This limitation is a pure JVM limitation that does not support a static initializer code greater than 64K. While a grammar can produces with antlr3 relatively small DFAs, the cumulated size of each DFAs static initializer within a single parser/lexer class can overpass the 64k limitation.
One solution is to extract all DFAs from the main parser or lexer classes and put them into a separate directory namely
If your are using a SharedState for your grammar, you should add its type in the options block as
The patch for applying this technique is delivered by the 2 joined jars antlr-3.4.1-SNAPSHOT.jar and antlr-runtime-3.4.1-SNAPSHOT.jar
This is not an official patch, nor it has been approved by Terr. So if you like it while it solve the 64k syndrome for your grammar... just push it to the dictator...