apache/maven · error · ExtensionResolutionException

Extension {extensionId} or one of its dependencies could not

Error message

Extension {extensionId} or one of its dependencies could not be resolved: {causeMessage}

What it means

Error "Extension {extensionId} or one of its dependencies could not be resolved: {causeMessage}" thrown in apache/maven.

Source

Thrown at impl/maven-cli/src/main/java/org/apache/maven/cling/extensions/BootstrapCoreExtensionManager.java:237

        try {
            /* TODO: Enhance the PluginDependenciesResolver to provide a
             * resolveCoreExtensionAndFlatten method which uses a CoreExtension
             * object instead of a Plugin as this makes no sense.
             */
            Plugin plugin = Plugin.newBuilder()
                    .groupId(interpolator.apply(extension.getGroupId()))
                    .artifactId(interpolator.apply(extension.getArtifactId()))
                    .version(interpolator.apply(extension.getVersion()))
                    .build();

            DependencyResult result = pluginDependenciesResolver.resolveCoreExtensionAndFlatten(
                    new org.apache.maven.model.Plugin(plugin), dependencyFilter, repositories, repoSession);
            return result.getArtifactResults().stream()
                    .filter(ArtifactResult::isResolved)
                    .map(ArtifactResult::getArtifact)
                    .collect(Collectors.toList());
        } catch (PluginResolutionException | InterpolatorException e) {
            throw new ExtensionResolutionException(extension, e);
        }
    }

    private UnaryOperator<String> createInterpolator(MavenExecutionRequest request) {
        UnaryOperator<String> callback = v -> {
            String r = request.getUserProperties().getProperty(v);
            if (r == null) {
                r = request.getSystemProperties().getProperty(v);
            }
            return r != null ? r : v;
        };
        return v -> interpolator.interpolate(v, callback);
    }

    static class SimpleSession extends DefaultSession {
        SimpleSession(
                MavenSession session,
                RepositorySystem repositorySystem,

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at impl/maven-cli/src/main/java/org/apache/maven/cling/extensions/BootstrapCoreExtensionManager.java:237 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/13ed9171f764cc8b. Report an issue: GitHub.