[Demonstration 1]

[Buggy Method]
public boolean selectedRoles(final User u) {
    this.selectedRoles.clear();
    final List<Role> roles = u.getRoles();
    for (final Role r : roles) {
        this.selectedRoles.add(new Integer(r.getId()).toString());
    }
    return true;
}

[Buggy Hunk]
this.selectedRoles.add(new Integer(r.getId()).toString());

[Patch]
this.selectedRoles.add(r.getId());

[Demonstration 2]

[Buggy Method]
public UserDTO createUser(UserDTO user, String[] selectedRoles) throws TechnicalException {
    userValidator.validateUserData(user);
    User userEntity = new User();
    userDTOMapper.mapToEntity(user, userEntity);
    userEntity.setActive(true);
    userEntity.setUsername(generateUsername(user.getFirstname(), user.getLastname()));
    List<Role> roles = new ArrayList<Role>();
    for (String role : selectedRoles) {
        roles.add(roleDAO.getRoleByName(role).get(0));
    }
    userEntity.setRoles(roles);
    userDAO.persistEntity(userEntity);
    User persistedUser = userDAO.findEntity(userEntity.getId());
    return userDTOMapper.mapToDTO(persistedUser);
}

[Buggy Hunk]
roles.add(roleDAO.getRoleByName(role).get(0));

[Patch]
roles.add(roleDAO.getRoleByName(RoleType.valueOf(role)).get(0));

[Demonstration 3]

[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));