JavaCC Generates Dead Code

I'm using JavaCC for the first time and I'm noticing it's generating a lot of dead code. There are many lines that look like (pardon the spacing, it's automatic):

{if ("" != null) return result;}
    throw new Error("Missing return statement in function");
  }

Is it possible to avoid generating this dead code? It causes tens of compiler warnings that are hopefully avoidable.

Thanks!

Here's a full minimal example from the .jj file:

Statement UseStatement():
{
    String dbName;
}
{
    <USE> dbName=DbObjectName()
    {
        return new UseStatement(dbName);
    }
}

Which generates:

final public Statement UseStatement() throws ParseException {String dbName;
    jj_consume_token(USE);
    dbName = DbObjectName();
{if ("" != null) return new UseStatement(dbName);}
    throw new Error("Missing return statement in function");
  }

Additionally JavaCC is generating a ParserTokenManager file which throws a TokenMgrError - but the code doesn't compile. It declares a protected int curChar where it should declare it a char. Googling this phrase shows many examples where it is correctly declared a char - is this just a lot of people hand-editing the result?