[JAVA] I want to change the log output settings of UtilLoggingJdbcLogger

1. Use java.util.logging.config.file

Doma2 uses the JDBCLogger interface for log output, and UtilLoggingJdbcLogger is provided as an example of its implementation. Since this UtilLoggingJdbcLogger adopts JUL (java.util.logging) for log output, the system property java.util.logging.config.file can be used for the settings related to log output.


handlers= java.util.logging.ConsoleHandler, java.util.logging.FileHandler

java.util.logging.FileHandler.level = INFO
java.util.logging.FileHandler.pattern = logging_by_propertiesfile.log
java.util.logging.FileHandler.formatter = java.util.logging.SimpleFormatter

java.util.logging.ConsoleHandler.level = INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

For example, if you have the above logging.properties and want to set it to UtilLoggingJdbcLogger, you can do it with -Djava.util.logging.config.file = \ path \ to \ logging.properties. is.

2. Use java.util.logging.config.file

You can also extend UtilLoggingJdbcLogger yourself without using the system properties file.

First, create a class that inherits UtilLoggingJdbcLogger. At this time, set the log output for super.logger (instance of JUL).


public class MyUtilLoggingJdbcLogger extends UtilLoggingJdbcLogger {
    public MyUtilLoggingJdbcLogger() {
        try {
            Formatter formatter = new SimpleFormatter();

            Handler consoleHandler = new ConsoleHandler();

            Handler fileHandler = new FileHandler("logging_by_class.log");

        } catch (SecurityException | IOException e) {

After that, set to use the MyUtilLoggingJdbcLogger created in the Config class of Doma2. Specifically, just override the getJdbcLogger method and return the MyUtilLoggingJdbcLogger instance.


public class AppConfig implements Config {
    private final JdbcLogger logger;

    private AppConfig() {
        logger = new MyUtilLoggingJdbcLogger();

    public JdbcLogger getJdbcLogger() {
        return logger;

Environmental information

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