On 23/10/2016 18:24, minglei yin wrote:
> Hi all,
>
> Recently, I want to implement a log functionality which is very similar to
> log mechanism in Tomcat. So I am here to ask some helps.
>
> I just want to know, how Tomcat implements that different web applications
> can have different logging configurations and you do not need to worry
> about them interfering with each other. As I found some info by google
> before, Tomcat uses its own custom ClassLoaderLogManager which is
> classloader-aware. And I know this. But through my own experiment that I
> changed the ClassLoaderLogManager.java and replaced the tomcat-juli.jar, I
> found that when I called logger.info(""), it seemed that the introduced log
> interface in my web-app did not have a interaction with
> ClassLoaderLogManager. So I really just do not know how Tomcat gets this
> done.
There are multiple components to this:
- The custom LogManager that maintains a separate set of loggers
for each class loader
- Configuring Tomcat to use this in the start-up scripts
- Ensuring that the Thread context class loader is set before obtaining
a logger.
> Really thank you guys for any suggestions and advice.
You can learn a lot by configuring Tomcat for remote debugging and
stepping your way through the relevant code with your favourite IDE.
Mark
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