Cannot deserialize instance of a HashSet

huangapple
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英文:

Cannot deserialize instance of a HashSet

问题

我创建了这个Json对象：

  1. {
  2.    "firstName":"John",
  3.    "organizations":[
  4.       {
  5.          "name":"ACME inc.",
  6.          "sector":{
  7.             "sectors":{
  8.                "name":"Technologies vertes"
  9.             }
  10.          }
  11.       }
  12.    ]
  13. }

这个Json对象应该与以下模型类匹配：

  1. @Getter @Setter
  2. public class UserDetailsRequestModel {
  3.     private String firstName;
  4.     private Set<OrganizationRequestModel> organizations;
  5. }
  7. @Getter @Setter
  8. public class OrganizationRequestModel {
  9.     private String name;
  10.     private SectorRequestModel sector;
  11. }
  13. @Getter @Setter
  14. public class SectorRequestModel {
  15.     private Set<SectorLangRequestModel> sectors;
  16. }
  18. @Getter @Setter
  19. public class SectorLangRequestModel {
  20.     private String name;
  21. }

对于我的REST API，我为用户创建创建了一个UserController：

  1. public UserRestResponseModel createUser(@RequestBody UserDetailsRequestModel userDetails) {
  2.     log.info("createUser() called");
  3.     UserRestResponseModel returnValue;
  5.     ModelMapper modelMapper = new ModelMapper();
  6.     modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
  7.     UserDto userDto = modelMapper.map(userDetails, UserDto.class);
  9.     UserDto createdUser = userService.createUser(userDto);
  10.     returnValue = modelMapper.map(createdUser, UserRestResponseModel.class);
  11.     return returnValue;
  12. }

在我添加了sector字段之后，我的用户创建正常工作。即使使用调试器，我仍然得到一个错误消息：

  1. JSON parse error: Cannot deserialize instance of `java.util.HashSet<eu.valoreo.app.ui.model.request.obj.SectorLangRequestModel>` out of START_OBJECT token; nested exception is
  2. com.fasterxml.jackson.databind.exc.MismatchedInputException
  3. at [Source: (PushbackInputStream); line: 31, column: 23] (through reference chain: eu.valoreo.app.ui.model.request.UserDetailsRequestModel["organizations"]->java.util.HashSet[0]->eu.valoreo.app.ui.model.request.obj.OrganizationRequestModel["sector"]->eu.valoreo.app.ui.model.request.obj.SectorRequestModel["sectors"])]

我真的不明白问题出在哪里。我的Json对象看起来是正确的。

英文:

I created this Json object:

  1. {
  2.    &quot;firstName&quot;:&quot;John&quot;,
  3.    &quot;organizations&quot;:[
  4.       {
  5.          &quot;name&quot;:&quot;ACME inc.&quot;,
  6.          &quot;sector&quot;:{
  7.             &quot;sectors&quot;:{
  8.                &quot;name&quot;:&quot;Technologies vertes&quot;
  9.             }
  10.          }
  11.       }
  12.    ]
  13. }

This Json object should match with those model classes :

  1. @Getter @Setter
  2. public class UserDetailsRequestModel {
  3.     private String firstName;
  4.     private Set&lt;OrganizationRequestModel&gt; organizations;
  5. }

My OrganizationRequestModel class :

  1. @Getter @Setter
  2. public class OrganizationRequestModel {
  3.     private String name;
  4.     private SectorRequestModel sector;
  5. }

My SectorRequestModel:

  1. @Getter @Setter
  2. public class SectorRequestModel {
  3.     private Set&lt;SectorLangRequestModel&gt; sectors;
  4. }

Finally :

  1. @Getter @Setter
  2. public class SectorLangRequestModel {
  3.     private String name;
  4. }

For my rest API, i created a UserController for user creation:

  1. public UserRestResponseModel createUser(@RequestBody UserDetailsRequestModel userDetails) {
  2.     log.info(&quot;createUser() called&quot;);
  3.     UserRestResponseModel returnValue;
  5.     ModelMapper modelMapper = new ModelMapper();
  6.     modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
  7.     UserDto userDto = modelMapper.map(userDetails, UserDto.class);
  9.     UserDto createdUser = userService.createUser(userDto);
  10.     returnValue = modelMapper.map(createdUser, UserRestResponseModel.class);
  11.     return returnValue;
  12. }

My user creation was working fine until I added the sector. Even with debugger I obtain an error message:

  1. JSON parse error: Cannot deserialize instance of `java.util.HashSet&lt;eu.valoreo.app.ui.model.request.obj.SectorLangRequestModel&gt;` out of START_OBJECT token; nested exception is
  2. com.fasterxml.jackson.databind.exc.MismatchedInputException
  3. at [Source: (PushbackInputStream); line: 31, column: 23] (through reference chain: eu.valoreo.app.ui.model.request.UserDetailsRequestModel[&quot;organizations&quot;]-&gt;java.util.HashSet[0]-&gt;eu.valoreo.app.ui.model.request.obj.OrganizationRequestModel[&quot;sector&quot;]-&gt;eu.valoreo.app.ui.model.request.obj.SectorRequestModel[&quot;sectors&quot;])]

I don't really understand where is the problem. My Json object looks correct

答案1

得分: 2

好的，以下是您要翻译的内容：

似乎我的 JSON 不正确：

  1. "sector": {
  2.    "sectors": [{
  3.        "name": "Technologies vertes"
  4.     }]
  5. }
英文:

It seems that my Json was not correct:

  1. &quot;sector&quot;:{
  2.    &quot;sectors&quot;:[{
  3.        &quot;name&quot;:&quot;Technologies vertes&quot;
  4.     }]
  5. }

huangapple
  • 本文由 发表于 2020年10月26日 08:18:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/64530131.html
  • java
  • json
  • spring-boot
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