[英]JSON parse error: Cannot deserialize instance of `java.util.ArrayList`
[英]JSON parse error: Cannot deserialize instance of ArrayList
我正在嘗試將 JSON 發送到 POST bodyRequest 服務,以將此信息用作 Java ArrayList 或類似的東西。 當我嘗試這樣做時,我收到一個反序列化錯誤
這是我的 JSON:
{信息:[ {字段:“提供的期間”,表格:“課程”,列:“學術水平*”},{字段:“默認評分基礎*”,表格:“課程”,列:“默認提供百分比” }, {fields: "Allowed Locations", tables: "Courses", columns: "Allowed to Offer"} ] }
這是我的 POST bodyRequest 服務
@ResponseBody
@PostMapping("/dataMapping/update/table")
public ResponseEntity<Object> updateDataMappingTable(@RequestBody List<UpdateDataMapping> information) {
try {
String update = this.dataMappingService.update(information);
return new ResponseEntity<Object>(update, HttpStatus.OK);
} catch (Exception e) {
Response response = new Response();
response.setError(e.getMessage());
return new ResponseEntity<Object>(response, HttpStatus.OK);
}
}
我的 UpdateDataMapping class 看起來像:
public class UpdateDataMapping {
public String fields;
public String tables;
public String columns;
public UpdateDataMapping() {
}
public UpdateDataMapping(String fields, String tables, String columns) {
this.fields = fields;
this.tables = tables;
this.columns = columns;
}
public String getFields() {
return fields;
}
public void setFields(String fields) {
this.fields = fields;
}
public String getTables() {
return tables;
}
public void setTables(String tables) {
this.tables = tables;
}
public String getColumns() {
return columns;
}
public void setColumns(String columns) {
this.columns = columns;
}
}
這是我的錯誤:
.wsmsDefaultHandlerExceptionResolver: Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of
java.util.ArrayList<com.kastech.model.UpdateDataMapping>
out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance ofjava.util.ArrayList<com.kastech.model.UpdateDataMapping>
out of START_OBJECT token at [Source: (PushbackInputStream); 行:1,列:1]]
如果有人可以幫助我,我將不勝感激。
您的 JSON 示例顯示您的陣列在information
object 內交付。 您正在查看當前堆棧跟蹤,因為 Jackson 無法找到反序列化您的請求負載的適當方法。
或者,您可以將您的請求 JSON 更改為簡單的列表
[ {fields: "Periods Offered", tables: "Courses", columns: "Academic Level*"}, {fields: "Default Grading Basis*", tables: "Courses", columns: "Default Offering Percentage"}, {fields: "Allowed Locations", tables: "Courses", columns: "Allowed to Offer"} ]
或者您可以讓 POJO 代表該information
object
class UpdateMappingList {
List<UpdateDataMapping> information;
...
}
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