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

Class NashornCompatibilityStrategy

java.lang.Object

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

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

All Implemented Interfaces:

UpgradeStrategy

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

Strategy for injecting the standalone OpenJDK Nashorn engine as a plugin dependency when maven-antrun-plugin uses inline JavaScript via <script language="javascript">.

Maven 4 requires JDK 17+, but the built-in Nashorn JavaScript engine was removed in JDK 15. Plugins executing JavaScript in-process (particularly maven-antrun-plugin with <script language="javascript">) fail with:

 [ERROR] Unable to create javax script engine for javascript
 

Toolchains cannot help because the script runs in Maven's own JVM, not in a forked process. The standalone OpenJDK Nashorn (org.openjdk.nashorn:nashorn-core) provides a drop-in replacement that registers via ServiceLoader and restores JavaScript support.

This strategy both injects the Nashorn dependency as a quick fix and warns that users should consider migrating to GraalVM JavaScript (org.graalvm.js:js-scriptengine) for long-term support.

See Also:

• #12988

Constructor Summary

Constructors

Constructor	Description
NashornCompatibilityStrategy()

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

apply, buildEffectiveModel, computeAllArtifactCoordinates, extractArtifactCoordinatesWithParentResolution, findCommonRoot, getOptions, getSession, logSummary, remoteResolutionUnsupportedReason

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.maven.cling.invoker.mvnup.goals.UpgradeStrategy

isOptionEnabled

Constructor Details

NashornCompatibilityStrategy

public NashornCompatibilityStrategy()

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