As of Spring Boot 1.5 a new loggers actuator endpoint allows viewing and changing application logging levels in runtime.

• Add spring-boot-actuator to your project

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

• Disable security for loggers or for all endpoints

Set either management.security.enabled to false or endpoints.loggers.sensitive to false to disable security. Note that the latter changes only loggers endpoint.

• Get all loggers details

Execute /loggers endpoint in the browser or with curl. You will get a detailed view of the loggers configuration, e.g (fragment):

{
 "levels": [
 "OFF",
 "ERROR",
 "WARN",
 "INFO",
 "DEBUG",
 "TRACE"
 ],
 "loggers": {
 "ROOT": {
 "configuredLevel": "TRACE",
 "effectiveLevel": "TRACE"
 },
 "org": {
 "configuredLevel": null,
 "effectiveLevel": "TRACE"
 },
 "pl.codeleak.demos.sbt": {
 "configuredLevel": null,
 "effectiveLevel": "TRACE"
 },
 "pl.codeleak.demos.sbt.Application": {
 "configuredLevel": null,
 "effectiveLevel": "TRACE"
 }
 }
}

• Get selected logger details

Use the following endpoint to get details of a selected logger:

/logger/{logger}

Examples:

λ curl -i http://localhost:8080/loggers/ROOT

{
"configuredLevel": null,
"effectiveLevel": "TRACE"
}

λ curl -i http://localhost:8080/loggers/pl.codeleak.demos

{
"configuredLevel": null,
"effectiveLevel": "TRACE"
}

1. Update selected logger level in runtime

Execute a POST request:

curl -i -X POST -H 'Content-Type: application/json' -d '{"configuredLevel": "TRACE"}' http://localhost:8080/loggers/ROOT

Source code

The example configuration can be found in https://github.com/kolorobot/spring-boot-thymeleaf repository.