問題は、join関数がJSON仕様の文字列を返すことです...ここのドキュメントによると:http://grails.org/doc/1.0.3/api/org/codehaus/groovy/grails/web/json /JSONArray.html
The texts produced by the toString methods strictly conform to JSON syntax rules. The constructors are more forgiving in the texts they will accept:
An extra , (comma) may appear just before the closing bracket.
The null value will be inserted when there is , (comma) elision.
Strings may be quoted with ' (single quote).
Strings do not need to be quoted at all if they do not begin with a quote or single quote, and if they do not contain leading or trailing spaces, and if they do not contain any of these characters: { } [ ] / \ : , = ; # and if they do not look like numbers and if they are not the reserved words true, false, or null.
Values can be separated by ; (semicolon) as well as by , (comma).
Numbers may have the 0- (octal) or 0x- (hex) prefix.
Comments written in the slashshlash, slashstar, and hash conventions will be ignored.
「文字列が引用符または一重引用符で始まらない場合は、文字列を引用符で囲む必要はありません」というルールが発生していることに注意してください。文字列は引用符で始まるため、引用符なしで出力された場合、JSONパーサーは文字列が2番目の単一引用符で終了したと見なし、その後のテキストは解析できないガベージになります。