Hi Dan, Thank you for your detailed message. Answers in-line.
On 09.05.2013 19:26, [email protected] wrote:
Hi, Thank you for logback and slf4j. We have found them very useful. I would like to inquire about debugging output, starting with the intended behavior of the system property logback.debug. It appears to have no effect if an application is configured via Groovy. Setting logback.statusListenerClass does have some effect, though the output is not as verbose as with XML configuration. I created a sample project that demonstrates the differences: https://github.com/dstine/logback-debug-groovy. My experiments use the latest released version of logback 1.0.12.
Thank you for going to the trouble of creating this sample project.
My first question is, should logback.debug behave the same for both XML and Groovy configuration? If yes, my next question is, how would we fix this? I see the following code in ConfigurationAction (XML):
Yes, logback.debug should have the same affect in both config systems.
https://github.com/qos-ch/logback/blob/71886409e62533af0bdf1d922a7d66f3818d42db/logback-classic/src/main/java/ch/qos/logback/classic/joran/action/ConfigurationAction.java#L47-L52
It looks like logback.debug is simply a shortcut for adding the status listener. Is that correct, or is there anything else at play? Should we "just" copy this code to ConfigurationDelegate (Groovy), or centralize it somehow?
Yes, that is correct. The debug attribute is a shortcut for adding the OnConsoleStatusListener. Nothing else is at play. Copying to ConfigurationDelegate sounds good.
Next, the output for Groovy config appears to not include information about configuring loggers, whereas XML config provides this output: 11:43:58,046 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 11:43:58,078 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG 11:43:58,078 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
Information about setting logger levels is obviously beneficial. I am surprised to learn that it's missing in Gaffer (the groovy configurator).
Last, are there other differences I have not yet noticed?
There is no strict rule mandating that Joran's (the XML configurator) output match that of Gaffer (the groovy configurator) or vice versa. If you think useful information is missing or there is too much information output by either configurator, do not hesitate to make corrections. From what I can see you are already familiar with git. A pull request would be the easiest way to send in your fixes.
Thanks, Dan
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