Suggestions for changing logging levels?

I'm looking at using the JDK 1.4 Logging API in my web application. I want the ability to selectively change the logging level for my application component loggers (not the global logging level) without recompiling and redeploying my code. I can live with having to restart my web container.
As I understand the documentation, the API provides 3 options for customizing logging properties:
1) Modifying the default logging.properties file in the JRE lib folder, which is not workable for a application component for a number of reasons.
2) Specifying an alternative properties file when the JVM is started, which is not workable because my web app doesn't start the container.
3) Specifying a class that acts as the property file loader, again not workable because my web app is only one of many running in my container.
Additionally, the API docs are not clear on the effect of calling the LogManager method readConfiguration(InputStream ins) with just my properties at some point in my application.
Does anyone know a reasonable way of controlling logging levels in this fashion?

Use log4j, and put the log4j.properties in the <webapp>/WEB-INF/classes directory.
To use log4j, simply put log4j-x.x.x.jar into your <webapp/WEB-INF/lib directory. The java logging setup will automatically use it.

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