Java Faqs - What language is the Java compiler and JVM written in?

Sun's javac Java compiler is written in Java. Sun's java JVM interpreter is written in Java with some C, C++ forplatform-specific and low level routines.Sun's Java Web Server is written in Java.Other companies have chosen other approaches. IBM's Jikes compiler (which is praised for its speed) is written in C++, but of course each version only runs on one platform. Jikes versions have been prepared for IBM AIX, Linux Intel (glibc), Win95/NT and Solaris Sparc at http://www.alphaworks.ibm.com/formula/jikes.