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A guide to configure your Spring Boot application to send `ERROR` level logs via email using Log4j2. Learn how to set up Log4j2 and troubleshoot common issues.
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Sending ERROR Level Logs via Email in Spring Boot Using Log4j2

In today's fast-paced development world, logging is a crucial aspect of monitoring and debugging applications. One common requirement is to receive notifications when ERROR messages are logged. This guide will guide you through configuring your Spring Boot application to send ERROR level logs via email using Log4j2.

The Challenge

Many developers struggle to properly configure Log4j2 to send emails, even after following multiple guides. This guide addresses a typical scenario where someone has set up a Spring Boot application with Log4j2 and intends to send error logs via email but encounters issues.

The Setup

Environment: You have a Docker SMTP server set up on localhost.

Dependencies:

Spring Boot with Log4j2

Spring Boot Mail

Configuration:

pom.xml: Proper dependencies for Spring Boot and Log4j2.

log4j2.xml: Configuration for the Log4j2 logging framework.

application.yml: SMTP mail server settings.

Below is a provided structure of the configuration files you'll be working with.

Example Configuration

pom.xml

Make sure you have the necessary dependencies added as follows:

[[See Video to Reveal this Text or Code Snippet]]

log4j2.xml

Here's how your Log4j2 configuration should look:

[[See Video to Reveal this Text or Code Snippet]]

application.yml

Your SMTP configuration should be as below:

[[See Video to Reveal this Text or Code Snippet]]

Troubleshooting the Configuration

Despite the configurations above, many users find that Log4j2 does not send emails. The key issues are often related to how the logger is referenced within the configuration.

In many cases, Log4j2 does not recognize the application logger unless it is explicitly declared. This is where new loggers can be defined.

Adding Necessary Loggers

You can add a specific logger related to your application like so:

[[See Video to Reveal this Text or Code Snippet]]

Testing the Setup

To ensure your setup is working properly, perform a test log inside your application:

[[See Video to Reveal this Text or Code Snippet]]

If everything is configured correctly, an email with the log message will be sent.

Conclusion

With the proper configuration and an understanding of how Log4j2 recognizes loggers, you can successfully log ERROR messages via email in your Spring Boot application. Should you face issues, revisiting your logger declarations and ensuring your SMTP settings are correct would be your first steps to troubleshooting. Happy logging!