bison - Java カップ: Shift/Reduce コンフリクト

Question

JFlex と Cup を使用してパーサーを作成しようとしていますが、次のような再帰的なプロパティ アクセスを使用した関数呼び出しのような再帰的なポイント表記法を扱う際に問題があります。

var x = obj.property1.functionCall(p1, p2).property2;

関連するパーサー定義は次のとおりです。

unary_exp ::= postfix_exp
              | ADD2 unary_exp
              | SUB2 unary_exp
              | unary_operator unary_exp;

unary_operator ::=  ADD
                    | SUB
                    | BIT_NOT
                    | NOT;

postfix_exp ::= primary_exp
                | postfix_exp LPAR_SQ right_value_exp RPAR_SQ
                | postfix_exp LPAR optional_postfix_exp_list RPAR
                | postfix_exp DOT postfix_exp
                | postfix_exp SUB2
                | postfix_exp ADD2;

primary_exp ::= BOOL
                | STRING
                | INTEGER
                | NUMBER
                | NULL;

次のシフト/削減の競合が発生しました:

Warning : *** Shift/Reduce conflict found in state #190
  between postfix_exp ::= postfix_exp DOT postfix_exp (*) 
  and     postfix_exp ::= postfix_exp (*) LPAR optional_postfix_exp_list RPAR 
  under symbol LPAR
  Resolved in favor of shifting.

Warning : *** Shift/Reduce conflict found in state #190
  between postfix_exp ::= postfix_exp DOT postfix_exp (*) 
  and     postfix_exp ::= postfix_exp (*) LPAR_SQ right_value_exp RPAR_SQ 
  under symbol LPAR_SQ
  Resolved in favor of shifting.

Warning : *** Shift/Reduce conflict found in state #190
  between postfix_exp ::= postfix_exp DOT postfix_exp (*) 
  and     postfix_exp ::= postfix_exp (*) DOT postfix_exp 
  under symbol DOT
  Resolved in favor of shifting.

Warning : *** Shift/Reduce conflict found in state #190
  between postfix_exp ::= postfix_exp DOT postfix_exp (*) 
  and     postfix_exp ::= postfix_exp (*) ADD2 
  under symbol ADD2
  Resolved in favor of shifting.

Warning : *** Shift/Reduce conflict found in state #190
  between postfix_exp ::= postfix_exp DOT postfix_exp (*) 
  and     postfix_exp ::= postfix_exp (*) SUB2 
  under symbol SUB2
  Resolved in favor of shifting.

Error : *** More conflicts encountered than expected -- parser generation aborted

これらの競合に対処する方法や、Java cup、yacc、または bison を使用した実際の例がどこにあるかを誰かが説明してくれませんか?