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检索条件"主题词=Java programming language"

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Effect of clone information on the performance of developers fixing cloned bugs 14

Effect of clone information on the performance of developers...

引用

14th IEEE International Working Conference on Source Code Analysis and Manipulation (SCAM)

作者： Bazrafshan, Saman Koschke, Rainer Univ Bremen D-28359 Bremen Germany

ISBN: (纸本)9780769553047

Duplicated source code-clones-is known to occur frequently in software systems and bears the risk of inconsistent updates of the code. The impact of clones has been investigated mostly by retrospective analysis of software systems. Only little effort has been spent to investigate human interaction when dealing with clones. A previous study by Chatterji and colleagues found that cloned defects are removed significantly more accurately when clone information is provided to the programmers. We conducted a controlled experiment to extend the previous study on the use of clone information by investigating the effect of clone information on the performance of developers in common bug-fixing tasks. The experiment shows that developers are quite capable to compensate missing clone information through testing to provide correct solutions. Clone information does help to detect cloned defects faster, although developers may exploit semantic code relations such as inheritance to uncover cloned defects only slightly slower if they do not have clone information. If cloned defects lurk in semantically unrelated places however, clone information helps to find them faster at statistical significance. Developers without clone information needed 17 minutes longer on average or 140% more time in relative terms to complete the task successfully.

关键词： program debugging program testing source code (software) clone information effect cloned bugs fixing cloned defect detection duplicated source code missing clone information compensation software systems Cloning Games java Maintenance engineering Software systems Testing clone experiment clone management software clones software maintenance Software systems Developers Clone Cells Debugging Maintenance engineering program testing DEVELOPERS Software maintenance java java programming language Cloning

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A comparative study of two java high performance environments for implementing parallel iterative methods

引用

7th International Symposium on Advanced Parallel Processing Technologies

作者： Bahi, Jacques M. Couturier, Raphael Laiymani, David Mazouzi, Kamel IUT Belfort Montbeliard LIFC F-90016 Belfort France

ISBN: (纸本)9783540768364

This paper aims at studying two java high performance environments in order to implement parallel iterative methods on Grid infrastructures. We exhibit the important features offered by MPJ Express and Jace V2 to tackle the different issues linked to parallel iterative algorithms. Our study relies on the implementation of a typical iterative application: the multi-splitting method on a large scale grid platform.

关键词： java programming language

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Software Maintainability Benefits From Annotation-Driven Code

Software Maintainability Benefits From Annotation-Driven Cod...

引用

IEEE International Conference on Software Maintenance

作者： Nigul, Leho Mah, Ernest IBM Canada Laboratory Canada

ISBN: (纸本)9781424448975

java annotations and their predecessors XDoclet annotations are well positioned to offer a substantial benefit for developing and maintaining software by combining relevant metadata together with the code that makes use of them. In this paper we share the insights that we gained by developing the J2EE Connector Tools suite, which is part of IBM Rational Application Developer. This tools suite is used to generate annotated java code capable of connecting to Enterprise Information Systems through the java EE Connector APIs. The generated code is annotation driven, and in the paper we show how the annotations in the generated code helped us to achieve a high degree of efficient code maintenance for the tools that generate the code as well as for the generated code itself.

关键词： java programming language

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Expressing parallelism in java applications distributed on clusters

Expressing parallelism in Java applications distributed on c...

引用

NATO Advanced Research Workshop on Advanced Environments, Tools, and Applications for Cluster Computer

作者： Felea, V Devesa, N Toursel, B Lecouffe, P Univ Lille 1 UPRESA CNRS 8022 LIFL F-59655 Villeneuve Dascq France EUDIL Lille France IUTA Lille France

ISBN: (纸本)3540436723

java threads allow to express parallelism of a java application. However, integrating parallelism in the context of distributed object systems, namely in the java RMI context, raises problems at both conceptual and implementation levels. This article presents an useful tool, the distributed collection, which allows the expression of parallelism and an easy recovery of the results. The parallelism proposed associates the two approaches: the data parallelism, through fragmented data and the task parallelism using asynchronous calls. We show the interest of distributed collections, evaluating the facility in the conception of distributed and parallel java programs.

