* or a simple string message. In addition, a problem carries a hint about its source, e.g. the POM file that exhibits
 * the problem.
 *
 */
public class DefaultModelProblem implements ModelProblem {

    private final String source;

    private final int lineNumber;

    private final int columnNumber;

    private final String modelId;

import org.apache.maven.execution.ProjectActivation;
import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.model.Plugin;
import org.apache.maven.model.building.DefaultModelProblem;
import org.apache.maven.model.building.Result;
import org.apache.maven.project.CycleDetectedException;
import org.apache.maven.project.DuplicateProjectException;
import org.apache.maven.project.MavenProject;

import org.apache.maven.internal.impl.resolver.DefaultModelRepositoryHolder;
import org.apache.maven.model.building.ArtifactModelSource;
import org.apache.maven.model.building.DefaultModelProblem;
import org.apache.maven.model.building.FileModelSource;
import org.apache.maven.model.building.ModelSource2;
import org.apache.maven.model.building.ModelSource3;

            line = e.getLineNumber();
            column = e.getColumnNumber();
        }

        ModelProblem problem =
                new DefaultModelProblem(message, severity, version, source, line, column, modelId, exception);

        add(problem);
    }

    public ModelBuilderException newModelBuilderException() {

        try {
            dag.addEdge(from.toString(), p.toString());
            return true;
        } catch (Graph.CycleDetectedException e) {
            problems.add(new DefaultModelProblem(
                    "Cycle detected between models at " + from + " and " + p,
                    ModelProblem.Severity.FATAL,
                    null,
                    null,
                    0,