Java (île) | EPFL Graph Search

Java, en indonésien Jawa, Djawa jusqu'à la réforme orthographique de 1972, est une île du Sud-Ouest de l’Indonésie faisant partie de l'Insulinde, baignée à l'ouest et au nord par la mer de Java, à l'est par la mer de Bali et au sud par l'océan Indien . Elle est entourée par les îles de Sumatra au nord-ouest, Bali à l'est et Bornéo au nord. Son nom viendrait du sanskrit Javadvipa, « l'île du millet ». C'est sous ce nom que l'île est en effet désignée dans l'épopée indienne du Ramayana (écrite entre le et le ). Les ancêtres austronésiens des Javanais ont quitté les plaines alluviales du littoral de la Chine du Sud vers 3000 À cette époque, ils pratiquaient déjà la culture du millet. Ce n'est que plus tard que la culture du riz aurait été introduite à Java. L'ethnologue Louis Berthe attribue le développement des royaumes centralisés de Java au au développement de la riziculture irriguée. À ce jour, l'archéologie n'a encore rien pu démontrer concernant le passage du millet au riz à J

Optimizing Java on Truffle

Ekaterina Goltsova

Java on Truffle is an early-stage implementation of a Java Virtual Machine in Java. So far its development has focused on compatibility and functionality, not addressing performance in a systematic way. This thesis presents a series of experiments on Java on Truffle performance, namely adding Class Hierarchy Analysis, improving receiver profiling at callsites of virtual and interface methods, splitting methods per-callsite, delaying the collection of profiling information, and investigating and improving System.arraycopy performance.

2022

A Side-by-Side Comparison of Exception Handling in Ada and Java

Stanislav Chachkov

The purpose of this paper is to compare the exception handling mechanisms of Ada and Java. In order to be intelligible and useful to both communities, we have tried not get into specific technical intricacies of the languages, perhaps sometimes at the cost of precision. On the other side, we decided to use the language-specific terminology whenever we write about it. We believe that the contrary would often lead to misunderstandings: the same term sometimes covers two different concepts, e.g. object, or when the concepts are basically the same, the features provided by the language are largely different, making any unification impossible, e.g. task in Ada and thread Java.

ACM Press2001

Secure Computing with the MPEG RVC Framework

Junaid Jameel Ahmad, Marco Mattavelli, Richard Thavot

Recently, ISO/IEC standardized a dataflow-programming framework called Reconfigurable Video Coding (RVC) for the specification of video codecs. The RVC framework aims at providing the specification of a system at a high abstraction level so that the functionality (or behavior) of the system become independent of implementation details. The idea is to specify a system so that only intrinsic features of the algorithms are explicitly expressed, whereas implementation choices can then be made only once specific target platforms have been chosen. With this system design approach, one abstract design can be used to automatically create implementations towards multiple target platforms. In this paper, we report our investigations on applying the methodology standardized by the MPEG RVC framework to develop secure computing in the domains of cryptography and multimedia security, leading to the conclusion that the RVC framework can successfully be applied as a general-purpose framework to other fields beyond multimedia coding. This paper also highlights the challenges we faced in conducting our study, and how our study helped the RVC and the secure computing communities benefited from each other. Our investigations started with the development of a Crypto Tools Library (CTL) based on RVC, which covers a number of widely used ciphers and cryptographic hash functions such as AES, Triple DES, ARC4 and SHA-2. Performance benchmarking results on the RVC-based AES and SHA-2 implementations in both C and Java revealed that the automatically generated implementations can achieve a comparable performance to some manually-written reference implementations. We also demonstrated that the RVC framework can easily produce implementations with multi-core support without any change to the RVC code. A security protocol for mutual authentication was also implemented to demonstrate how one can build heterogeneous systems easily with RVC. By combining CTL with Video Tool Library (a standard library defined by the RVC standard), a non-standard RVC-based H.264/AVC encoder and a non-standard RVC-based JPEG codec, we further demonstrated the benefits of using RVC to develop different kinds of multimedia security applications, which include joint multimedia encryption-compression schemes, digital watermarking and image steganography in JPEG compressed domain. Our study has shown that RVC can be used as a general-purpose implementation-independent development framework for diverse data-driven applications with different complexities.

Elsevier Science Bv2013

Secure Computing with the MPEG RVC Framework

Junaid Jameel Ahmad, Marco Mattavelli, Richard Thavot

Elsevier Science Bv2013