db.java

public static class ManagedDatasource {

    final BoneCPDataSource ds;
    final String url;
    
    public ManagedDatasource(BoneCPDataSource ds, String url) {
        this.ds = ds;
        this.url = url;
    }

}

private DBApi dbs = null;

private DBApi getDbs() {
    synchronized(dbs) {
        if(dbs == null) {
            Configuration dbConf = app.configuration.getSub("db");
            Map<String,ManagedDatasource> datasources = new HashMap<String,ManagedDatasource>();
            if(dbConf != null) {
                for(String key: dbConf.subkeys()) {
                    ManagedDatasource ds = DBApi.createDataSource(dbConf.getSub(key), app.classloader);
                    datasources.put(key, new ManagedDatasource(ds));
                }
            } 
            dbs = new DBApi(datasources);
        }
        return dbs;
    }
}

db.scala

lazy val dbs = {
    DBApi(app.configuration.getSub("db").map { dbConf =>
        dbConf.subKeys.map { db =>
            db -> DBApi.createDataSource(dbConf.getSub(db).get, app.classloader)
        }.toMap
    }.getOrElse(Map.empty))
}