There are cases where you want to tell your API **users** that your app could call *their* app (sending a request) with some data, normally to **notify** of some type of **event**.

This means that instead of the normal process of your users sending requests to your API, it's **your API** (or your app) that could **send requests to their system** (to their API, their app).

This is normally called a **webhook**.

import java.util.Objects;

import org.apache.maven.building.FileSource;

/**
 * Represents a model pulled from a repository
 *
 * @since 4.0.0
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public class ArtifactModelSource extends FileSource implements ModelSource {
    private final String groupId;

    private final String artifactId;

 * looks up all implementers of this interface and calls their {@link #init(Context)} method. Note:
 * Implementors are strongly advised to inherit from {@link AbstractEventSpy} instead of directly implementing this
 * interface.
 * @since 3.0.2
 */
public interface EventSpy {
    /**
     * Context
     */
    interface Context {

        /**

 * representation for models that physically look different but are semantically equivalent.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelNormalizer {

    /**
     * Merges duplicate elements like multiple declarations of the same build plugin in the specified model.
     *

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

/**
 * @deprecated use {@code org.apache.maven.api.services.model.RootLocator} instead
 */
@Named
@Deprecated(since = "4.0.0")
public class DefaultRootLocator implements RootLocator {

    @Override
    public boolean isRootDirectory(Path dir) {
        if (Files.isDirectory(dir.resolve(".mvn"))) {

 *
 */
@Deprecated
public class DebugConfigurationListener implements ConfigurationListener {
    private final Logger logger;

    /**
     * @deprecated Use {@link #DebugConfigurationListener(Logger)} instead.
     */
    @Deprecated
    public DebugConfigurationListener(org.codehaus.plexus.logging.Logger logger) {
        this(LoggerFactory.getLogger(logger.getName()));
    }

     *
     * @return The parent class realm or {@code null} if using the default parent.
     */
    ClassLoader getParent();

    /**
     * @deprecated Use {@link #getParentImports()} instead.
     * @return imports
     */
    @Deprecated
    List<String> getImports();

    /**
     * Gets the packages/types to import from the parent realm.
     *

import java.io.Reader;

import org.apache.maven.model.InputSource;
import org.apache.maven.model.Model;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * @deprecated Use MavenStaxReader instead
 */
@Deprecated
public class MavenXpp3ReaderEx extends MavenXpp3Reader {

    public MavenXpp3ReaderEx() {
        this(null);
    }

    public MavenXpp3ReaderEx(ContentTransformer contentTransformer) {

import org.apache.maven.model.building.ModelProblemCollector;

/**
 * Checks the model for missing or invalid values.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelValidator {

    /**
     * Checks the specified (raw) model for missing or invalid values. The raw model is directly created from the POM

import java.io.File;

import org.apache.maven.model.Model;

/**
 * Builds the effective model from a POM.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelBuilder {

    /**
     * Builds the effective model of the specified POM.
     *