How do I handle logging exceptions in Java?

How do I handle logging exceptions in Java?

In Java, you can handle logging exceptions using the java.util.logging package or popular libraries like Log4j or SLF4J. Would you like an example?

Yes, please provide an example using Log4j.

Sure! First, ensure you have Log4j in your project. Then, you can set up a logger like this:

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

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

    public void myMethod() {
        try {
            // code that may throw an exception
        } catch (Exception e) {
            logger.error("An error occurred: ", e);
        }
    }
}

What if I want to log different levels of messages?

You can log messages at different levels using methods like logger.info(), logger.warn(), logger.error(), etc. For example:

logger.info("This is an info message");
logger.warn("This is a warning message");
logger.error("This is an error message");

How can I configure the logging level in Log4j?

You can configure the logging level in the log4j2.xml configuration file. For example:

<Configuration>
    <Loggers>
        <Logger name="com.example" level="debug" />
        <Root level="error">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>