private static final Pattern FILE_NAME_PATTERN = Pattern.compile("(groovy(-.+?)?)-(\\d.+?)\\.jar");

    private final DetachedResolver resolver;

    public DefaultGradleApiSourcesResolver(DetachedResolver resolver) {
        this.resolver = resolver;
        addGradleLibsRepository();
    }

    @Override
    public File resolveLocalGroovySources(String jarName) {

ler.manager.ArtifactHandlerManag org.apache.maven.artifact.resolver.ArtifactCollector org.apache.maven.artifact.resolver.DefaultArtifactColle org.apache.maven.artifact.resolver.conflict.ConflictResolver org.apache.maven.artifact.resolver.conflict.ConflictResolver default org.apache.maven.artifact.resolver.conflict.NearestConflictResol org.apache.maven.artifact.resolver.conflict.ConflictResolver nearest org.apache.maven.artifact.resolver.conflict.NearestConflictResol org.apache.maven.artifact.res...

import org.gradle.internal.resolve.resolver.ArtifactResolver;
import org.gradle.internal.resolve.result.BuildableArtifactResolveResult;
import org.gradle.internal.resolve.result.BuildableArtifactSetResolveResult;

public class ErrorHandlingArtifactResolver implements ArtifactResolver {
    private final ArtifactResolver resolver;

    public ErrorHandlingArtifactResolver(ArtifactResolver resolver) {
        this.resolver = resolver;
    }

            this.resolver = resolver;
            this.patternSetFactory = patternSetFactory;
            this.taskDependencyFactory = taskDependencyFactory;
            setFrom(owner, resolver, patternSetFactory, taskDependencyFactory, propertyHost, item);
        }

    }

    @Test public void testResolveUriObjectToUri() {
        URI uri = new URI("http://www.gradle.org")
        assertEquals(uri, baseDirConverter.resolveUri(uri))
    }

    @Test public void testResolveUrlObjectToUri() {
        assertEquals(new URI("http://www.gradle.org"), baseDirConverter.resolveUri(new URL("http://www.gradle.org")))
    }

import org.apache.maven.artifact.resolver.ResolutionListener;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.repository.legacy.resolver.conflict.ConflictResolver;

/**
 * Artifact collector - takes a set of original artifacts and resolves all of the best versions to use
 * along with their metadata. No artifacts are downloaded.
 *
 */
@Deprecated
@SuppressWarnings("checkstyle:parameternumber")

    public void test_toAscii() {
        IdnDnsResolver resolver = new IdnDnsResolver();

        String host = "www.codelibs.org";
        String expected = "www.codelibs.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "テスト.org";
        expected = "xn--zckzah.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "xn--zckzah.org";

        then:
        resource.exists
        !resource.hasEmptyContent
        resource.text == '<content>'
        resource.asReader.text == '<content>'
    }

    def assumesFileIsEncodedUsingUtf8() throws IOException {
        when:
        file.setText('\u03b1', 'utf-8')

        UriTextResource resource = new UriTextResource('<display-name>', file, resolver)

        then:

        private final PathToFileResolver resolver;

        ResolvingRegularFileTransform(PathToFileResolver resolver) {
            this.resolver = resolver;
        }

        @Override
        public RegularFile transform(CharSequence path) {
            return new FixedFile(resolver.resolve(path));
        }
    }

====

In general, when applying toolchain resolver plugins, the toolchain download resolvers provided by them also need to be configured.
Let's illustrate with an example.
Consider two toolchain resolver plugins applied by the build:

* One is the Foojay plugin mentioned above, which downloads toolchains via the `FoojayToolchainResolver` it provides.
* The other contains a **FICTITIOUS** resolver named `MadeUpResolver`.