[Demonstration 1]

[Buggy Method]
public ParseExecutionResult executeParsers(Event event) {
    Object input = event.getField(sourceField);
    if (event.isCancelled()) {
        return ParseExecutionResult.IGNORED;
    }
    if (input == null) {
        return ParseExecutionResult.FIELD_VALUE_IS_NULL_OR_FIELD_NOT_PRESENT;
    }
    for (ParserExecutor executor : executors) {
        try {
            Instant instant = executor.execute(input, event);
            setter.set(event, instant);
            if (this.nanoSecFieldSetter != null) {
                this.nanoSecFieldSetter.set(event, instant);
            }
            return ParseExecutionResult.SUCCESS;
        } catch (IllegalArgumentException | IOException e) {
            // do nothing, try next ParserExecutor
        }
    }
    return ParseExecutionResult.FAIL;
}

[Buggy Hunk]
} catch (IllegalArgumentException | IOException e) {

[Patch]
} catch (Exception e) {

[Demonstration 2]

[Buggy Method]
private String sendRequest(String action, Map<String, String> parameters) throws KSYunClientException, KSYunServiceException {
    InputStream stream = null;
    try {
        String query = paramsToQueryString(parameters);
        URL url = new URL("https://" + endpoint + "?" + query);
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(url.toString());
        HttpResponse response = client.execute(request);
        if (response.getStatusLine().getStatusCode() >= 400) {
            stream = response.getEntity().getContent();
            String message = readContent(stream);
            CommonErrorResponse error = gson.fromJson(message, CommonErrorResponse.class);
            KSYunServiceException exception = new KSYunServiceException(error.getMessage());
            exception.setErrorCode(error.getCode());
            exception.setService(action);
            throw exception;
        } else {
            stream = response.getEntity().getContent();
            return readContent(stream);
        }
    } catch (IOException e) {
        throw new KSYunClientException("Failed to connect to KSYun:" + e.getMessage());
    } finally {
        safeClose(stream);
    }
}

[Buggy Hunk]
exception.setErrorCode(error.getCode());

[Patch]
exception.setCode(error.getCode());

[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));