GCJ
http://gcc.gnu.org/java/
Jikes
http://oss.software.ibm.com/developerworks/opensource/jikes/if you mean a compiler's compiler ,then
javaCC,antlr are both ok
http://gcc.gnu.org/java/
Jikes
http://oss.software.ibm.com/developerworks/opensource/jikes/if you mean a compiler's compiler ,then
javaCC,antlr are both ok
http://www.cs.princeton.edu/~appel/modern/java/CUP/