Remove unused imports

org.openrewrite.java.RemoveUnusedImports

Remove imports for types that are not referenced. As a precaution against incorrect changes no imports will be removed from any source where unknown types are referenced. The most common cause of unknown types is the use of annotation processors not supported by OpenRewrite, such as lombok.

Tags

• RSPEC-1128

Recipe source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite

• artifactId: rewrite-java

• version: 8.23.1

Usage

This recipe has no required configuration parameters and comes from a rewrite core library. It can be activated directly without adding any dependencies.

Gradle

1. Add the following to your build.gradle file:

build.gradle

plugins {
    id("org.openrewrite.rewrite") version("6.11.2")
}

rewrite {
    activeRecipe("org.openrewrite.java.RemoveUnusedImports")
}

repositories {
    mavenCentral()
}

2. Run gradle rewriteRun to run the recipe.

Gradle init script

1. Create a file named init.gradle in the root of your project.

init.gradle

initscript {
    repositories {
        maven { url "https://plugins.gradle.org/m2" }
    }
    dependencies { classpath("org.openrewrite:plugin:latest.release") }
}
rootProject {
    plugins.apply(org.openrewrite.gradle.RewritePlugin)
    dependencies {
        rewrite("org.openrewrite:rewrite-java")
    }
    rewrite {
        activeRecipe("org.openrewrite.java.RemoveUnusedImports")
    }
    afterEvaluate {
        if (repositories.isEmpty()) {
            repositories {
                mavenCentral()
            }
        }
    }
}

2. Run gradle --init-script init.gradle rewriteRun to run the recipe.

Maven POM

1. Add the following to your pom.xml file:

pom.xml

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.27.0</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.java.RemoveUnusedImports</recipe>
          </activeRecipes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

2. Run mvn rewrite:run to run the recipe.

Maven Command Line

You will need to have Maven installed on your machine before you can run the following command.

shell

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run -Drewrite.activeRecipes=org.openrewrite.java.RemoveUnusedImports

Moderne CLI

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell

mod run . --recipe RemoveUnusedImports

See how this recipe works across multiple open-source repositories

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.

Contributors

Jonathan Schneider, Tim te Beek, Thomas Zub, tclayton-newr, Greg Adams, traceyyoshima, Knut Wannheden, Patrick Way, Tyler Van Gorder, Scott Jungling, Sam Snyder, Aaron Gershman