[Demonstration 1]

[Buggy Method]
private Date getDate(String text) throws ParseException {
    String pattern = "([0-9]{2}\\/[0-9]{2}\\/[0-9]{4})";
    // Create a Pattern object
    Pattern r = Pattern.compile(pattern);
    // Now create matcher object.
    Matcher matcher = r.matcher(text);
    String dateString = null;
    if (matcher.find()) {
        dateString = matcher.group(1);
    }
    final Date parseDate = DateUtils.parseDate(dateString, "dd/MM/yyyy");
    return parseDate;
}

[Buggy Hunk]
final Date parseDate = DateUtils.parseDate(dateString, "dd/MM/yyyy");

[Patch]
final Date parseDate = DateUtil.parseDateFromPtString(dateString);

[Demonstration 2]

[Buggy Method]
private Object getForeignKeyValue(EntityInfo entityInfo, ClassMetadata meta, String foreignKeyName) {
    Object entity = entityInfo.entity;
    Object id = null;
    if (foreignKeyName == meta.getIdentifierPropertyName())
        id = meta.getIdentifier(entity, null);
    else if (Arrays.asList(meta.getPropertyNames()).contains(foreignKeyName))
        id = meta.getPropertyValue(entity, foreignKeyName);
    else if (meta.getIdentifierType().isComponentType()) {
        // compound key
        ComponentType compType = (ComponentType) meta.getIdentifierType();
        int index = Arrays.asList(compType.getPropertyNames()).indexOf(foreignKeyName);
        if (index >= 0) {
            Object idComp = meta.getIdentifier(entity, null);
            id = compType.getPropertyValue(idComp, index, EntityMode.POJO);
        }
    }
    if (id == null && entityInfo.entityState == EntityState.Deleted) {
        id = entityInfo.originalValuesMap.get(foreignKeyName);
    }
    return id;
}

[Buggy Hunk]
if (foreignKeyName == meta.getIdentifierPropertyName())

[Patch]
if (foreignKeyName.equalsIgnoreCase(meta.getIdentifierPropertyName()))

[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));