Interesting log4j problem.

[Rahul Bhattacharjee]

Please help me in the following issue.

I have a tomcat running having three web context's in that.All the applications running in that context are using of log4j.All the applications have initialized (ie. configuration using PropertyConfigurator)the logging system individually.So when we take a instance of the Logger using

Logget myLogger = Logger.getLogger("myLogger");
Then how does log4j determines that which configuration file to follow.
As I think the implementation of LogManager should be a singleton.Then in one JVM there should be one instance of LogManager , so does it resolve this issue.

[Ben Souther]

Singletons are single to the classloader (not the JVM).
Tomcat uses separate classloaders in each context.
It also has some common classloaders for tomcat/shared/classes, tomcat/shared/lib, tomcat/common/classes, and tomcat/common/lib.

Whether or not your apps shard the same logger depends on where you place your log4j jar file.