Could not write JSON: (was java.lang.NullPointerException)；
Could not write JSON: (was java.lang.NullPointerException); nested exception is com.fasterxml.jackson.databind.JsonMappingException: java後臺沒有報錯，postman測試時出現了500錯誤 「Could not write JSON: (was java.lang
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- 1. Could not write JSON document: (was java.lang.NullPointerException) (through reference chain
- 2. org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON
- 3. 報錯信息：Could not write JSON: (was java.lang.NullPointerException)； nested exception is com.fasterxml.j
- 4. Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazy
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