List<ReportSet> src = source.getReportSets();
        if (!src.isEmpty()) {
            List<ReportSet> tgt = target.getReportSets();
            Map<Object, ReportSet> merged = new LinkedHashMap<>((src.size() + tgt.size()) * 2);

            for (ReportSet rset : src) {

package org.apache.maven.model.plugin;

import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.model.Model;
import org.apache.maven.model.ReportPlugin;
import org.apache.maven.model.ReportSet;
import org.apache.maven.model.Reporting;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblemCollector;
import org.codehaus.plexus.util.xml.Xpp3Dom;

/**

            return getPluginKey(plugin);
        }
    }

    /**
     * KeyComputer for ReportSet
     */
    private class ReportSetKeyComputer implements KeyComputer<ReportSet> {
        @Override
        public Object key(ReportSet reportSet) {
            return getReportSetKey(reportSet);
        }
    }

    /**
     * KeyComputer for Notifier
     */

                    if (reportSetId != null) {
                        ReportSet reportSet = plugin.getReportSetsAsMap().get(reportSetId);
                        if (reportSet != null) {
                            Xpp3Dom executionConfiguration = (Xpp3Dom) reportSet.getConfiguration();
                            if (executionConfiguration != null) {