SpringBoot validation doesn't work with openapi - spring-boot

Question

I'm using openapi-generator-maven-plugin version 5.4.0 to generate classes but the validaiton doesn't seem to be working in my springboot application. When I test the below with a missing name, I'm still able to make a request to the controller without any validation error. How can I fix it.
<plugin>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-maven-plugin</artifactId>
<version>5.4.0</version>
<executions>
<execution>
<id>customer</id>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<generatorName>java</generatorName>
<library>resttemplate</library>
<inputSpec>${project.basedir}/doc/swagger.yml</inputSpec>
<modelPackage>com.test.model</modelPackage>
<generateModels>true</generateModels>
<generateApis>false</generateApis>
<generateModelTests>false</generateModelTests>
<generateModelDocumentation>false</generateModelDocumentation>
<generateApiDocumentation>false</generateApiDocumentation>
<generateSupportingFiles>false</generateSupportingFiles>
<addCompileSourceRoot>true</addCompileSourceRoot>
<skipIfSpecIsUnchanged>true</skipIfSpecIsUnchanged>
<strict>true</strict>
<configOptions>
<sourceFolder>models</sourceFolder>
<dateLibrary>java11</dateLibrary>
</configOptions>
</configuration>
</execution>
</executions>
</plugin>
UserRequest:
type: object
required:
- address
- name
properties:
name:
$ref: '#/components/schemas/Address'
surname:
$ref: '#/components/schemas/Name'
Address:
type: string
description: "First name of the customer"
Name:
type: string
description: "Last name/Surname of the customer"
#PostMapping("user")
public ResponseEntity<UserResponse> createCustomer(#RequestBody UserRequest userRequest) {
return new ResponseEntity<>(userServicer.newUser(userRequest), HttpStatus.OK);
}