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: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> 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: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
