Re: More on logging

Thursday, April 21, 2011, 7:01:40 PM, Chris wrote:

> We're trying to use SLF4j with Freemarker 2.3.16 and we're having a bit
> of trouble. I keep getting:
>
> log4j:WARN No appenders could be found for logger (freemarker.runtime).

(I have no experience with this error...)

> This is bizarre, because so far as I can tell, log4j isn't on the 
> classpath. We do have log4j-over-slf4j on the classpath, so maybe that's
> where it's coming from.

Exactly. After all the point of that jar is to mimic the presence of
Log4J.

> Logger.selectLoggerLibrary(Logger.LIBRARY_NONE) 
> seems to fix it, at least for now.
>
> In any case, I saw a thread on this list, July 25, 2010, that
> Logger.selectLoggerLibrary() would support slf4j in 2.3.17. That's
> cool, that will probably do the job.

If you are allowed to use a nightly releases, just use that:
http://freemarker.org:8085/download/FM-BRANCH23/artifacts/build-202/Library/freemarker.jar
I'm 99% that it's as stable as 2.3.16. Then use:

  Logger.selectLoggerLibrary(Logger.LIBRARY_SLF4J);

2.3.17 will be out in a few weeks, no mater how few new features it
will it contain.

> In the meantime, though, I'd like to urge you NOT to add
> commons-logging as an option to 2.3.17. Commons logging has enormous
> problems (which have been widely reported; a little googling will
> find them), and it's continuing headache to exclude commons logging
> from projects that are based on Maven. If you add a Maven dependency
> on commons logging to your POM, lots of people will have to do
> backflips to get rid of it. (For more on the problem, google
> "version 99 does not exist"). Just a suggestion.

FreeMarker 2.3 surely doesn't add *any* logging library as dependency
(except for building the freemarker.jar itself). In fact FreeMarker
has 0 required dependencies. Is it still a problem if FreeMarker
supports Commons Logging?

> Thanks. Looking forward to 2.3.17.

-- 
Best regards,
 Daniel Dekany


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