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Analysing Aliasing in Java Applications
IT 20 048 Examensarbete 15 hp Augusti 2020 Analysing Aliasing in Java Applications Björn Berggren Institutionen för informationsteknologi Department of Information Technology Abstract Analysing Aliasing in Java Applications Björn Berggren Teknisk- naturvetenskaplig fakultet UTH-enheten Aliasing refers to the possibility of having multiple references to the same memory location and is a cornerstone concept in the imperative programming paradigm. As Besöksadress: applications grow large, it is hard for programmers to keep track of all places in the Ångströmlaboratoriet Lägerhyddsvägen 1 code where they employ aliasing, possibly resulting in hard-to-predict runtime errors. Hus 4, Plan 0 I present a tool, model and query language to perform dynamic aliasing analysis on Java programs. The tool uses the model to simulate the full execution of a program, Postadress: including how and when objects and references between them are created and Box 536 751 21 Uppsala removed. The query language consists of constructs that can be nested to form logical expressions, operating on the model to check whether a certain object remains in a Telefon: certain condition throughout the execution. The language is designed to monitor 018 – 471 30 03 lifetimes of specific objects and collect information about the execution as a whole. I Telefax: performed an experiment using the tool, examining traces from programs for 018 – 471 30 00 profiling, searching and parsing, showing that applications have different aliasing behaviour. All programs mostly use objects based on built-in Java classes, indicating Hemsida: that programmers could benefit from gaining the ability to control and limit how such http://www.teknat.uu.se/student objects can be aliased. -
Automatic Detection of Bad Smells in Code: an Experimental Assessment
Journal of Object Technology Published by AITO — Association Internationale pour les Technologies Objets, c JOT 2011 Online at http://www.jot.fm. Automatic detection of bad smells in code: An experimental assessment Francesca Arcelli Fontanaa Pietro Braionea Marco Zanonia a. DISCo, University of Milano-Bicocca, Italy Abstract Code smells are structural characteristics of software that may indicate a code or design problem that makes software hard to evolve and maintain, and may trigger refactoring of code. Recent research is active in defining automatic detection tools to help humans in finding smells when code size becomes unmanageable for manual review. Since the definitions of code smells are informal and subjective, assessing how effective code smell detection tools are is both important and hard to achieve. This paper reviews the current panorama of the tools for automatic code smell detection. It defines research questions about the consistency of their responses, their ability to expose the regions of code most affected by structural decay, and the relevance of their responses with respect to future software evolution. It gives answers to them by analyzing the output of four representative code smell detectors applied to six different versions of GanttProject, an open source system written in Java. The results of these experiments cast light on what current code smell detection tools are able to do and what the relevant areas for further improvement are. Keywords code smells; code smell detection tools; refactoring; software quality evaluation. 1 Introduction Nowadays there is an increasing number of software analysis tools available for detecting bad programming practices, highlighting anomalies, and in general increasing the awareness of the software engineer about the structural features of the program under development. -
Preliminary Report on Empirical Study of Repeated Fragments in Internal Documentation
Proceedings of the Federated Conference on Computer Science DOI: 10.15439/2016F524 and Information Systems pp. 1573–1576 ACSIS, Vol. 8. ISSN 2300-5963 Preliminary Report on Empirical Study of Repeated Fragments in Internal Documentation Milan Nosál’, Jaroslav Porubän Department of Computers and Informatics, Faculty of Electrical Engineering and Informatics, Technical University of Košice Letná 9, 042 00, Košice, Slovakia Email: [email protected], [email protected] Abstract—In this paper we present preliminary results of an safe and therefore the programmer has to pay extra caution empirical study, in which we used copy/paste detection (PMD when using it in multithreaded systems (she has to use Event CPD implementation) to search for repeating documentation Dispatch Thread to safely work with the Swing components). fragments. The study was performed on 5 open source projects, including Java 8 SDK sources. The study shows that there are Swing JavaDoc documents it and for each affected class many occurrences of copy-pasting documentation fragments in includes a warning (see JPanel documentation in Figure 1). the internal documentation, e.g., copy-pasted method parameter description. Besides these, many of the copy-pasted fragments express some domain or design concern, e.g., that the method is obsolete and deprecated. Therefore the study indicates that the cross-cutting concerns are present in the internal documentation in form of documentation phrases. I. INTRODUCTION RESERVING and comprehending developer’s concerns P (intents) in the source code is still a current challenge in software development [1], [2], [3], [4]. In this paper we analyze the internal documentation (source code comments, JavaDoc, etc.) to recognize repeating documentation fragments that document those concerns (or features [5]). -
