portfolio.addPosition(new PortfolioPosition("VMware, Inc.", "VMW", 65.58, 23));
portfolio.addPosition(new PortfolioPosition("Red Hat", "RHT", 48.30, 15));
this.portfolioLookup.put("paulson", portfolio);</BUG>
}
<BUG>public Portfolio findPortfolio(String username) {
Portfolio portfolio = this.portfolioLookup.get(username);
if (portfolio == null) {
throw new IllegalArgumentException(username);
}
return portfolio;
}
}</BUG>

package ch.rasc.s4ws.portfolio.service;
import ch.rasc.s4ws.portfolio.Portfolio;
public interface PortfolioService {
Portfolio findPortfolio(String username);
