12.7. Logging Configuration

Hazelcast has a flexible logging configuration and doesn't depend on any logging framework except JDK logging. It has in-built adaptors for a number of logging frameworks and also supports custom loggers by providing logging interfaces.

To use built-in adaptors you should set hazelcast.logging.type property to one of predefined types below.

You can set hazelcast.logging.type through configuration xml, configuration API or JVM system property.

To use custom logging feature you should implement com.hazelcast.logging.LoggerFactory and com.hazelcast.logging.ILogger interfaces and set system property hazelcast.logging.class to your custom LoggerFactory class name.

java -Dhazelcast.logging.class=foo.bar.MyLoggingFactory

You can also listen to logging events generated by Hazelcast runtime by registering LogListeners toLoggingService.

LogListener listener = new LogListener() {
    public void log(LogEvent logEvent) {
        // do something
LoggingService loggingService = Hazelcast.getLoggingService();
loggingService.addLogListener(Level.INFO, listener):

Through the LoggingService you can get the current used ILogger implementation and log your own messages too.