Evaluating Dependency Based Package-Level Metrics for Multi-Objective Maintenance Tasks
(IJACSA) International Journal of Advanced Computer Science and Applications, Vol. 8, No. 10, 2017 Evaluating Dependency based Package-level Metrics for Multi-objective Maintenance Tasks Mohsin Shaikh Adil Ansari Kashif Memon Qaid-e-Awam University Qaid-e-Awam University UCET, The Islamia University of Engineering Science of Engineering Science of Bahwalpur and Technology, Nawabshah and Technology, Nawabshah Akhtar Hussain Jalbani Ahmed Ali Qaid-e-Awam University Qaid-e-Awam University of Engineering Science of Engineering Science and Technology, Nawabshah and Technology, Nawabshah Abstract—Role of packages in organization and maintenance determine quality attributes of object oriented source code of software systems has acquired vital importance in recent [3], [4]. Conventionally, software evolution process has been research of software quality. With an advancement in modu- subject to structural and architectural changes in the source larization approaches of object oriented software, packages are code, targeting suitable and organized placement of classes widely considered as re-usable and maintainable entities of object- in particular. However, such re-factoring practices can cause oriented software architectures, specially to avoid complicated de- drift and deterioration in modularization quality of software pendencies and insure software design of well identified services. In this context, recently research study of H. Abdeen on automatic [5]. Consequently, to insure flexible software modularization, optimization of package dependencies -
Write Your Own Rules and Enforce Them Continuously
Ultimate Architecture Enforcement Write Your Own Rules and Enforce Them Continuously SATURN May 2017 Paulo Merson Brazilian Federal Court of Accounts Agenda Architecture conformance Custom checks lab Sonarqube Custom checks at TCU Lessons learned 2 Exercise 0 – setup Open www.dontpad.com/saturn17 Follow the steps for “Exercise 0” Pre-requisites for all exercises: • JDK 1.7+ • Java IDE of your choice • maven 3 Consequences of lack of conformance Lower maintainability, mainly because of undesired dependencies • Code becomes brittle, hard to understand and change Possible negative effect • on reliability, portability, performance, interoperability, security, and other qualities • caused by deviation from design decisions that addressed these quality requirements 4 Factors that influence architecture conformance How effective the architecture documentation is Turnover among developers Haste to fix bugs or implement features Size of the system Distributed teams (outsourcing, offshoring) Accountability for violating design constraints 5 How to avoid code and architecture disparity? 1) Communicate the architecture to developers • Create multiple views • Structural diagrams + behavior diagrams • Capture rationale Not the focus of this tutorial 6 How to avoid code and architecture disparity? 2) Automate architecture conformance analysis • Often done with static analysis tools 7 Built-in checks and custom checks Static analysis tools come with many built-in checks • They are useful to spot bugs and improve your overall code quality • But they’re -
IBM Host Access Transformation Services: Rich Client Platform Programmer's Guide Chapter 1
IBM Host Access Transformation Services Rich Client Platform Programmer's Guide Ve r s i o n 9.5 SC27-5903-01 IBM Host Access Transformation Services Rich Client Platform Programmer's Guide Ve r s i o n 9.5 SC27-5903-01 Note Before using this information and the product it supports, be sure to read the general information under Appendix B, “Notices,” on page 125. Eighth Edition (November 2015) © Copyright IBM Corporation 2007, 2015. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Chapter 1. Introduction ........1 Using the runtime service .........36 Code examples .............2 Using the application service ........37 Using the API documentation (Javadoc) .....2 Using the client service ..........37 Using the session service ..........38 Chapter 2. Plug-ins and application Integration with other Eclipse UI views .....41 classes ...............3 An incoming communication scenario ....41 Samples ...............42 Plug-in project extension points ........4 Sample class and methods showing how to Allowing only one instance of an application . 4 access the different runtime services .....42 HATS runtime extension plug-in........5 Listening for 3270 Print Jobs........46 Application classes ............8 Creating a custom composite for use with the HostAccessApplication ..........8 Show action .............50 HostAccessWorkbenchAdvisor .......9 HostAccessWorkbenchWindowAdvisor ....10 Chapter 7. Integrating business logic 53 HostAccessActionBarAdvisor .......11 -
Profile Detection Through Source Code Static Analysis
