How #RequestBody works - spring

Question

How to get more details:
I am doing simple rest post request from Postman chrome extension.
My controller is :
#Controller
#RequestMapping("/theme")
public class ThemeController {
#RequestMapping(value = "/create", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
public #ResponseBody
Status addTheme(#RequestBody Theme theme) {
try {
themeServices.addEntity(theme);
return new Status(1, "Theme added Successfully !");
} catch (Exception e) {
// e.printStackTrace();
return new Status(0, e.toString());
}
}
In Theme.java:
#Entity
#Table(name = "theme", uniqueConstraints = { #UniqueConstraint(columnNames = { "theme_id" }) })
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
#NamedQuery(name = "Theme.findAll", query = "SELECT t FROM Theme t")
public class Theme implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "theme_id")
private long themeId;
private String description;
private String name;
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "category_id", nullable=true)
private ThemeCategory themeCategory;
In ThemeCategory.java:
#Entity
#Table(name = "theme_category", uniqueConstraints = { #UniqueConstraint(columnNames = { "category_id" }) })
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
#NamedQuery(name = "ThemeCategory.findAll", query = "SELECT t FROM ThemeCategory t")
public class ThemeCategory implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "category_id")
private long categoryId;
private String description;
private String name;
// bi-directional many-to-one association to Theme
// #OneToMany(mappedBy="themeCategory")
#OneToMany(mappedBy = "themeCategory", fetch = FetchType.EAGER)
#Column(nullable = true)
#JsonManagedReference
private Set<Theme> themes;
// bi-directional many-to-one association to ThemeCategory
#ManyToOne
#JoinColumn(name = "parent_category_id", nullable=true)
#JsonBackReference
private ThemeCategory parentThemeCategory;
// bi-directional many-to-one association to ThemeCategory
// #OneToMany(mappedBy="themeCategory")
#OneToMany(mappedBy = "parentThemeCategory", fetch = FetchType.EAGER)
#Column(nullable = true)
#JsonManagedReference
private Set<ThemeCategory> themeCategories;
Theme Category Table:
CREATE TABLE `theme_category` (
`category_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`parent_category_id` smallint(5) unsigned DEFAULT NULL,
`name` varchar(45) NOT NULL,
`description` varchar(1000) DEFAULT NULL ,
`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`category_id`),
KEY `idx_parent_category_id` (`parent_category_id`),
CONSTRAINT `fk_parent_category_id` FOREIGN KEY (`parent_category_id`) REFERENCES `theme_category` (`category_id`) ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=301 DEFAULT CHARSET=utf8;
Theme Table:
CREATE TABLE `theme` (
`theme_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(45) NOT NULL,
`category_id` smallint(5) unsigned NOT NULL,
`file_path` varchar(200) DEFAULT NULL,
`description` varchar(1000) DEFAULT NULL,
`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`theme_id`),
KEY `idx_category_id` (`category_id`),
CONSTRAINT `fk_category_id` FOREIGN KEY (`category_id`) REFERENCES `theme_category` (`category_id`) ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=401 DEFAULT CHARSET=utf8;
I am using Postman extension to do a rest post call:
http://localhost:8080/CustomerRegistration/theme/create
Header params:
Content-Type: application/json
Json Body:
{"description":"theme8","name":"theme8","themeCategory":{"categoryId":302, "themes":[],"parentThemeCategory":{}, "themeCategories":[]}}
And tried around 2 hours with multiple ways of body. But it consistently saying:
The server refused this request because the request entity is in a format not supported
by the requested resource for the requested method.
To analyse, I am not getting any thing else. In Eclipse console also not showing anything regarding the this issue.
What is wrong? Is there any tools to create valid requests.