GraalVM is a new Java Development Kit developed by Oracle that promises improved performance when running Java programs. In this paper we compare the performance of both the community edition and the enterprise edition of GraalVM to OpenJDK and OracleJDK, using both Java 8 and Java 11. We use the DaCapo benchmark suite to test these JDKs. The results are analysed using statistically rigorous methodology. We find that the performance of the different JDKs vary significantly depending on the benchmark, making it difficult to draw any definitive conclusions.In the end we can see that GraalVM Enterprise Edition using Java 8 will outperform the other JDKs tested in the majority of cases.

The first objective of this paper is to describe the Android operating system. The chapter presents history and architecture regarding to all versions of the operating system. The significant part of chapter is focused on security. The second main topic of this paper is analysing the NFC (Near Field Communication) technology. This technology is based on an older contactless system RFID (Radio Frequency Communication), so RFID is described either. The NFC technology chapter contains the description of usability, history and the definitions of physical layer, link layer and NDEF (NFC Data Exchange) data format, used for data transmitting. The next chapter is focusing on the analysis of the NFC vulnerability. It contains a possible attacks methods and solutions how to prevent them. The output of this paper is the projection and creation of an application, which allow sending an arbitrary data between two devices using the NFC technology. Additional Bluetooth technology can be used for larger files. In this case, NFC helps to create Bluetooth communication channel which is utilized for data transfer.