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JabRef uses the logging facade SLF4j. All log messages are passed internally to tinylog which handles any filtering, formatting and writing of log messages.

  • Obtaining a logger for a class:

      private static final Logger LOGGER = LoggerFactory.getLogger(<ClassName>.class);
  • If the logging event is caused by an exception, please add the exception to the log message as:

        catch (SomeException e) {
           LOGGER.warn("Warning text.", e);
  • SLF4J also support parameterized logging, e.g. if you want to print out multiple arguments in a log statement use a pair of curly braces. Examples
  • When running tests, is used. It is located under src/test/resources. As default, only info is logged. When developing, it makes sense to use debug as log level. One can change the log level per class using the pattern level@class=debug is set to debug. In the .properties file, this is done for org.jabref.model.entry.BibEntry.