[Demonstration 1]

[Buggy Method]
@GET
@Path("/semester/{semester-id}/courseid/{course-id}/examtype/{exam-type}/coursetype/{course-type}/role/{role}/totalpart/{total-part}")
public StreamingOutput get(@Context final Request pRequest, @PathParam("semester-id") final Integer pSemesterId, @PathParam("course-id") final String pCourseId, @PathParam("exam-type") final Integer pExamTypeId, @PathParam("course-type") final Integer pCourseType, @PathParam("role") final String pRequestedRole, @PathParam("total-part") final String pTotalPart) {
    NumberFormat nf = new DecimalFormat("##.#");
    List<StudentGradeDto> gradeList = mExamGradeManager.getAllGrades(pSemesterId, pCourseId, ExamType.get(pExamTypeId), CourseType.get(pCourseType));
    List<StudentGradeDto> modifiedGradeList = new ArrayList<>();
    for (StudentGradeDto gradeDto : gradeList) {
        if (gradeDto.getPartAAddiInfo() == null) {
            gradeDto.setPartAAddiInfo(String.valueOf(gradeDto.getPartA() == null ? "" : nf.format(gradeDto.getPartA())));
        } else if (gradeDto.getPartBAddiInfo() == null) {
            gradeDto.setPartBAddiInfo(String.valueOf(gradeDto.getPartB() == null ? "" : nf.format(gradeDto.getPartB())));
        }
        modifiedGradeList.add(gradeDto);
    }
    return new StreamingOutput() {

        public void write(OutputStream output) throws IOException, WebApplicationException {
            try {
                String fileName = CourseType.get(pCourseType).getLabel();
                if (CourseType.get(pCourseType) == CourseType.THEORY) {
                    fileName = CourseType.get(pCourseType).getLabel() + "_" + pTotalPart + "Part";
                }
                InputStream a = UgGradeSheetXls.class.getResourceAsStream("/report/xls/template/" + fileName + ".xls");
                xlsGenerator.build(modifiedGradeList, output, a);
            } catch (Exception e) {
                throw new WebApplicationException(e);
            }
        }
    };
}

[Buggy Hunk]
else if(gradeDto.getPartBAddiInfo() == null) {

[Patch]
if(gradeDto.getPartBAddiInfo() == null) {

[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]
@Override
public Transaction tx() {
    return getBaseGraph().tx();
}

[Buggy Hunk]
return getBaseGraph().tx();

[Patch]
return getInnerGraph().tx();