output.cancel(false);
        throw new SomeUncheckedException();
      }
    }
    Transformer transformer = new Transformer();
    SettableFuture<Object> input = SettableFuture.create();

    ListenableFuture<Object> output = transform(input, transformer, directExecutor());
    transformer.output = output;

    input.set("foo");
    assertTrue(output.isCancelled());
  }

import org.apache.maven.project.MavenProject;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.deployment.DeployRequest;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven transformer manager.
 *
 * @since 4.0.0
 */
public interface TransformerManager {
    InstallRequest remapInstallArtifacts(RepositorySystemSession session, InstallRequest request);

                copy.from(new File(root, "build-tools-internal/src/main/resources/eclipse.settings"));
                copy.into(".settings");
                copy.filter(new Transformer<String, String>() {
                    @Override
                    public String transform(String s) {
                        return s.replaceAll("@@LICENSE_HEADER_TEXT@@", finalLicenseHeader);
                    }
                });
        });

                        + responseProcessor + ", url: " + url);
            }
            final Transformer transformer = ((DefaultResponseProcessor) responseProcessor).getTransformer();
            final ResultData resultData = transformer.transform(responseData);
            final Object rawData = resultData.getRawData();
            if (rawData != null) {

Existing Groovy methods will not be removed immediately.

## Consequences

* If we would have used `Closure`, we must instead use `Action<T>`, `Spec<T>`, `Callable<T>`, or `Transformer<OUT, IN>`.
* We need to ensure all APIs that are exposed in the Groovy DSL go through runtime decoration.
Runtime decoration mixes in methods that use Groovy Closures to maintain consistent behavior in Groovy DSL.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * default implementation of the metadata classpath transformer
 *
 *
 */
@Named
@Singleton
@Deprecated
public class DefaultClasspathTransformation implements ClasspathTransformation {
    @Inject
    GraphConflictResolver conflictResolver;

crawler.crawlerContext.setMaxDepth(5);               // Limit crawl depth

// Use streaming for large files
container.singleton("fileTransformer", FileTransformer.class, transformer -> {
    transformer.setMaxContentSize(10 * 1024 * 1024); // 10MB limit
});
```

## Troubleshooting

### Common Issues

#### Connection Timeouts
```java
// Increase timeout values

    @Override
    public void transform(MavenProject project, RepositorySystemSession session, ModelSource src, Path tgt)
            throws ModelBuilderException, XMLStreamException, IOException {
        throw new IllegalStateException("This transformer does not use this call.");
    }

    protected static final String NAMESPACE_FORMAT = "http://maven.apache.org/POM/%s";

            // calling the FilterReader ourselves.  We're just taking one file and turning it into another.

            // The order here is important! tokens are inserted by the transformer
            Map<String, Object> parameters = new HashMap<>();
            // NOTE: These parameter names _must_ match the setter names in ReleaseNotesTransformer

public class OpenSearchAccessResultData extends AccessResultDataImpl<String> implements ToXContent {

    /**
     * Field name for ID.
     */
    public static final String ID = "id";

    /**
     * Field name for transformer name.
     */
    public static final String TRANSFORMER_NAME = "transformerName";

    /**
     * Field name for data.
     */
    public static final String DATA = "data";

    /**