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Remove unused dependencies

Recipe IDorg.openrewrite.java.dependencies.RemoveUnusedDependencies

Artifactorg.openrewrite.recipe:rewrite-java-security

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 best effort and not guaranteed to work well in all cases; false positives are still possible. This recipe takes reflective access into account: - When reflective access to a class is made unambiguously via a string literal, such as: Class.forName("java.util.List") that is counted correctly. - When reflective access to a class is made ambiguously via anything other than a string literal no dependencies will be removed. This recipe takes transitive dependencies into account: - When a direct dependency is not used but a transitive dependency it brings in is in use the direct dependency is not removed.

Single recipeJavaModerne Proprietary License

Try in PlatformTry this recipe in the Moderne platform. Not a user yet? You’ll get a no-setup demo environment, with nothing to install or configure.

Options

1 parameters

1 optional

Parameter	Example	Type	Required
ignoredDependencies	org.projectlombok:lombok,com.google.*:*	List	Optional
A list of groupId:artifactId glob patterns for dependencies that should never be removed, even if they appear unused. For example, com.google.*:* would ignore all Google dependencies, and *:lombok would ignore Lombok regardless of group ID.

Examples

xml

Parameter	Value
ignoredDependencies	List.of()

Unchanged

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

xml

Before

<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

<project>
    <groupId>com.mycompany</groupId>
    <artifactId>app</artifactId>
    <version>1</version>
</project>

Diff

--- pom.xml
+++ pom.xml
@@ -5,7 +5,0 @@
    <artifactId>app</artifactId>
    <version>1</version>
-   <dependencies>
-       <dependency>
-           <groupId>com.google.guava</groupId>
-           <artifactId>guava</artifactId>
-           <version>29.0-jre</version>
-       </dependency>
-   </dependencies>
</project>

Usage

Run this recipe

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:3.33.1

Data tables

Dependency usage evidence

org.openrewrite.java.dependencies.table.DependencyUsageEvidence

Evidence showing that a dependency is in use in the project.

Column	Description
Group	The first part of a dependency coordinate com.google.guava:guava:VERSION.
Artifact	The second part of a dependency coordinate com.google.guava:guava:VERSION.
Version	The resolved version.
Evidence	The evidence showing this dependency is in use (e.g., a type name, property value, or transitive dependency).
Evidence type	The type of evidence: 'Type usage', 'Property/YAML reference', or 'Transitive dependency'.
Source path	The path to the source file where the evidence was found.

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column	Description
Source path before the run	The source path of the file before the run. null when a source file was created during the run.
Source path after the run	A 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 changes	In 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 changes	The specific recipe that made a change.
Estimated time saving	An estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
Cycle	The recipe cycle in which the change was made.

Source files that had search results

org.openrewrite.table.SearchResults

Search results that were found during the recipe run.

Column	Description
Source path of search result before the run	The source path of the file with the search result markers present.
Source path of search result after run the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Result	The trimmed printed tree of the LST element that the marker is attached to.
Description	The content of the description of the marker.
Recipe that added the search marker	The specific recipe that added the Search marker.

Source files that errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column	Description
Source path	The file that failed to parse.
Recipe that made changes	The specific recipe that made a change.
Stack trace	The stack trace of the failure.

Recipe performance

org.openrewrite.table.RecipeRunStats

Statistics used in analyzing the performance of recipes.

Column	Description
The recipe	The recipe whose stats are being measured both individually and cumulatively.
Source file count	The number of source files the recipe ran over.
Source file changed count	The number of source files which were changed in the recipe run. Includes files created, deleted, and edited.
Cumulative scanning time (ns)	The total time spent across the scanning phase of this recipe.
Max scanning time (ns)	The max time scanning any one source file.
Cumulative edit time (ns)	The total time spent across the editing phase of this recipe.
Max edit time (ns)	The max time editing any one source file.