Cannot deserialize instance - spring-boot

Question

I have a problem. I am using Spring Boot and sqlite3 DB. I tried to send data to the DB.
When I sent data to the DB I have this error:
{
"timestamp": "2019-02-12T12:39:40.413+0000",
"status": 400,
"error": "Bad Request",
"message": "JSON parse error: Cannot deserialize instance of `com.dar.darkozmetika.models.CategoryModel` out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.dar.darkozmetika.models.CategoryModel` out of START_ARRAY token\n at [Source: (PushbackInputStream); line: 1, column: 1]",
"path": "/api/cateogry/dar"
}
This is my controller:
RestController
#RequestMapping("api/cateogry/dar")
public class CategoryController {
#Autowired
private CategoryRepository categoryRepository;
#GetMapping
private List<CategoryModel> getAllCategory (){
System.out.println("sadad");
System.out.println("sadad" + this.categoryRepository.findAll());
return this.categoryRepository.findAll();
}
#PostMapping
#ResponseStatus(HttpStatus.OK)
public void create(#RequestBody CategoryModel bike) {
categoryRepository.save(bike);
}
#GetMapping("/{id}")
public CategoryModel getSpecificCategory(#PathVariable("id") long id) {
return null;//categoryRepository.getOne(id);
}
}
This is my model:
#Entity
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class CategoryModel {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String categoryName;
private String categoryDescription;
private String imagePath;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getCategoryName() {
return categoryName;
}
I sent this data from Postman:
[
{
"id": 2,
"categoryName": "dsds",
"categoryDescription": "sdsd",
"imagePath": "Jsdsds"
}
]
Very interesting, I can get data from the DB without problems. This is return form my DB.
[
{
"id": 1,
"categoryName": "jeff#bikes.com",
"categoryDescription": "Globo MTB 29 Full Suspension",
"imagePath": "Jeff Miller"
}
]

Answer 1

Your request is not ok, you are sending an array of CategoryModel and the POST api/cateogry/dar receives just a CategoryModel. You should send just:
{
"id": 2,
"categoryName": "dsds",
"categoryDescription": "sdsd",
"imagePath": "Jsdsds"
}