Gianny Damour wrote:
Hello,
I am back from holiday; A quick scan of the mailing lists tells me that
the upgrade to WADI 2.0 is causing classloader clashes.
As identified by Jason W. and Kevan, a Tribes class is loaded by two
distinct classloaders (tomcat6 and wadi-clustering configuration
classloaders), which causes CCE upon message delivery. After having
investigated this problem, it seems to me that the best way to fix it is
to split the tomcat6 dependencies into two configurations: tomcat6 and
tomcat6-tribes. tomcat6-tribes imports the tomcat6 configuration and the
tribes dependency. The new tomcat6 configuration is the current tomcat6
configuration minus the tribes dependency. Such a change will break all
the configurations defining Tribes clustering GBeans. Users having such
configurations will have to redeploy them after having added the
tromcat6-tribes configuration.
I tried a backward compatible approach where the tribes dependency was
pushed up to a parent configuration. Unfortunately, this change can only
work if WADI dependencies are also imported by this new configuration,
which is a less ideal approach than the above one.
If no one objects, I intend to check-in this change over the week-end.
I don't have any objection to these changes for trunk. However, this
does present some challenges for branches/2.1 given that the WADI 2.0
upgrade is also in that branch and users might be hoping for a nearly
seamless migration from 2.1.1 to the upcoming 2.1.2. Do we have any
idea how many users have configurations defining Tribes clustering
GBeans? I suspect it's a very small number and users could deal with
the change. We'd have to document this fairly well in the Release
Notes. I guess the only other alternative for branches/2.1 would be to
move back to one of the WADI milestone releases if we don't want to
force the migration changes in the 2.1.2 maintenance release. I'm
pretty sure that the new config and doc are the way to go for
branches/2.1 as well as trunk but just thought I'd mention the migration
issue in case there are dissenting opinions.
Thanks,
Gianny
