Spring MVC + AngularJs: JSON/Model values set to null - angularjs

Question

I am trying submit json data to a Spring MVC controller mapped with a model. Instead of getting the json values, the values of the fields of the model are all NULL.
IDE debugger:
Chrome:
Exception:
org.springframework.dao.InvalidDataAccessApiUsageException: The given id must not be null!; nested exception is java.lang.IllegalArgumentException: The given id must not be null!
Controller:
#RequestMapping(value = "/update", method = RequestMethod.POST)
#ResponseBody
public PostResponse update(Setting setting, BindingResult bindingResult) {
return settingService.processUpdate(setting, bindingResult, messageSource);
}
JSON data:
{
"updatedAt":1460600207000,
"id":1,
"createdBy":null,
"description":"This is a setting",
"code":"MY_SETTING",
"value":"{\"id\":\"1018\",\"title\":\"Another setting\",\"code\":\"220-203-10-101\"}"
}
Model:
#Entity
#JsonIgnoreProperties(ignoreUnknown = true)
public class Setting {
#Id
#GeneratedValue
#Column
private Integer id;
#Column(unique = true)
private String code;
#Column
private String description;
#Column
private String value;
#Temporal(TemporalType.TIMESTAMP)
#Column(nullable = false)
private Date createdAt;
#Temporal(TemporalType.TIMESTAMP)
#Column(nullable = false)
private Date updatedAt;
#NotFound(action = NotFoundAction.IGNORE)
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="FK_createdByUserId")
private User createdBy;
public Setting() {}
public Setting(String code, String description, String value, Date createdAt, Date updatedAt, User createdBy) {
this.code = code;
this.description = description;
this.value = value;
this.createdAt = createdAt;
this.updatedAt = updatedAt;
this.createdBy = createdBy;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public Date getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(Date updatedAt) {
this.updatedAt = updatedAt;
}
public User getCreatedBy() {
return createdBy;
}
public void setCreatedBy(User createdBy) {
this.createdBy = createdBy;
}

Answer 1

I guess that the setting bean is not mapped at all.
You need to tell spring how to map the http request to the method arguments. If you're posting data, the best way is to add #RequestBody annotation to the relevant method argument (setting in your case)
Modify your controller method like this:
#RequestMapping(value = "/update", method = RequestMethod.POST)
#ResponseBody
public PostResponse update(#RequestBody Setting setting, BindingResult bindingResult) {
return settingService.processUpdate(setting, bindingResult, messageSource);
}