spring-data-jpa-guide
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Published
20 hours ago •
zhangzhenhuajack
zhangzhenhuajack
JPA不推荐使用List<Map<String,Object>>作为响应结果
老铁们，写自定义QSL的时候，如果不写后面的as xxx，会报JSON NULL无法转换，与字段内容无关，字段都是有值的，是少写了什么东西吗
Map的key为NULL所以报错，打印了一下，确实都是NULL，本意是想把字段名当成key，字段值当成value。
如果加了as xxx就没问题
Resolved [org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?) (through reference chain: java.util.ArrayList[0]->org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap["null"])]
