Perhaps it's normal, but can't (due to maven) check with 5.4 version. This query is not really complicated, and we've got a lot of more complex query to handle. I don't found in the doc/sample any ...

A from-scratch syntax analyzer for a defined subset of the Java language. This parser validates the syntactic correctness of a token stream and, upon success, constructs a concrete parse tree ...

Now, it's time to discuss a few techniques to improve the overall design of the parser. I'll cover performance, general structure and what can be done to considerably ...