<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>tests.project</groupId>
    <artifactId>duplicate-plugin-defs-merged</artifactId>
    <version>1</version>

    <build>
      <plugins>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <dependencies>
            <dependency>
              <groupId>group</groupId>
              <artifactId>first</artifactId>
              <version>1</version>

        validator.validate(settings, problems);
        assertEquals(1, problems.messages.size());
        assertContains(
                problems.messages.get(0), "'servers.server.id' must be unique but found duplicate server with id test");
    }

    @Test
    void testValidateUniqueProfileId() throws Exception {
        Settings settings = new Settings();
        Profile profile1 = new Profile();

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.project;

import java.io.File;

/**
 * Exception that occurs when the project list contains duplicate projects instead of ignoring one.
 *
 */
public class DuplicateProjectException extends Exception {
    private final String projectId;

    private final File existingProjectFile;

        return (depMngt != null) ? Collections.unmodifiableList(depMngt.getDependencies()) : Collections.emptyList();
    }

    // TODO: this is duplicate of PomArtifactHandlerProvider provided one
    static class PomArtifactHandler implements ArtifactHandler {
        @Override
        public String getClassifier() {
            return null;
        }

 * Currently, this modification would create compatibility problems for existing plugins.
 */
public class DuplicateArtifactAttachmentException extends RuntimeException {

    private static final String DEFAULT_MESSAGE = "Duplicate artifact attachment detected.";

    private Artifact artifact;

    private final MavenProject project;

    public DuplicateArtifactAttachmentException(MavenProject project, Artifact artifact) {

        Objects.requireNonNull(projectRealm, "projectRealm cannot be null");

        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate project realm for extensions " + key);
        }

        CacheRecord record = new CacheRecord(projectRealm, extensionArtifactFilter);

        cache.put(key, record);

        return record;
    }

        return plugin.getDependencies();
    }

    public List<Dependency> getManagedDependencies() {
        return Collections.emptyList();
    }

    // TODO: this is duplicate of MavenPluginArtifactHandlerProvider provided one
    static class PluginArtifactHandler implements ArtifactHandler {
        @Override
        public String getClassifier() {
            return null;
        }

    //
    // 8) Create ReactorReader with the getProjectMap( projects ). NOTE that getProjectMap(projects) is the code that
    // checks for duplicate projects definitions in the build. Ideally this type of duplicate checking should be
    // part of getting the reactor projects in 6). The duplicate checking is conflated with getProjectMap(projects).
    //
    // 9) Execute AbstractLifecycleParticipant.afterProjectsRead(session)
    //

        Objects.requireNonNull(pluginArtifacts, "pluginArtifacts cannot be null");

        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate plugin realm for plugin " + key);
        }

        CacheRecord record = new CacheRecord(pluginRealm, pluginArtifacts);

        cache.put(key, record);

        return record;
    }

        cache.put(key, record);

        return record;
    }

    protected void assertUniqueKey(Key key) {
        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate artifact resolution result for plugin " + key);
        }
    }

    public CacheRecord put(Key key, PluginResolutionException exception) {
        Objects.requireNonNull(exception, "exception cannot be null");