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2 Annals of Computer Science and Information Systems

2 2019

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Search for the memory duplicities in the Java applications using shallow and deep object comparison

Lipka Richard, Potuzak Tomas

Annals of Computer Science and Information Systems

2019

Vol. 18

781--789

In high-level object languages, such as Java, a problem of unnecessary duplicates of instances can easily appear. Although there can be a valid reason for maintaining several clones of the same data in the memory, often it indicates that the application can be refactored into a more efficient one. Unnecessary instances consume memory, but in case of Java applications can also have a significant impact on the application performance, as they might prolong the time needed for the garbage collection. In this paper, we are presenting a method and a tool that allows detecting duplicity in the heap dump of a Java application, based on the shallow and deep object comparison. The tool allows to identify the problematic instances in the memory and thus helps programmers to create a better application. On several case studies, we also demonstrate that the duplicates appear not only in the student projects and similar programs that often suffer from poor maintenance but also in commonly available Java tools and frameworks.

Malicious and harmless software in the domain of system utilities

Šťastná Jana

Annals of Computer Science and Information Systems

2019

Vol. 18

237--246

The focus of malware research is often directed on behaviour and features of malicious samples that stand out the most. However, our previous research led us to see that some features typical for malware may occur in harmless software as well. That finding guided us to direct more attention towards harmless samples and more detailed comparisons of malware and harmless software properties. To eliminate variables that may influence the results, we narrowed down our research study to specific software domain - system maintenance and utility tools. We analysed 100 malicious and 100 harmless samples from this domain and statistically evaluated how they differ regarding packing, program sections and their entropies, amount of code outside common sections and we also looked at differences in behaviour from the high-level view.