What are some examples of structured logging in Java?

What are some examples of structured logging in Java?

Structured logging in Java involves logging data in a structured format, often using JSON. For example, using SLF4J with Logback, you can log messages like this:

logger.info("User logged in", "userId", userId);

This logs the message along with the userId in a structured way.

Can you show me a more complex example?

Sure! Here's a more complex example using a custom object:

public class User {
    private String id;
    private String name;
    // getters and setters
}

User user = new User("123", "John Doe");
logger.info("User details", "user", user);

This logs the entire user object in a structured format.

What libraries can I use for structured logging?

You can use libraries like Logback, Log4j2, or SLF4J. They all support structured logging and can format logs in JSON.