In shorthand: What are the implications then?
- "a block context" is addressable within the sitemap
  load resource from another block context is possible via 'classpath'.
  The root of every block is available on the classpath?
- different web applications relying on cocoon3 can deploy blocks with the same name
  they won't interfere with each other?

On Fri, Dec 7, 2012 at 12:56 PM, Robby Pelssers <> wrote:
I might have time to check this weekend but I can't guarantee it.


-----Original Message-----
From: Francesco Chicchiriccò []
Sent: Friday, December 07, 2012 12:50 PM
Subject: Re: [DISCUSS] Fix for COCOON3-105

Hi all,
any reaction on this? Shall I just apply such huge patch without anyone else's confirmation??!?


On 03/12/2012 16:38, Francesco Chicchiriccò wrote:
> Hi all,
> I have finally elaborated a fix for COCOON3-105 and now I am able to
> run more C3-based webapps in the same servlet container.
> I have also added a comment explaining the way I have fixed the issue:
> as you can see, it is a considerable change, so I'd like to get your
> feedback before applying.
> Please take a look and let me know.
> Regards.
> On 03/12/2012 16:31, Francesco Chicchiriccò (JIRA) wrote:
>>      [
>> jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=1
>> 3508800#comment-13508800
>> ]
>> Francesco Chicchiriccò commented on COCOON3-105:
>> ------------------------------------------------
>> Please evaluate the attached patch (COCOON3-105.patch).
>> The patch is quite pervasive and I've seen that it might also cause
>> some troubles when applying: if you find any .rej or .orig files
>> (after application), please remove.
>> This patch basically removes any reference to the blockcontext:/
>> protocol - as you can see there is no more dependency on
>> cocon-block-deployment.
>> The blockcontext:/ protocol has been replaced by a classpath:/
>> protocol implementation, working together with the JVM's jar:/ protocol.
>> I have also prepared a demo project for this [1]: after having "mvn
>> clean install" on the patched C3 source tree, just clone, switch to
>> branch COCOON3-105 and compile by running
>> mvn clean package
>> then launch via
>> mvn cargo:run
>> You will get an Apache Tomcat instance listening on 8888 containing
>> two distinct C3 webapps; access URLs are
>> http://localhost:8888/mywebapp/
>> http://localhost:8888/mywebapp2/mysite/
>> http://localhost:8888/mywebapp2/mysite2/
>> e.g. 3 distinct blocks across 2 distinct webapps.
>> Please note that this fix should also work for C2.2, as far as the
>> ClasspathURLStreamHandlerFactory class is provided - I've put this
>> class in cocoon-servlet but we can think to move it to
>> cocoon-servlet-service-impl, for example.
>> [1]
>>> webapp fails if on the same servlet container is a c2.2.1 or other
>>> c3 webapp running
>>> --------------------------------------------------------------------
>>> -----------------
>>>                  Key: COCOON3-105
>>>                  URL:
>>>              Project: Cocoon 3
>>>           Issue Type: Bug
>>>           Components: cocoon-webapp
>>>     Affects Versions: 3.0.0-beta-1
>>>             Reporter: Thorsten Scherler
>>>             Assignee: Francesco Chicchiriccò
>>>             Priority: Blocker
>>>              Fix For: 3.0.0-beta-1
>>>          Attachments: COCOON3-105.npe.diff, COCOON3-105.patch,
>>> COCOON3-105.patch, cocoon-block-deployment.patch,
>>> cocoon-servlet-service-impl.patch
>>> I noticed that you cannot run 2 c3 based war in a tomcat.
>>> To reproduce:
>>> - seed parent via archetype
>>> - seed block in parent via archetype
>>> - seed block2 in parent via archetype
>>> - seed webapp in parent via archetype
>>> - seed webapp2 in parent via archetype where webapp depends on block
>>> one and webapp2 depends on block2.
>>> My sample was:
>>> [INFO] Reactor Summary:
>>> [INFO]
>>> [INFO] myparent .......................................... SUCCESS
>>> [1.163s] [INFO] myblock ...........................................
>>> SUCCESS [3.611s] [INFO] mywebapp
>>> .......................................... SUCCESS [1.924s] [INFO]
