I completely agree with you (and yes, there will be an slf4j error if there is no logging framework in the classpath). However, my user(s) have different opinion about this issue, so I think my current solution is OK. On the other hand, I still wonder what is the rational behind the DEBUG as default in logback. It seems to me that other frameworks such as log4j or java.util.logging have different behavior. Jeff Jensen-2 wrote:
I think you are trying to solve a problem that is not yours to solve. The consumers of your library are to solve that by properly configuring their logging system of choice.
Your library should have no logging implementation configured (e.g. Logback). If I use your library and have no logging framework configured, slf4j will error and no logging will occur. If that is not true with your library, then you have a library logging bug. You must not configure Logback for your library because consumers of your library may choose a different one (or a different version).
On Thu, Apr 28, 2011 at 8:08 AM, lilyevsky <lilyevsky@mooncapital.com> wrote:
Thanks Jeff,
I know how to make it find the configuration in various ways, this is not a problem. My problem is different: how to make my code behave in a sensible way when it is not under my control.
Here is the scenario. I write some library that will be used by others, I use slf4j for my logging, and I have debug output in many places. I would have more control on the library if I produced it as a jar (ideally built by maven), but unfortunately in current situation it may be used on the source code level. I mean, the other developer will compile it together with the other stuff, using naked javac.
After that, at runtime, if the configuration is not provided, the debug problem comes up.
As I mentioned, I have the solution (default configuration with WARN level is hard-coded), but I don't quite like it because now my code suddenly is aware of logback, instead of just pure slf4j.
Basically, my complaint is this: why by default logback goes to DEBUG level, not to INFO or even WARN?
At least, this could be controlled by a Java system property.
Jeff Jensen-2 wrote:
Place a Logback XML config file on the classpath. I've done this in many apps without a problem. You must've done this and it's not found (is that what you mean by "cannot find configuration file anywhere")?
On Thu, Apr 28, 2011 at 7:29 AM, Leonid Ilyevsky <lilyevsky@mooncapital.com> wrote:
When logback cannot find configuration file anywhere, it sets the default to send everything to standard output and the level is set to DEBUG.
This creates a big problem in our production environment: super-verbose log that is even difficult to look at.
My solution was to create a small wrapper using JoranConfigurator. This works great, and I can do whatever I need.
However, here is the downside: my code is no longer ignorant of logback. Previously it was purely slf4j everywhere, but now every class is indirectly dependent on logback stuff (though it is limited to 2 lines in every java file). This defeats the purpose of slf4j as pure facade.
Is there any better solution?
Our problem is, we need to guarantee that no matter what happens in the logging layer, it should never go wild and produce all that debugging noise.
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