[Demonstration 1]

[Buggy Method]
public static Collection<File> findFiles(@NotNull final FileSystem fs, @NotNull final DirectoryEntry root, @NotNull final Collection<String> includes, @NotNull final Collection<String> excludes) {
    List<Wildcard> basePath = buildSearchPrefix(root, fs.caseSensitive());
    List<FileSystemPath> result = new ArrayList<FileSystemPath>();
    findFilesRec(fs.getRoot(), result, toAntPatternState(fs, basePath, fs.caseSensitive(), includes), toAntPatternState(fs, basePath, fs.caseSensitive(), excludes));
    Set<File> foundFiles = new TreeSet<File>();
    for (FileSystemPath path : result) {
        foundFiles.add(path.getFilePath());
    }
    return foundFiles;
}

[Buggy Hunk]
foundFiles.add(path.getFilePath());

[Patch]
foundFiles.add(FileUtil.getCanonicalFile(path.getFilePath()));

[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 crawlCurrentPage() throws IOException, InvalidOperationException, InvalidArgumentException {
    String data = readHTML();
    Pattern pattern = Pattern.compile("<\\s*img\\s+.*?src\\s*\\s*=?[\",',=](.*?)[\",',\\ ,>].*?>?");
    Matcher matcher = pattern.matcher(data);
    Pattern p = Pattern.compile("http:\\/\\/[0-9]+\\.media\\S*?");
    while (matcher.find()) {
        String f = matcher.group(1);
        Matcher m = p.matcher(f);
        if (m.find()) {
            collectedLinks.add(f);
        }
    }
}

[Buggy Hunk]
if (m.find()) {

[Patch]
if (m.find() && TumblrFetchingService.addImageHash(f)) {