How do I log an exception? - Learn Java by Examples

In this example you can see how we can log an exception when it occurs. In the code below we are trying to parse an invalid date which will give us a ParseException. To log the exception we call the Logger.log() method, passes the logger Level, add some user-friendly message and the Throwable object.

package org.kodejava.util.logging;

import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.ParseException;

public class LoggingException {
    private static Logger logger =
            Logger.getLogger(LoggingException.class.getName());

    public static void main(String[] args) {
        DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
        df.setLenient(false);

        try {
            // Try to parse a wrong date.
            Date date = df.parse("12/30/1990");

            System.out.println("Date = " + date);
        } catch (ParseException e) {
            // Create a Level.SEVERE logging message
            if (logger.isLoggable(Level.SEVERE)) {
                logger.log(Level.SEVERE, "Error parsing date", e);
            }
        }
    }
}

The code above will produce the following log message.

Oct 07, 2021 8:21:44 PM org.kodejava.util.logging.LoggingException main
SEVERE: Error parsing date
java.text.ParseException: Unparseable date: "12/30/1990"
    at java.base/java.text.DateFormat.parse(DateFormat.java:399)
    at org.kodejava.util.logging.LoggingException.main(LoggingException.java:20)

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Wayan

Founder at Kode Java

A programmer, runner and recreational diver, lives on the island of Bali, Indonesia. Programming in Java, Spring Framework, Hibernate / JPA, MySQL. To support me working on this project, buy me a cup of coffee, every little bit helps. Thank you.

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