Skip to main content

Change SLF4J log level

org.openrewrite.java.logging.slf4j.ChangeLogLevel

Change the log level of SLF4J log statements.

Recipe source​

GitHub, Issue Tracker, Maven Central

This recipe is available under the Moderne Source Available License.

Options​

TypeNameDescriptionExample
LevelfromThe log level to change from.INFO
LeveltoThe log level to change to.DEBUG
StringstartsWithOptional. Only change log statements that start with this string. When omitted all log statements of the specified level are changed.LaunchDarkly

Example​

Parameters​
ParameterValue
fromChangeLogLevel.Level.INFO
toChangeLogLevel.Level.DEBUG
startsWithLaunchDarkly
Before​
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class Test {
    private static final Logger log = LoggerFactory.getLogger(Test.class);

    void test() {
        log.info("LaunchDarkly Hello");
    }
}
After​
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class Test {
    private static final Logger log = LoggerFactory.getLogger(Test.class);

    void test() {
        log.debug("LaunchDarkly Hello");
    }
}

Usage​

This recipe has required configuration parameters. Recipes with required configuration parameters cannot be activated directly (unless you are running them via the Moderne CLI). To activate this recipe you must create a new recipe which fills in the required parameters. In your rewrite.yml create a new recipe with a unique name. For example: com.yourorg.ChangeLogLevelExample. Here's how you can define and customize such a recipe within your rewrite.yml:

rewrite.yml
---
type: specs.openrewrite.org/v1beta/recipe
name: com.yourorg.ChangeLogLevelExample
displayName: Change SLF4J log level example
recipeList:
  - org.openrewrite.java.logging.slf4j.ChangeLogLevel:
      from: INFO
      to: DEBUG
      startsWith: LaunchDarkly

Now that com.yourorg.ChangeLogLevelExample has been defined, activate it and take a dependency on org.openrewrite.recipe:rewrite-logging-frameworks:3.7.0 in your build file:

  1. Add the following to your build.gradle file:
build.gradle
plugins {
    id("org.openrewrite.rewrite") version("7.5.0")
}

rewrite {
    activeRecipe("com.yourorg.ChangeLogLevelExample")
    setExportDatatables(true)
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-logging-frameworks:3.7.0")
}
  1. Run gradle rewriteRun to run the recipe.

See how this recipe works across multiple open-source repositories​

Run this recipe on OSS repos at scale with the Moderne SaaS.

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Data Tables​

Source files that had results​

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column NameDescription
Source path before the runThe source path of the file before the run. null when a source file was created during the run.
Source path after the runA recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changesIn a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changesThe specific recipe that made a change.
Estimated time savingAn estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
CycleThe recipe cycle in which the change was made.

Contributors​

Sam Snyder, Jonathan Schnéider, Wojtek