everything is fine now

CommitSumImpl.java

package nl.topicus.onderwijs.dashboard.modules.standard;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import nl.topicus.onderwijs.dashboard.datasources.Commits;
import nl.topicus.onderwijs.dashboard.datatypes.Commit;
import nl.topicus.onderwijs.dashboard.keys.Key;
import nl.topicus.onderwijs.dashboard.modules.DataSource;
import nl.topicus.onderwijs.dashboard.modules.DashboardRepository;
import nl.topicus.onderwijs.dashboard.web.WicketApplication;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CommitSumImpl implements Commits {
    private static final Logger log = LoggerFactory.getLogger(CommitSumImpl.class);

    public CommitSumImpl() {
    }

    @Override
    public List<Commit> getValue() {
        List<Commit> ret = new ArrayList<Commit>();

        DashboardRepository repository = WicketApplication.get().getRepository();

        for (Key curKey : repository.getKeys(Key.class)) {
            log.trace("curKey = {}", curKey);
            Collection<DataSource<?>> dataSources = repository.getData(curKey);
            for (DataSource<?> curDataSource : dataSources) {
                log.trace("curDataSource = {}", curDataSource);
                if (curDataSource instanceof CommitSumImpl) {
                    continue;
                }
                if (curDataSource instanceof Commits) {
                    List<Commit> newCommits = ((Commits) curDataSource).getValue();
                    if (newCommits != null) {
                        ret.addAll(newCommits);
                    }
                }
            }
        }

        return ret;
    }
}