[Demonstration 1]

[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 2]

[Buggy Method]
private Collection<IDependency> getDependencies(IDependencyManager dependencyManager, IDependency[] dependencies) {
    Set<IDependency> result = new LinkedHashSet<IDependency>();
    if (dependencyManager == null) {
        result.addAll(Arrays.asList(dependencies));
        return result;
    }
    Collection<String> dependencyNames = null;
    try {
        dependencyNames = dependencyManager.getAllDependencies();
        if (dependencyNames == null) {
            result.addAll(Arrays.asList(dependencies));
            return result;
        }
    } catch (Exception e) {
        return Arrays.asList(dependencies);
    }
    for (IDependency dependency : dependencies) {
        String value = dependency.getNode().getIdentifier();
        value = value.replaceAll("\\*", "\\\\E.*\\\\Q");
        value = value.replaceAll("\\?", "\\\\E.\\\\Q");
        value = "\\Q" + value + "\\E";
        for (String dependencyName : dependencyNames) {
            if (Pattern.matches(value, dependencyName)) {
                result.add(new Dependency(dependency.getType(), new IdentifierNode(dependency.getNode().getType(), null, dependencyName, null)));
            }
        }
    }
    return result;
}

[Buggy Hunk]
Collection<String> dependencyNames = null;

[Patch]
Collection<String> dependencyNames;

[Demonstration 3]

[Buggy Method]
private static ArrayList<String> splitByWhitespace(String toSplit) {
    return new ArrayList(Arrays.asList(toSplit.trim().split("\\s+")));
}

[Buggy Hunk]
return new ArrayList(Arrays.asList(toSplit.trim().split("\\s+")));

[Patch]
return new ArrayList<String>(Arrays.asList(toSplit.trim().split("\\s+")));