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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
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>
Unchanged
import java.util.List;
import java.util.ArrayList;
public class A {
List<String> a = new ArrayList<>();
}
Unchanged
project

Example 2
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>
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>
Unchanged
import com.google.common.collect.Lists;
import java.util.List;
public class A {
List<String> a = Lists.newArrayList();
}
Unchanged
uses-guava
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
import java.util.List;
import java.util.ArrayList;
public class B {
List<String> b = new ArrayList<>();
}
Unchanged
no-guava
Unchanged
root

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:3.7.0

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.