Radio Frequency Identification (RFID) is generic term for technology employing radio waves for detecting objects. RFID has wide application in payment systems, access control, asset tracking and other areas as many companies are using and developing the technology's potential. As RFID develops, it imports some new elements, one of which is Java technology. Java now can be seen in any links from RFID tags to database centre. But the performance of Java is still a main concern to us. This paper shows a good solution to deal with the efficiency problem when using Java technology in RFID systems. It firstly introduces advantages of Java processor. It can highly increase the performance of processing Java applications by implementing the technology in ASIC. After introducing some Java processors both for research and commercial, this paper leads us to the newly developed Java processor VP6K. Then details of functions and performance about the VP6K core and chip will be discussed. This paper also provides a hardware verifying platform for VP6K processor, in order to show cases of applications. Test results will be listed. In the end, this paper comes to the conclusion that VP6K is a high performance Java-specific processor, and further research plan will be made.