Cocoon 2.2 is using commons-logging, so in the environment shown by your
stack trace it would also be going to SLF4J and the SimpleLogger via the
jcl adapter.
I guess it would help to know what version of SLF4J is in use and where
its jars are in the various places they could be.
Ralph Goers wrote:
Cocoon does not directly use Log4j. It uses an abstraction layer that
defaults to log4j. slf4j is also an abstraction layer. In the stack
trace you have shown below it is using its SimpleLogger
implementation. This can be replaced with Logback, Log4j or
java.util.logging. You might simply try replacing slf4j-simple.jar
with slf4j-log4j12.jar.
Another alternative is that Spring actually wants to use
commons-logging. Somehow that has been replaced with SLF4J's
comons-logging compatible implementation. If you just remove
jcl-over-slf4j.jar and replace it with commons-logging.jar this should
also remove slf4j.
Ralph//
David Legg wrote:
I'm trying to add a new block to a Cocoon web app and every time I
try to do a 'mvn jetty:run' command I get a
'java.lang.AbstractMethodError' and the web app just seems to stop
serving web pages (error list shown at end of this message).
The block in question makes calls to the Sesame [1] RDF triplestore.
The important thing is that, like a lot of modern Java apps, Sesame
makes use of SLF4J [2] to do its logging. I'm not familiar with the
various logging frameworks but I think I've accidently walked into a
minefield here! Cocoon seems to use Log4j, Jetty might be using
something else and my block might need slf4j. Add to this that I've
seen a report about slf4j not playing well with the Reloading Class
Loader (RCL) and I think I'm well and truly stuffed!
Please, if anyone knows how to get a library that uses slf4j to play
nicely in a Cocoon environment I'd be very grateful ;-)
Regards,
David Legg
Errors...
...
[INFO] [jetty:run]
[INFO] Configuring Jetty for project: meerkat-browser
...
2008-07-15 16:57:35.032::INFO: Logging to STDERR via
org.mortbay.log.StdErrLog
[INFO] Starting jetty 6.1.7 ...
2008-07-15 16:57:35.112::INFO: jetty-6.1.7
...
2008-07-15 16:57:36.964::WARN: failed
[EMAIL PROTECTED]/,D:\projects\meerkat\meerkat-browser\target\rcl\webapp}
java.lang.AbstractMethodError:
org.slf4j.impl.SimpleLogger.trace(Ljava/lang/String;)V
at
org.apache.commons.logging.impl.SLF4JLog.trace(SLF4JLog.java:82)
at
org.springframework.core.CollectionFactory.createConcurrentMapIfPossible(CollectionFactory.java:195)
...
[1] http://www.openrdf.org/
[2] http://www.slf4j.org/
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