Class DeduplicateDependenciesStrategy

java.lang.Object

org.apache.maven.cling.invoker.mvnup.goals.AbstractUpgradeStrategy

org.apache.maven.cling.invoker.mvnup.goals.DeduplicateDependenciesStrategy

All Implemented Interfaces:

UpgradeStrategy

@Named
@Singleton
@Priority(19)
public class DeduplicateDependenciesStrategy
extends AbstractUpgradeStrategy

Strategy for deduplicating dependency and plugin declarations in POM files.

Maven 4 rejects duplicate <dependency> entries (same groupId, artifactId, type, and classifier) that Maven 3 silently accepted. This strategy scans each POM's <dependencies> and <dependencyManagement>/<dependencies> sections and removes duplicates using last-wins semantics (keeping the last declaration). Note that Maven 3's dependency resolver uses first-wins for same-depth conflicts; last-wins is chosen here intentionally so the most recently added (and presumably most up-to-date) declaration is preserved.

The strategy also handles duplicate <plugin> entries in <plugins> and <pluginManagement>/<plugins> sections with the same last-wins semantics (which does match Maven 3's plugin configuration merging behavior).

Profile-scoped dependency and plugin sections are processed as well.

Constructor Summary

Constructors

Constructor	Description
DeduplicateDependenciesStrategy()

Method Summary

Modifier and Type	Method	Description
protected UpgradeResult	doApply(UpgradeContext context, Map<Path, eu.maveniverse.domtrip.Document> pomMap)	Subclasses implement the actual upgrade logic here.
String	getDescription()	Gets a description of what this strategy does.
boolean	isApplicable(UpgradeContext context)	Checks if this strategy is applicable given the current options.

Methods inherited from class AbstractUpgradeStrategy

apply, buildEffectiveModel, cleanupTempDirectory, computeAllArtifactCoordinates, createTempProjectStructure, extractArtifactCoordinatesWithParentResolution, findCommonRoot, getOptions, getSession, logSummary

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface UpgradeStrategy

isOptionEnabled

Constructor Details

DeduplicateDependenciesStrategy

public DeduplicateDependenciesStrategy()

Method Details

isApplicable

public boolean isApplicable(UpgradeContext context)

Description copied from interface: UpgradeStrategy

Checks if this strategy is applicable given the current options.

Parameters:

context - the upgrade context

Returns:

true if this strategy should be applied

getDescription

public String getDescription()

Description copied from interface: UpgradeStrategy

Gets a description of what this strategy does.

Returns:

a human-readable description of the strategy

doApply

protected UpgradeResult doApply(UpgradeContext context,
 Map<Path, eu.maveniverse.domtrip.Document> pomMap)

Description copied from class: AbstractUpgradeStrategy

Subclasses implement the actual upgrade logic here.

Specified by:

doApply in class AbstractUpgradeStrategy

Parameters:

context - the upgrade context

pomMap - map of all POM files in the project

Returns:

the result of the upgrade operation