Jonas 2.4.4 and log4j 1.2beta incompatibility

[Wi...@alltel.com]

We downloaded the latest version of Jonas 2.4.4 that uses log4j v1.0.4
set of API's.

We are using the log4j 1.2 beta exclusively and when I put the log4j 1.2
beta jar file in front of the class path, Jonas throws a
java.lang.NoSuchMethodError at
org.objectweb.monolog.wrapper.log4j.MonologCategory.getInstance(MonologC
ategory.java:25).

Turns out that the method
  Category getInstance(String name, CategoryFactory factory)
that the Jonas log4j wrapper uses has been deprecated in the beta
version of log4j.

I guess I can decompile all of the Jonas's log4j wrapper classes and
rewrite but that sounds a bit extreme for such a global problem.

I thought that log4j beta was supposed to be backwards compatible.

Has anyone else experienced this or have a solution to the problem?

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Re: Jonas 2.4.4 and log4j 1.2beta incompatibility

[Ray Thomas <rt...@liveintellect.org>]

The new version of the Servlet spec provides for Classloader
differentiation between versioned jars (as a result of similar conflicts
between the XML parser included in most servlet engines and different
parsers included in web applications.) See the "Rules for class loading"
section of
http://developer.java.sun.com/developer/technicalArticles/Servlets/servl
etapi2.3/

The Jonas team might need to consider adding similar infrastructure to
their server so you might want to drop a note in their suggestion box.

In the meantime, you might be able to write and register a custom
ClassLoader in your app that accomplishes the same sort of class
namespace partitioning.  See an article on writing custom classloaders
at http://www.javaworld.com/javaworld/jw-03-2000/jw-03-classload.html

-R
----- Original Message -----
From: <Wi...@alltel.com>
To: <lo...@jakarta.apache.org>
Sent: Monday, April 01, 2002 2:15 PM
Subject: Jonas 2.4.4 and log4j 1.2beta incompatibility


> We downloaded the latest version of Jonas 2.4.4 that uses log4j v1.0.4
> set of API's.
>
> We are using the log4j 1.2 beta exclusively and when I put the log4j
1.2
> beta jar file in front of the class path, Jonas throws a
> java.lang.NoSuchMethodError at
>
org.objectweb.monolog.wrapper.log4j.MonologCategory.getInstance(MonologC
> ategory.java:25).
>
> Turns out that the method
>   Category getInstance(String name, CategoryFactory factory)
> that the Jonas log4j wrapper uses has been deprecated in the beta
> version of log4j.
>
> I guess I can decompile all of the Jonas's log4j wrapper classes and
> rewrite but that sounds a bit extreme for such a global problem.
>
> I thought that log4j beta was supposed to be backwards compatible.
>
> Has anyone else experienced this or have a solution to the problem?
>
> --
> To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
> For additional commands, e-mail:
<ma...@jakarta.apache.org>
>
>


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