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Wrap Log4j 1.x MDC.put values in String.valueOf(...)

Recipe IDorg.openrewrite.java.logging.slf4j.WrapLog4j1MdcPutValueInStringValueOf
Artifactorg.openrewrite.recipe:rewrite-logging-frameworks

SLF4J MDC.put(String, String) requires a String value, but Log4j 1.x MDC.put(String, Object) accepts any object. Wrap non-String values in String.valueOf(...), skipping values already typed String, null literals, and existing String.valueOf(...) calls. Does not change the org.apache.log4j.MDC type; compose with a ChangeType to complete the migration to org.slf4j.MDC.

Single recipeslf4jlogginglog4jMSAL

Usage

This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.

mod run . --recipe org.openrewrite.java.logging.slf4j.WrapLog4j1MdcPutValueInStringValueOf

If the recipe isn’t available locally, install it with:

mod config recipes jar install org.openrewrite.recipe:rewrite-logging-frameworks:3.31.0

Data tables

Structured output this recipe can produce.

  • Source files that had resultsSource files that were modified by the recipe run.org.openrewrite.table.SourcesFileResults
  • Source files that had search resultsSearch results that were found during the recipe run.org.openrewrite.table.SearchResults
  • Source files that errored on a recipeThe details of all errors produced by a recipe run.org.openrewrite.table.SourcesFileErrors
  • Recipe performanceStatistics used in analyzing the performance of recipes.org.openrewrite.table.RecipeRunStats