[Demonstration 1]

[Buggy Method]
public static MatlabTreeBuildWalker parse(String str, Class<?> defaultParameterTypeOrInterface) {
    ANTLRInputStream input = new ANTLRInputStream(str);
    MatlabGrammarLexer lexer = new MatlabGrammarLexer(input);
    CommonTokenStream tokens = new CommonTokenStream(lexer);
    MatlabGrammarParser parser = new MatlabGrammarParser(tokens);
    ParseTree tree = parser.prog();
    ParseTreeWalker walker = new ParseTreeWalker();
    MatlabTreeBuildWalker ew = new MatlabTreeBuildWalker(defaultParameterTypeOrInterface);
    walker.walk(ew, tree);
    return ew;
}

[Buggy Hunk]
ANTLRInputStream input = new ANTLRInputStream(str);

[Patch]
ANTLRInputStream input = new ANTLRInputStream(replaceAll(str));

[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]
protected void printHand() {
    System.out.println("entering printHand");
    Iterator<Map.Entry<Integer, ArrayList<Card>>> iter = handMap.entrySet().iterator();
    while (iter.hasNext()) {
        Map.Entry<Integer, ArrayList<Card>> entry = iter.next();
        ArrayList<Card> newList = new ArrayList<Card>();
        Integer key = entry.getKey();
        ArrayList<Card> list = entry.getValue();
        String pRank = Card.convertRank(key);
        System.out.print(pRank + ":");
        for (Card card : list) {
            System.out.print(card.getSuit());
        }
        System.out.print("  ");
    }
    System.out.println();
}

[Buggy Hunk]
System.out.println("entering printHand");

[Patch]
System.out.print("entering printHand - ");