Profile Detection Through Source Code Static Analysis Daniel Ferreira Novais1, Maria João Varanda Pereira2, and Pedro Rangel Henriques3 1 Departamento de Informática & Centro Algoritmi, Universidade do Minho, Braga, Portugal [email protected] 2 Departamento de Informática e Comunicações & Centro Algoritmi, Instituto Politécnico de Bragança, Bragança, Portugal [email protected] 3 Departamento de Informática & Centro Algoritmi, Universidade do Minho, Braga, Portugal [email protected] Abstract The present article reflects the progress of an ongoing master’s dissertation on language engin- eering. The main goal of the work here described, is to infer a programmer’s profile through the analysis of his source code. After such analysis the programmer shall be placed on a scale that characterizes him on his language abilities. There are several potential applications for such pro- filing, namely, the evaluation of a programmer’s skills and proficiency on a given language or the continuous evaluation of a student’s progress on a programming course. Throughout the course of this project and as a proof of concept, a tool that allows the automatic profiling of a Java programmer is under development. This tool is also introduced in the paper and its preliminary outcomes are discussed. 1998 ACM Subject Classification D.2.8 Metrics, D.3.4 Processors Keywords and phrases Static analysis, metrics, programmer profiling Digital Object Identifier 10.4230/OASIcs.SLATE.2016.9 1 Introduction Proficiency on a programming language can be compared to proficiency on a natural lan- guage [7]. Using, for example, the Common European Framework of Reference for Languages: Learning, Teaching, Assessment (CEFR) method1 it is possible to classify individuals based on their proficiency on a given foreign language. -
Yestercode: Improving Code-Change Support in Visual Dataflow
Yestercode: Improving Code-Change Support in Visual Dataflow Programming Environments Austin Z. Henley, Scott D. Fleming Department of Computer Science University of Memphis Memphis, Tennessee 38152-3240 Email: azhenley, Scott.Fleming @memphis.edu { } Abstract—In this paper, we present the Yestercode tool for sup- and BeneFactor [9]), and code smell detection (e.g., PMD porting code changes in visual dataflow programming environ- and DETEX [15]). Although a few researchers have begun ments. In a formative investigation of LabVIEW programmers, investigating code-change support for visual programming we found that making code changes posed a significant challenge. To address this issue, we designed Yestercode to enable the environments (e.g., SDPA [6]), the work is still in the early efficient recording, retrieval, and juxtaposition of visual dataflow stages, and has yet to see widespread adoption in practice. code while making code changes. To evaluate Yestercode, we im- In our own formative interviews of LabVIEW programmers plemented our design as a prototype extension to the LabVIEW (Section III-A), many confirmed that making code changes programming environment, and ran a user study involving 14 was currently difficult and problematic. professional LabVIEW programmers that compared Yestercode- extended LabVIEW to the standard LabVIEW IDE. Our results In a formative user study of LabVIEW programmers showed that Yestercode users introduced fewer bugs during engaged in refactoring (Section III-B), we found that the tasks, completed tasks in about the same time, and experienced programmers encountered considerable challenges during lower cognitive loads on tasks. Moreover, participants generally rewiring. In visual dataflow languages, rewiring may in- reported that Yestercode was easy to use and that it helped in volve changing existing wires to connect to different box making change tasks easier. -
Openchrom: a Cross-Platform Open Source Software for the Mass Spectrometric Analysis of Chromatographic Data Philip Wenig*, Juergen Odermatt
Wenig and Odermatt BMC Bioinformatics 2010, 11:405 http://www.biomedcentral.com/1471-2105/11/405 SOFTWARE Open Access OpenChrom: a cross-platform open source software for the mass spectrometric analysis of chromatographic data Philip Wenig*, Juergen Odermatt Abstract Background: Today, data evaluation has become a bottleneck in chromatographic science. Analytical instruments equipped with automated samplers yield large amounts of measurement data, which needs to be verified and analyzed. Since nearly every GC/MS instrument vendor offers its own data format and software tools, the consequences are problems with data exchange and a lack of comparability between the analytical results. To challenge this situation a number of either commercial or non-profit software applications have been developed. These applications provide functionalities to import and analyze several data formats but have shortcomings in terms of the transparency of the implemented analytical algorithms and/or are restricted to a specific computer platform. Results: This work describes a native approach to handle chromatographic data files. The approach can be extended in its functionality such as facilities to detect baselines, to detect, integrate and identify peaks and to compare mass spectra, as well as the ability to internationalize the application. Additionally, filters can be applied on the chromatographic data to enhance its quality, for example to remove background and noise. Extended operations like do, undo and redo are supported. Conclusions: OpenChrom is a software application to edit and analyze mass spectrometric chromatographic data. It is extensible in many different ways, depending on the demands of the users or the analytical procedures and algorithms. It offers a customizable graphical user interface. -
