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@onigrainClassi株式会社

jdk8でjava.util.concurrent.ConcurrentHashMap.keySet()がjava.lang.NoSuchMethodErrorになる

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Java8で ConcurrentHashMap#keySet() の戻り値が変わって互換性が無くなったので、jdk8でコンパイルは通るけど実行時にエラーになることがある。

バージョンアップに合わせてコード修正するか、jdk7でコンパイルしよう。

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