Skip to main content

Remove unused dependencies

org.openrewrite.java.dependencies.RemoveUnusedDependencies

Scans through source code collecting references to types and methods, removing any dependencies that are not used from Maven or Gradle build files. This is a complex recipe which has not yet been well tested and exercised. For now it should be treated as making recommendations to further investigate.

Recipe source​

This recipe is only available to users of Moderne.

This recipe is available under the Moderne Proprietary License.

Examples​

Example 1​
Unchanged​
import java.util.List;
import java.util.ArrayList;
public class A {
    List<String> a = new ArrayList<>();
}
Unchanged​
project
Before​
pom.xml
<project>
    <groupId>com.mycompany</groupId>
    <artifactId>app</artifactId>
    <version>1</version>
    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>29.0-jre</version>
        </dependency>
    </dependencies>
</project>
After​
pom.xml
<project>
    <groupId>com.mycompany</groupId>
    <artifactId>app</artifactId>
    <version>1</version>
</project>
Example 2​
Unchanged​
import com.google.common.collect.Lists;
import java.util.List;
public class A {
    List<String> a = Lists.newArrayList();
}
Unchanged​
import java.util.List;
import java.util.ArrayList;
public class B {
    List<String> b = new ArrayList<>();
}
Unchanged​
no-guava
Unchanged​
root
Unchanged​
uses-guava
Unchanged​
pom.xml
<project>
      <groupId>com.mycompany</groupId>
      <artifactId>root</artifactId>
      <version>1</version>
      <modules>
          <module>uses-guava</module>
          <module>no-guava</module>
      </modules>
</project>
Before​
pom.xml
<project>
    <groupId>com.mycompany</groupId>
    <artifactId>no-guava</artifactId>
    <version>1</version>
    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>29.0-jre</version>
        </dependency>
    </dependencies>
</project>
After​
pom.xml
<project>
    <groupId>com.mycompany</groupId>
    <artifactId>no-guava</artifactId>
    <version>1</version>
</project>
Unchanged​
pom.xml
<project>
    <groupId>com.mycompany</groupId>
    <artifactId>uses-guava</artifactId>
    <version>1</version>
    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>29.0-jre</version>
        </dependency>
    </dependencies>
</project>
Example 3​
Before​
build.gradle
plugins {
    id 'java'
}
repositories {
    mavenCentral()
}
dependencies {
    implementation 'com.google.guava:guava:29.0-jre'
}
After​
build.gradle
plugins {
    id 'java'
}
repositories {
    mavenCentral()
}
dependencies {
}
Unchanged​
import java.util.List;
import java.util.ArrayList;
public class A {
    List<String> a = new ArrayList<>();
}
Unchanged​
project
Example 4​
Unchanged​
build.gradle
plugins {
    id 'java'
}
repositories {
    mavenCentral()
}
dependencies {
    implementation 'com.google.guava:guava:29.0-jre'
}
Unchanged​
import com.google.common.collect.Lists;
import java.util.List;
public class A {
    List<String> a = Lists.newArrayList();
}
Unchanged​
project

Usage​

This recipe has no required configuration options. Users of Moderne can run it via the 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 RemoveUnusedDependencies

If the recipe is not available locally, then you can install it using:

mod config recipes jar install org.openrewrite.recipe:rewrite-java-security:3.13.0

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.