[Demonstration 1]

[Buggy Method]
private static void scanPackageInner(File dir, String pkg, Set<String> packages) {
    if (!dir.isDirectory()) {
        return;
    }
    File[] files = dir.listFiles();
    if (files == null)
        return;
    Boolean isAllDirectory = true;
    for (File f : files) {
        isAllDirectory = (f != null && f.isDirectory());
    }
    if (isAllDirectory) {
        for (File f : files) {
            String prefix = (pkg == null) ? "" : pkg + ".";
            scanPackageInner(f, prefix + dir.getName(), packages);
        }
    } else {
        packages.add(pkg == null ? dir.getName() : pkg);
    }
}

[Buggy Hunk]
packages.add(pkg == null ? dir.getName() : pkg);

[Patch]
packages.add(pkg == null ? dir.getName() : pkg + "." + dir.getName());

[Demonstration 2]

[Buggy Method]
private void dumpFlag(StringBuilder s, boolean flag) {
    s.append(flag ? "1 " : "0 ");
}

[Buggy Hunk]
private void dumpFlag(StringBuilder s, boolean flag) {

[Patch]
private static void dumpFlag(StringBuilder s, boolean flag) {

[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));