Main goal of Java Profiling Tool project is to develop fast and fully functional Java profiler module using experimental JDK's JVMPI interface. End part of project (and for most people the main one) is a profiler GUI plug-in for Forte4j development environment. It uses functions of special dynamic profiling library which is ported to Microsoft Windows 9x/NT/2000 operating systems, Linux and SunOS 7/8. The rest of package (including client side of communication interface and GUI plug-in) is developed in Java and that's why it is fully portable to all named operating systems.