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From "Ate Douma (JIRA)" <jetspeed-...@jakarta.apache.org>
Subject [jira] Commented: (JS2-210) Resolving all deployment classloader problems
Date Wed, 02 Mar 2005 14:05:49 GMT
     [ http://issues.apache.org/jira/browse/JS2-210?page=comments#action_60046 ]
Ate Douma commented on JS2-210:

I've (re)implemented a very simple decorator deployer now.
Undeployment is, like with PA deployment, not available yet.

It works almost the same as the "old" version except it doesn't use the (InMemory)SimpleRegistry
Redeployment is therefore a bit different.
It now only undeploys an existing decorator with the same "id" and "decorates" property.
If you redeploy a decorator with a different "decorates" value the previous won't be undeployed!

> Resolving all deployment classloader problems
> ---------------------------------------------
>          Key: JS2-210
>          URL: http://issues.apache.org/jira/browse/JS2-210
>      Project: Jetspeed 2
>         Type: Improvement
>   Components: Container, Deployment, Portlet Factory
>     Versions: 2.0-dev/cvs, 2.0-M2, 2.0-FINAL
>     Reporter: Ate Douma
>     Assignee: Ate Douma

> The current implementation of handling deployment, redeployment and undeployment of Portlet
Applications (PAs) contains
> several workarounds to prevent file locking of jars and classes on Windows and to allow
layout portlets to run under
> the Jetspeed-2 context.
> After almost a day debugging and testing I found the real cause of all the problems we
try to fix: 
> our own URLClassLoaders we create to be able to access the portlet and portlet resource
bundles in the PA.
> As a test, I replaced our own URLClassLoaders with the contextClassLoader from the PA,
retrieved during the init
> of the JetspeedServletContainer. And viola, no more problem!
> I'm going to drastically refactor the whole deployment implementation to be able to *only*
use the PA contextClassLoaders.
> The autodeployment from the deploy folder will be changed to infuse the PA war (if needed)
and *move* it to the webapps
> folder so the autodeployment of the application server will handle the real deployment.
> Thus: the undeployment from the deploy folder for PAs will be gone!
> Redeployment will still work as expected though.
> For undeployment, an new undeployment feature in the PAM Portlet will be added.
> Additionally, other PA management features like upload/start/stop/reload/ should be added
soon too. We need a separate
> issue for that though.
> Decorators (and soon layouts too) will still be handled as is done right now (they don't
involve classloaders).
> For deployment of layout portlets I want to make the following changes:
> - must be deployed as jar, *not* as war
> - can *only* contain classes, no resources
> - resources required by a layout portlet must be deployed separately with a decorators
or layouts jar
> - will *not* be deployed as web app but the jar *will* be loaded with a URLClassloader
with the portal classloader
>   as parent: the portlets will be invoked through a JetspeedContainerServlet from the
portal itself.
> These changes will also fix the outstanding problem with running Jetspeed-2 under a different
> (see JS2-172 and JS2-182)
> I'm going to need several days to perform this refactoring so if anyone has problems
with this plan please do comment within the next few days!

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