What are some examples of logging in Java?

What are some examples of logging in Java?

In Java, you can use the java.util.logging package or popular libraries like Log4j and SLF4J. Would you like examples using a specific library?

Can you show me an example using Log4j?

Sure! Here's a simple example:

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class LoggingExample {
    private static final Logger logger = LogManager.getLogger(LoggingExample.class);

    public static void main(String[] args) {
        logger.info("This is an info message.");
        logger.error("This is an error message.");
    }
}

This code initializes a logger and logs an info and an error message.

What configuration do I need for Log4j?

You need a log4j2.xml or log4j2.properties file in your classpath. Here's a simple log4j2.xml example:

<Configuration>
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1} - %m%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>