[Demonstration 1]

[Buggy Method]
@Override
public void run() {
    new HangmanFrame(new HangmanModel());
}

[Buggy Hunk]
new HangmanFrame(new HangmanModel());

[Patch]
HangmanFrame hangmanFrame = new HangmanFrame(new HangmanModel());

[Demonstration 2]

[Buggy Method]
public static Result service(String ownerName, String projectName, String service, boolean isAdvertise) throws IOException, UnsupportedOperationException, ServletException {
    if (!isSupportedService(service)) {
        return forbidden(String.format("Unsupported service: '%s'", service));
    }
    Project project = Project.findByOwnerAndProjectName(ownerName, projectName);
    if (project == null) {
        return notFound();
    }
    models.User user = UserApp.currentUser();
    if (!isAllowed(project, service)) {
        if (user.isAnonymous()) {
            return BasicAuthAction.unauthorized(response());
        } else {
            // If you want the Git client showing your custom message to
            // the user, the Content-Type should be exact "text/plain"
            // without any parameter. For more details, see the code at
            // https://github.com/git/git/commit/426e70d4a11ce3b4f70636d57c6a0ab16ae08a00#diff-eea0ad565ec5903a11b6023755d491cfR154
            response().setHeader("Content-Type", "text/plain");
            return forbidden(String.format("'%s' has no permission to '%s/%s'.", user.name, ownerName, projectName));
        }
    }
    if (isAdvertise) {
        return ok(RepositoryService.gitAdvertise(project, service, response()));
    } else {
        if (request().body().isMaxSizeExceeded()) {
            return status(REQUEST_ENTITY_TOO_LARGE);
        } else {
            user.visits(project);
            return ok(RepositoryService.gitRpc(project, service, request(), response()));
        }
    }
}

[Buggy Hunk]
user.name, ownerName, projectName));

[Patch]
user.loginId, ownerName, projectName));

[Demonstration 3]

[Buggy Method]
private void changePanel(JPanel newPanel, boolean back) {
    for (Component c : currentHeader.getComponents()) {
        if (c instanceof JButton) {
            JButton btn = (JButton) c;
            if (btn.getText() == "Back") {
                if (!back)
                    this.parentWindows.push(currentContent);
                if (this.parentWindows.size() > 0)
                    btn.setEnabled(true);
                else
                    btn.setEnabled(false);
                break;
            }
        }
    }
    frmShipt.getContentPane().remove(currentContent);
    frmShipt.getContentPane().add(newPanel, BorderLayout.CENTER);
    currentContent = newPanel;
    currentContent.validate();
    frmShipt.revalidate();
    frmShipt.repaint();
}

[Buggy Hunk]
if(this.parentWindows.size() > 0)

[Patch]
if(this.parentWindows.size() -1 > 0)