>>> myblock2 .......................................... SUCCESS [1.498s]
>>> [INFO] mywebapp2 ......................................... SUCCESS
>>> [1.230s] [INFO]
>>> --------------------------------------------------------------------
>>> ----
>>> Now take a tomcat (I used 6) and first deploy the mywebapp. You can
>>> copy it before you start to webapp or if you have it enable deploy
>>> it on a running instance. You should see the welcome page under
>>> something like http://localhost:8080/mywebapp-1.0-SNAPSHOT/
>>> side note: http://localhost:8080/mywebapp-1.0-SNAPSHOT will throw a
>>> StringIndexOutOfBoundsException but that is another ticket I guess.
>>> Now if you deploy the second webapp on a running instance it will
>>> deploy without problem but requesting
>>> http://localhost:8080/mywebapp2-1.0-SNAPSHOT/
>>> will return a blank page and in
>>> /.../tomcat/work/Catalina/localhost/mywebapp-1.0-SNAPSHOT/cocoon.log
>>> you find:
>>> 2012-09-13 22:12:46,056 ERROR http-8080-1
>>> org.apache.cocoon.servlet.XMLSitemapServlet - Can't initialize the
>>> RequestProcessor correctly.
>>> org.apache.cocoon.sitemap.SitemapBuilder$SitemapBuilderException:
>>> Can't build sitemap from blockcontext:/myblock2/sitemap.xmap
>>>     at
>>> 0) ~[cocoon-sitemap-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
>>>     at
>>> org.apache.cocoon.servlet.RequestProcessor.initializeSitemap(Request
>>> ~[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
>>> ...
>>> Caused by: java.lang.RuntimeException: There is no block 'myblock2'
>>> deployed. The available blocks are
>>> {myblock=file:/home/thorsten/src/apache/apache-tomcat-6.0.20/work/Catalina/localhost/mywebapp-1.0-SNAPSHOT/blocks/myblock/}.
>>>     at
>>> org.apache.cocoon.blockdeployment.BlockContextURLConnection.getConne
>>> ction(
>>> ~[cocoon-block-deployment-1.2.1.jar:1.2.1]
>>>     at
>>> org.apache.cocoon.blockdeployment.BlockContextURLConnection.getInput
>>> Stream(
>>> ~[cocoon-block-deployment-1.2.1.jar:1.2.1]
>>>     at ~[na:1.6.0_30]
>>>     at
>>> 5) ~[cocoon-sitemap-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
>>>     ... 46 common frames omitted
>>> As you see the blockcontext from the 2nd app is the one from the
>>> first EVEN if they are deployed as 2 different webapps!
>>> Now stop the tomcat and start again.
>>> Depending which app you request on a fresh stared tomcat that one
>>> will work the other will present a blank page and the log will say
>>> something like:
>>> Caused by: java.lang.RuntimeException: There is no block 'myblock'
>>> deployed. The available blocks are
>>> {myblock2=file:/home/thorsten/src/apache/apache-tomcat-6.0.20/work/Catalina/localhost/mywebapp2-1.0-SNAPSHOT/blocks/myblock2/}.
>>> In this case I requested the 2nd first.
>>> Originally I found out because we have a client that has some c3 and
>>> a c2.2.1 app (not) running aside. So in case you create a 2.2.1
>>> webapp from the archetype as described
>>> and use it instead of the
>>> c3 2nd webapp you will get similar results.
>>> If you start first with the 1st c3 and then deploy the c2.2 on the
>>> run then you can actually see both working ONLY if you first request
>>> the c3 and then deploy and then see the c2. In case you do not
>>> request the c3 prior it will not work once you requested the c2
>>> (which maybe present interesting for the cause of the problem).
>>> Now shutdown and start with both deployed the c2.2 always works and
>>> the c3 not.
>>> I see the problem for our client coming when we introduced
>>> <listener-class>org.apache.cocoon.blockdeployment.BlockDeploymentSer
>>> vletContextListener</listener-class>
>>> The main observation is that the c2 one seems to much more
>>> presistence but that can come the way of invocation (on-demand vs.
>>> startup). Anyway the blockcontext should never be shared between two
>>> different servlets.

Francesco Chicchiriccò

ASF Member, Apache Syncope PMC chair, Apache Cocoon PMC Member

All generous minds have a horror of what are commonly called "Facts". They are the brute beasts of the intellectual domain.
-- Thomas Hobbes