Since version 0.3 OpenMarkov implements the log of Apache log4j.

All information written to the log is meant for the developer so it should be in English.

Every information that a java class generates and the developer deems as valuable (debugging, execution time) should be written to that log.

Log priority levels

Every log has some levels to mark the importance of the information, in log4j they are (extracted from the Level.class):

    /** A severe error that will prevent the application from continuing. */
    public static final Level FATAL;

    /** An error in the application, possibly recoverable. */
    public static final Level ERROR;

    /** An event that might possible lead to an error. */
    public static final Level WARN;

    /** An event for informational purposes. */
    public static final Level INFO;

    /** A general debugging event. */
    public static final Level DEBUG;

    /** A fine-grained debug message, typically capturing the flow through the application. */
    public static final Level TRACE;

Adding a log to a class

To add a log create a Logger object and initialize it with:
LogManager.getLogger(<yourClassName>.class.getName());

Submit info to a log

To add info to the log, call the method of the level you want use: logger.warn(<String>);

For logging errors: logger.error("The potential can't be converted to table", exceptionObject); Will print first the message, then the exception with its traceback.

Finally, the log is written in the folder that contains OpenMarkov per session, overwriting the previous log.