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From "Thorsten Scherler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COCOON3-105) webapp fails if on the same servlet container is a c2.2.1 or other c3 webapp running
Date Sun, 16 Sep 2012 22:06:07 GMT

    [ https://issues.apache.org/jira/browse/COCOON3-105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456689#comment-13456689
] 

Thorsten Scherler commented on COCOON3-105:
-------------------------------------------

The problem lies in in org.apache.cocoon.blockdeployment.BlockContextURLStreamHandlerFactory.createURLStreamHandler
here we create a  BlockContextURLStreamHandler extends URLStreamHandler

Regarding URLStreamHandler 
/**
 * The abstract class <code>URLStreamHandler</code> is the common
 * superclass for all stream protocol handlers. A stream protocol
 * handler knows how to make a connection for a particular protocol
 * type, such as <code>http</code>, <code>ftp</code>, or
 * <code>gopher</code>.
 * <p>
 * In most cases, an instance of a <code>URLStreamHandler</code>
 * subclass is not created directly by an application. Rather, the
 * first time a protocol name is encountered when constructing a
 * <code>URL</code>, the appropriate stream protocol handler is
 * automatically loaded.*/

Which is exactly the problem in our case. Once the URLStreamHandler is setup for the first
blockcontext as protocol the second servlet will directly use the java.net.URLStreamHandler
and use that protocol.

Meaning if you start tomcat with both apps deployed the first request of the first app decides
which blockcontext will be associate with the block context protocol

That happens in BlockContextURLStreamHandlerFactory where createURLStreamHandler is only called
once with the first request the second then uses the old block context.

                
> webapp fails if on the same servlet container is a c2.2.1 or other c3 webapp running

> -------------------------------------------------------------------------------------
>
>                 Key: COCOON3-105
>                 URL: https://issues.apache.org/jira/browse/COCOON3-105
>             Project: Cocoon 3
>          Issue Type: Bug
>          Components: cocoon-webapp
>    Affects Versions: 3.0.0-beta-1
>            Reporter: Thorsten Scherler
>            Priority: Blocker
>
> 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 org.apache.cocoon.sitemap.SitemapBuilder.build(SitemapBuilder.java:70) ~[cocoon-sitemap-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
> 	at org.apache.cocoon.servlet.RequestProcessor.initializeSitemap(RequestProcessor.java:203)
~[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.getConnection(BlockContextURLConnection.java:76)
~[cocoon-block-deployment-1.2.1.jar:1.2.1]
> 	at org.apache.cocoon.blockdeployment.BlockContextURLConnection.getInputStream(BlockContextURLConnection.java:56)
~[cocoon-block-deployment-1.2.1.jar:1.2.1]
> 	at java.net.URL.openStream(URL.java:1010) ~[na:1.6.0_30]
> 	at org.apache.cocoon.sitemap.SitemapBuilder.build(SitemapBuilder.java:65) ~[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  http://cocoon.apache.org/2.2/1159_1_1.html
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.BlockDeploymentServletContextListener</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.

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