解決nested exception is java.lang.IllegalArgumentException: No converter found for return value of typ

@SpringMVC #hahahahha 解決nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList錯誤 這個問題困擾了我一天，返回String類型是好使的，返回集合或對象是就報錯了，百度上大部分回答

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