javacc "outOfMemoryError"

I am getting an "OutOfMemoryError" when I run javacc on a certain
grammar.  The grammar was originally defined with a left recursion. 
Since javacc does not allow left recursion, I converted the grammar
definition to contain a right recursion instead.  Could this be
causing the problem?  How can I solve the problem?  Thanks

pd: I've tried also to execute javacc with the parameters -Xms and
-Xmx but i've get no result. Thanks again