Message formatted twice.

[thorin0]

Test code:

import mu.KotlinLogging

private val logger = KotlinLogging.logger {}

fun main() {
    logger.info("Message: {}", "String with {} curly braces")
}

Expected output:

Message: String with {} curly braces

Actual output:

Message: String with String with {} curly braces curly braces

[oshai]

Thanks for reporting!
Can you please share more details: the version used, is it JVM/JS and do you use underlying framework for logging?
Ideally, a repo with reproduction will be best.

[thorin0]

It is JVM version with logback backend.

        <dependency>
            <groupId>io.github.microutils</groupId>
            <artifactId>kotlin-logging</artifactId>
            <version>1.8.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.9</version>
        </dependency>

For the first time, the message format is applied here:
https://github.com/MicroUtils/kotlin-logging/blob/d51e8683840cfc69a18636a9b774c7c88c242b64/src/jvmMain/kotlin/mu/internal/LocationAwareKLogger.kt#L200
For the second time, the message format is applied here:
https://github.com/qos-ch/logback/blob/bbc783e6d68482abe8e7dff0d06708175e971b91/logback-classic/src/main/java/ch/qos/logback/classic/spi/LoggingEvent.java#L314

[oshai]

Thanks for the details! I managed to reproduce it in a test, and going to create a fix for it soon.