Tailoring PMD to Secure Coding
Tailoring PMD to Secure Coding Markus Aderhold Artjom Kochtchi Technische Universit¨at Darmstadt, Germany Modeling and Analysis of Information Systems Technical Report TUD-CS-2013-0245 September 2013 Abstract In this report, we investigate how PMD can be tailored to check Java code with respect to secure coding guidelines. We chose PMD among four publicly available tools for the static analysis of Java code: FindBugs, Hammurapi, Jlint, and PMD. First, we describe our selection process, which includes an overview of these four tools with a focus on their archi- tecture, their functionality, and their intended application areas. Second, we present an implementation of a so-called rule for PMD so that Java programs can be checked with respect to two secure coding guidelines from the CERT Oracle Secure Coding Standard for Java. Contents 1 Introduction2 2 Tool Selection2 2.1 FindBugs...............................3 2.2 Hammurapi..............................7 2.3 Jlint.................................. 10 2.4 PMD.................................. 13 2.5 Choosing a Tool........................... 17 3 Secure Coding with PMD 18 3.1 Introduction to IDS07-J....................... 18 3.2 Elaboration on IDS07-J....................... 19 3.3 Implementation of a Rule for IDS07-J............... 21 3.4 Generalization to IDS03-J...................... 25 3.5 Example of a Data Sanitization................... 25 3.6 Case Study.............................. 26 3.7 Future Work............................. 28 4 Conclusion 29 References 30 1 1 Introduction Secure coding guidelines describe good programming practices that support de- velopers in improving the quality of code so that the resulting software is more secure. Determining whether some given code actually complies with secure coding guidelines easily becomes non-trivial, especially if the code consists of thousands of lines of code. -
Introduction to Yasca
Introduction To Yasca Presented at NYPHP 24 February 2009 Michael V. Scovetta Agenda . Who Am I? . What is Yasca? . How does it work? . Requirements . How should I use it? . The Future of Yasca . Demonstration . Questions? 2 Who Am I? . Development . CA ~2002 . Perl, Java, PHP . Information Security . UBS ~2005 . Security Consulting . Cigital ~2008 . Architecture . CA ~2008 3 What is Yasca? . Yasca started as a set of perl scripts that grepped through source code looking for XSS vulnerabilities. <%=request.getParameter("foo")%> . <?=$_REQUEST["foo"]?> . Then I needed to do multi-line searches: . String s = request.getParameter("foo"); out.println(s); . As I wrote more rules, I found other scanners that already had many of them. So I made calls out to them. Then everything got nasty and I wrote it all from scratch again in PHP. 4 What is Yasca? . Yasca is an open-source tool that can help you analyze program source code. It leverages several static analysis tools. PMD (http://pmd.sourceforge.net/) . J-Lint (http://artho.com/jlint/) . Pixy (http://pixybox.seclab.tuwien.ac.at/pixy/) . FindBugs (http://findbugs.sourceforge.net/) . It can be used to scan virtually any file type, not only traditional source code. Yasca is written in command-line PHP and released under the BSD license. 5 How Does it Work? . Architecture based on plug-ins. "Major Plug-in" => calls another tool to do the scan . e.g. PMD, J-Lint, FindBugs, Pixy, Grep . "Minor Plug-in" => uses embedded logic . Relatively easy to write, extremely flexible Report Plug-in Yasca Plug-in Generator Plug-in Output /tmp/my_source_code 6 How Does it Work . -
Developing Java™ Web Applications
ECLIPSE WEB TOOLS PLATFORM the eclipse series SERIES EDITORS Erich Gamma ■ Lee Nackman ■ John Wiegand Eclipse is a universal tool platform, an open extensible integrated development envi- ronment (IDE) for anything and nothing in particular. Eclipse represents one of the most exciting initiatives hatched from the world of application development in a long time, and it has the considerable support of the leading companies and organ- izations in the technology sector. Eclipse is gaining widespread acceptance in both the commercial and academic arenas. The Eclipse Series from Addison-Wesley is the definitive series of books dedicated to the Eclipse platform. Books in the series promise to bring you the key technical information you need to analyze Eclipse, high-quality insight into this powerful technology, and the practical advice you need to build tools to support this evolu- tionary Open Source platform. Leading experts Erich Gamma, Lee Nackman, and John Wiegand are the series editors. Titles in the Eclipse Series John Arthorne and Chris Laffra Official Eclipse 3.0 FAQs 0-321-26838-5 Frank Budinsky, David Steinberg, Ed Merks, Ray Ellersick, and Timothy J. Grose Eclipse Modeling Framework 0-131-42542-0 David Carlson Eclipse Distilled 0-321-28815-7 Eric Clayberg and Dan Rubel Eclipse: Building Commercial-Quality Plug-Ins, Second Edition 0-321-42672-X Adrian Colyer,Andy Clement, George Harley, and Matthew Webster Eclipse AspectJ:Aspect-Oriented Programming with AspectJ and the Eclipse AspectJ Development Tools 0-321-24587-3 Erich Gamma and