デフォルトコンストラクタ呼び出し時のDate date = newDate()でnewDate()が呼ばれた時にcurrentがnullだから落ちてるのか…ってなんでcurrentがnullなんだろ…
— とーますさん (@grimrose) 2013年1月27日
GroovyのmetaClassを使ってみたコードはこちら
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