关键词： java programming language

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Using compressed bytecode traces for slicing java programs

Using compressed bytecode traces for slicing Java programs

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26th International Conference on Software Engineering (ICSE 2004)

作者： Wang, T Roychoudhury, A Natl Univ Singapore Sch Comp Singapore 117543 Singapore

ISBN: (纸本)0769521630

Dynamic slicing is a well-known program debugging technique. Given a program P and input I, it finds all program statements which directly/indirectly affect the values of some variables' occurrences when P is executed with L Dynamic slicing algorithms often proceed by traversing the execution trace of P produced by input I (or a dependence graph which captures control/data flow in the execution trace). Consequently, it is important to develop space efficient representations of the execution trace. In this paper we use results from data compression to compactly represent bytecode traces of sequential java programs. The major space savings come from the optimized representation of data (instruction) addresses used by memory reference (branch) bytecodes as operands. We give detailed experimental results on the space efficiency and time overheads for our compact trace representation. We then show how dynamic slicing algorithms can directly traverse our compact traces without resorting to costly decompression. We also develop an extension of dynamic slicing which allows us to explain omission errors (i.e. why some events did not happen during program execution).

关键词： java programming language

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Visualization of Specification Coverage: A Case Study of a Web Application Development in Industry 28

Visualization of Specification Coverage: A Case Study of a W...

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28th IEEE International Symposium on Software Reliability Engineering

作者： Nakagawa, Hiroyuki Hasegawa, Toshinobu Matsui, Shori Tsuchiya, Tatsuhiro Osaka Univ Grad Sch Informat Sci & Technol Osaka Japan SUNTORY Syst Technol Osaka Japan

ISBN: (纸本)9781538623879

Specifications for a software system are usually verified using test cases in the testing phase. As is code coverage, specification coverage is expected to help comprehend how many specifications to be implemented are tested. In this study, we apply a visualization process for specification coverage to a web application development project in industry. This process provides two views for visualization from different viewpoints. The process also provides a classification of specifications according to the assurance degree of test execution. The results of the case study demonstrate that the process provides effective measures to comprehend how many specifications are covered and discovers trends related to the project.

关键词： Visualization Testing Software java Industries Natural languages Companies Visualization natural languages Specifications industries Companies java java programming language computer software Case studies web applications Coverage Software systems Development projects

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Empirically Evaluating the Quality of Automatically Generated and Manually Written Test Suites 14

Empirically Evaluating the Quality of Automatically Generate...

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14th Annual International Conference on Quality Software (QSIC)

作者： Kracht, Jeshua S. Petrovic, Jacob Z. Walcott-Justice, Kristen R. Univ Colorado Dept Comp Sci Colorado Springs CO 80907 USA

ISBN: (纸本)9781479971978

The creation, execution, and maintenance of tests are some of the most expensive tasks in software development. To help reduce the cost, automated test generation tools can be used to assist and guide developers in creating test cases. Yet, the tests that automated tools produce range from simple skeletons to fully executable test suites, hence their complexity and quality vary. This paper compares the complexity and quality of test suites created by sophisticated automated test generation tools to that of developer-written test suites. The empirical study in this paper examines ten real-world programs with existing test suites and applies two state-of-the-art automated test generation tools. The study measures the resulting test suite quality in terms of code coverage and fault-finding capability. On average, manual tests covered 31.5% of the branches while the automated tools covered 31.8% of the branches. In terms of mutation score, the tests generated by automated tools had an average mutation score of 39.8% compared to the average mutation score of 42.1% for manually written tests. Even though automatically created tests often contain more lines of source code than those written by developers, this paper's empirical results reveal that test generation tools can provide value by creating high quality test suites while reducing the cost and effort needed for testing.

关键词： program testing software maintenance software metrics software quality source code (software) automated test generation tools automatically generated test suites average mutation score code coverage cost reduction empirical software quality evaluation fault-finding capability manually written test suites real-world programs software development software test creation software test execution software test maintenance test suite complexity test suite quality Complexity theory java Manuals Software Standards Testing Writing computer software Software design program testing Software maintenance Software measurement Complexity theory software quality COST REDUCTION Writing java java programming language Test generation Automation AUTOMATIC

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Selective profiling of java applications using dynamic bytecode instrumentation

Selective profiling of Java applications using dynamic bytec...

