Oh, shit you're right... didn't think of this...
> 
> Giacomo, did you use a different classloader for the compiling
> thread?

I don't use _any_ classloader there. It's the xsp engine which loads
it!

>  
> > * Likewise, I don't see anywhere in the code that is writing the
> >   LinkageError exception message to System.out in the first
> >   place.  Any ideas where this is coming from?  (The stack trace
> >   sent back to the browser is a NullPointerException).
> 
> It's out from the above sitemap compiling thread and the NPE is due
> to a
> bug since the two thread are not well communicating... we need to fix
> that soon.

Please tell me more :)

Giacomo

=====
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PWR GmbH, Organisation & Entwicklung      Tel:   +41 (0)1 856 2202
Giacomo Pati, CTO/CEO                     Fax:   +41 (0)1 856 2201
Hintereichenstrasse 7                     Mailto:Giacomo.Pati@pwr.ch
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