[Demonstration 1]

[Buggy Method]
private static Schema applyQuerySymbol(QueryContext context, Schema schema, Symbol query, PersistentVector parents, IFn fn) {
    if (schema == null) {
        Column col = Column.missing();
        if (fn != null) {
            col = col.withFn(fn);
        }
        return col;
    } else if (query.equals(SUB_SCHEMA)) {
        return applyQuerySubSchema(context, schema, fn);
    } else if (schema instanceof Record) {
        throw new IllegalArgumentException(String.format("Element at path %s is a record, not a value.", parents));
    } else if (schema instanceof Collection) {
        throw new IllegalArgumentException(String.format("Element at path %s is a collection, not a value.", parents));
    } else {
        Column col = (Column) schema;
        int queriedType = context.types.getType(query);
        if (col.type != queriedType) {
            throw new IllegalArgumentException(String.format("Mismatched column types at path %s. " + "Asked for '%s' but schema defines '%s'.", parents, query, context.types.getTypeSymbol(col.type)));
        }
        if (fn != null) {
            col = col.withFn(fn);
        }
        context.appendColumn(col);
        return col;
    }
}

[Buggy Hunk]
Column col = (Column)schema;

[Patch]
Column col = ((Column)schema).withQueryColumnIndex(context.getNextQueryColumnIndex());

[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]
public static int freePort() {
    Random random = new Random();
    int port;
    do {
        port = random.nextInt(65535);
    } while (!isLocalPortUsing(port));
    return port;
}

[Buggy Hunk]
} while (!isLocalPortUsing(port));

[Patch]
} while (isLocalPortUsing(port));