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IEEE International Symposium on Perfomance Analysis of Systems and Software

作者： Dmitriev, M Sun Microsyst Labs Mountain View CA 94303 USA

ISBN: (纸本)0780383850

Instrumentation-based profiling provides a number of benefits, but can also cause high performance overhead. The negative impact of this overhead could be mitigated considerably if only a small part of the target application (e.g. one that has previously been identified as a bottleneck) is instrumented, possibly for a short time only, while the rest of the application code runs at full speed. In this paper we present an experimental profiling system called JFluid, which includes a modified java(TM) VM and a GUI tool, and addresses both of the above issues. Our tool supports dynamic instrumentation of a group of methods defined as an arbitrary "root" method plus all methods that it calls (a call subgraph). Methods that belong to a call subgraph are revealed and instrumented lazily, to minimise the number of methods instrumented unnecessarily Measurements that we obtained when performing full and partial program profiling show that the overhead can be reduced substantially using this technique, and that it is more beneficial when used for large server side java applications as opposed to small benchmarks.

关键词： java programming language

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Pivot: Fast, Synchronous Mashup Isolation Using Generator Chains 35

Pivot: Fast, Synchronous Mashup Isolation Using Generator Ch...

引用

35th IEEE Symposium on Security and Privacy (SP)

作者： Mickens, James Microsoft Res Paris France

ISBN: (纸本)9781479946860

Pivot is a new javaScript isolation framework for web applications. Pivot uses iframes as its low-level isolation containers, but it uses code rewriting to implement synchronous cross-domain interfaces atop the asynchronous cross frame postMessage() primitive. Pivot layers a distributed scheduling abstraction across the frames, essentially treating each frame as a thread which can invoke RPCs that are serviced by external threads. By rewriting javaScript call sites, Pivot can detect RPC invocations;Pivot exchanges RPC requests and responses via postMessage(), and it pauses and restarts frames using a novel rewriting technique that translates each frame's javaScript code into a restartable generator function. By leveraging both iframes and rewriting, Pivot does not need to rewrite all code, providing an order of-magnitude performance improvement over rewriting-only solutions. Compared to iframe-only approaches, Pivot provides synchronous RPC semantics, which developers typically prefer over asynchronous RPCs. Pivot also allows developers to use the full, unrestricted javaScript language, including powerful statements like eval().

关键词： java Web sites program compilers rewriting systems javaScript call sites javaScript code javaScript isolation framework Pivot RPC invocations RPC requests Web applications asynchronous cross-frame postMessage() primitive code rewriting distributed scheduling abstraction eval() generator chains iframe-only approaches iframes low-level isolation containers order-of-magnitude performance improvement restartable generator function rewriting technique rewriting-only solutions synchronous cross-domain interfaces synchronous mashup isolation unrestricted javaScript language Browsers Generators Libraries Reactive power Runtime Satellites Security Pivot Device Component dynamos rewriting systems compilers web applications Browsers Runtime Reactive power satellites websites Earth Viewing Applications Laboratory java java programming language Libraries Generator

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Interrupt handlers in java

Interrupt handlers in Java

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11th IEEE Symposium on Object/Component/Service-Oriented Real-Time Distributed Computing

作者： Korsholm, Stephan Schoeberl, Martin Ravn, Anders P. Aalborg Univ Dept Comp Sci DK-9220 Aalborg Denmark Vienna Univ Tech Inst Comp Engn Vienna Austria Aalborg Univ Dept Comp Sci DK-9220 Aalborg Denmark

ISBN: (纸本)9780769531328

An important part of implementing device drivers is to control the interrupt facilities of the hardware platform and to program interrupt handlers. Current methods for handling interrupts in java use a server thread waiting for the VM to signal an interrupt occurrence. It means that the interrupt is handled at a later time, which has some disadvantages. We present constructs that allow interrupts to be handled directly and not at a later point decided by a scheduler. A desirable feature of our approach is that we do not require a native middelware layer but can handle interrupts entirely with java code. We have implemented our approach using an interpreter and a java processor, and give an example demonstrating its use.

关键词： java programming language

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