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From "Yoav Shapira" <yo...@apache.org>
Subject Re: URLStreamHandler and ContentHandler
Date Wed, 24 May 2006 13:08:03 GMT
Hi,
Mmm, I'd hate having endorsed classes depend on commons-logging ;(  I
haven't tried it myself, nor attempted to reproduce your scenario, so
this is just shooting from the hip: what happens if you don't depend
on commons-logging?

Yoav


On 5/24/06, Javier Iglesias <Javier.Iglesias@unil.ch> wrote:
> Hi there!
>
> I'm working on a framework that uses its own URL scheme
> ("protocol": oan://host/file...) by extension of
> java.net.URLStreamHandler. It also uses its own content
> handlers by extension of java.net.ContentHandler.
>
> Using Sun's default resolution mechanisms, their respective
> packages are appended to the "java.protocol.handler.pkgs" and
> "java.content.handler.pkgs" System properties.
>
> Everything works fine, until I try to use my protocol and
> content handlers in a webapp deployed on Tomcat 5.5.17/MacOSX...
>
>
>
> [1] From what I could gather from the documentation and forums,
>      the jars containing my classes should be placed in
>      $CATALINA_HOME/common/endorsed/. Is it correct?
>
> Indeed, they are not considered by Tomcat's class loader if they
> are copied to $CATALINA_HOME/mywebapp/WEB-INF/lib/. I tried
> $CATALINA_HOME/common/lib/ too, without success.
>
>
>
> [2] Apparently, all the dependencies (.jars) required by my
> handlers jars should also be placed in $CATALINA_HOME/common/endorsed/
> or the classes cannot be instantiated by mines. Still correct?
>
>
>
> [3] One of those dependencies itself depends on
>      apache-commons-logging.jar.
>
> [3a] If I put this jar in $CATALINA_HOME/common/endorsed/, Tomcat
>       refuses to launch. Does it happen due to a collision with
>       $CATALINA_HOME/bin/commons-logging-api.jar?
>
> -------------------------------------------------------------------------------------
> Exception in thread "main" java.lang.ExceptionInInitializerError
> Caused by: org.apache.commons.logging.LogConfigurationException:
> org.apache.commons.logging.LogConfigurationException:
> java.lang.NullPointerException (Caused by java.lang.NullPointerException))
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
>      at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
>      at org.apache.catalina.startup.Bootstrap.<clinit>(Bootstrap.java:53)
> Caused by: org.apache.commons.logging.LogConfigurationException:
> java.lang.NullPointerException (Caused by java.lang.NullPointerEx
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
>      ... 4 more
> Caused by: java.lang.NullPointerException
>      at
> org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:374)
>      ... 5 more
> -------------------------------------------------------------------------------------
>
>
>
> [3b] If I remove apache-commons-logging.jar. from
>       $CATALINA_HOME/common/endorsed/, then I get a
>       NoClassDefFoundError for org.apache.commons.logging.LogFactory
>
>
>
> Using java -verbose... I could check that my classes are properly
> loaded, as well as org.apache.commons.logging.LogFactory by the System,
> but this loading fails when requested through my code's dependencies.
>
>
>
> Thanks in advance for all the wisdom you will poor into my inbox!
>
> Best wishes,
>
>    --javier
>
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>
>


-- 
Yoav Shapira
Nimalex LLC
1 Mifflin Place, Suite 310
Cambridge, MA, USA
yoavs@computer.org / www.yoavshapira.com

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