I have incomprehensible problem with Spring MVC in my REST API app. I created POJO java class with only one field and also controller with @RequestBody annotation:
@PostMapping ("/add")
ResponseEntity<ResponseDetails> save(@Valid @RequestBody CategoryDTO categoryDTO) {
Category category = categoryService.save(categoryDTO);
URI location = ServletUriComponentsBuilder.fromCurrentRequest()
.path("/{id}")
.buildAndExpand(category.getId())
.toUri();
return ResponseEntity.created(location).build();
}
POJO class with field "name":
@Value
@Builder
public class CategoryDTO {
@NotNull(message = MessageContent.VALID_NOT_NULL)
@NotBlank(message = MessageContent.VALID_NOT_BLANK)
@Size(max = 50, message = MessageContent.VALID_MAX_SIZE + 50)
@JsonProperty("name")
String name;
}
Problem shows up when I sending json request:
{
"name": "22"
}
Result of this request is exception:
2021-01-21 14:42:38.917 WARN 11084 --- [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of `pl.pg.funfactsrap.category.dto.CategoryDTO` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `pl.pg.funfactsrap.category.dto.CategoryDTO` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 2, column: 5]]
There is no exception when I am sending json with two or more arguments. Any idea? Thanx.
Here is my pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>pl.pg</groupId>
<artifactId>funfactsrap</artifactId>
<version>1.0.0</version>
<name>Fun Facts RAP</name>
<description></description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.github.javafaker</groupId>
<artifactId>javafaker</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.5.Final</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
That's work fine (below):
@Value
@Builder
public class CategoryDTO {
@NotNull(message = MessageContent.VALID_NOT_NULL)
@NotBlank(message = MessageContent.VALID_NOT_BLANK)
@Size(max = 50, message = MessageContent.VALID_MAX_SIZE + 50)
@JsonProperty("name")
String name;
String test;
}
You need a constructor with all parameters:
public CategoryDTO(String name) {
this.name = name;
}
Or using @AllArgsConstructor or @Data from lombok.
This is solution
public class CategoryDTO {
@NotNull(message = MessageContent.VALID_NOT_NULL)
@NotBlank(message = MessageContent.VALID_NOT_BLANK)
@Size(max = 50, message = MessageContent.VALID_MAX_SIZE + 50)
String name;
//String test;
@JsonCreator
public CategoryDTO(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
I removed the @Value annotation and explicitly declared setters/getters and the constructor with @JsonCreator annotation. Thanx for help.
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