報錯信息：Could not write JSON: (was java.lang.NullPointerException)； nested exception is com.fasterxml.j
記錄一次spring boot整合layui加security查詢List接口返回接口異常報錯 實現了UserDetails接口 Mapper接口 前臺直接注入Mapper然後調用接口 後臺一切運行正常然後到前臺報一個500，報錯信息如下 {timestamp: 「2020-09-21T07:02:23.328+00:00」, status: 500, error: 「Internal Serve
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- 1. Could not write JSON: (was java.lang.NullPointerException)；
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