[BUG][Spring] @Validated and @Valid annotations are in wrong place

Description

@Validated annotation is in wrong place while generating endpoint. Annotation should be at method level, not at class level:
https://docs.spring.io/spring-framework/reference/web/webmvc/mvc-controller/ann-validation.html

"If a controller has a class level @Validated, then method validation is applied through an AOP proxy. In order to take advantage of the Spring MVC built-in support for method validation added in Spring Framework 6.1, you need to remove the class level @Validated annotation from the controller."

@Validated on the class level, leads, that validation for the parameters is done twice.

@Valid annotation is at field and getter level, if attribute is type List. This leads, that List wit all it's objects is validated twice.

In worst scenario validation is done 4 times, that may be really expencive

openapi-generator version

7.6.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Swagger Petstore - OpenAPI 3.0
  description: |-
    This is a sample Pet Store Server based on the OpenAPI 3.0 specification.  You can find out more about
    Swagger at [https://swagger.io](https://swagger.io). In the third iteration of the pet store, we've switched to the design first approach!
    You can now help us improve the API whether it's by making changes to the definition itself or to the code.
    That way, with time, we can improve the API in general, and expose some of the new features in OAS3.

    _If you're looking for the Swagger 2.0/OAS 2.0 version of Petstore, then click [here](https://editor.swagger.io/?url=https://petstore.swagger.io/v2/swagger.yaml). Alternatively, you can load via the `Edit > Load Petstore OAS 2.0` menu option!_
    
    Some useful links:
    - [The Pet Store repository](https://github.com/swagger-api/swagger-petstore)
    - [The source API definition for the Pet Store](https://github.com/swagger-api/swagger-petstore/blob/master/src/main/resources/openapi.yaml)
  termsOfService: http://swagger.io/terms/
  contact:
    email: apiteam@swagger.io
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: 1.0.11
externalDocs:
  description: Find out more about Swagger
  url: http://swagger.io
servers:
  - url: https://petstore3.swagger.io/api/v3
tags:
  - name: pet
    description: Everything about your Pets
    externalDocs:
      description: Find out more
      url: http://swagger.io
  - name: store
    description: Access to Petstore orders
    externalDocs:
      description: Find out more about our store
      url: http://swagger.io
  - name: user
    description: Operations about user
paths:
  /pet:
    post:
      tags:
        - pet
      summary: Add a new pet to the store
      description: Add a new pet to the store
      operationId: addPet
      requestBody:
        description: Create a new pet in the store
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Pet'
        required: true
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pet'
        '400':
          description: Invalid input
        '422':
          description: Validation exception
components:
  schemas:

    Tag:
      type: object
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
      xml:
        name: tag
    Pet:
      required:
        - name
        - photoUrls
      type: object
      properties:
        id:
          type: integer
          format: int64
          example: 10
        name:
          type: string
          example: doggie
        tags:
          type: array
          xml:
            wrapped: true
          items:
            $ref: '#/components/schemas/Tag'
        status:
          type: string
          description: pet status in the store
          enum:
            - available
            - pending
            - sold
      xml:
        name: pet
    ApiResponse:
      type: object
      properties:
        code:
          type: integer
          format: int32
        type:
          type: string
        message:
          type: string
  requestBodies:
    Pet:
      description: Pet object that needs to be added to the store
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Pet'

Generation Details

<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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>openapi-validated-bug</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>openapi-validated-bug</name>
    <url>http://maven.apache.org</url>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <openapi.generator.maven.plugin.version>7.6.0</openapi.generator.maven.plugin.version>
        <build-helper-maven-plugin.version>3.6.0</build-helper-maven-plugin.version>
        <maven-compiler-plugin.version>3.13.0</maven-compiler-plugin.version>
        <jackson.version>2.17.1</jackson.version>
        <jakarta-annotation.version>3.0.0</jakarta-annotation.version>
        <jakarta-validation.version>3.1.0</jakarta-validation.version>
        <jackson-databind-nullable.version>0.2.6</jackson-databind-nullable.version>
        <spring-test.version>6.1.8</spring-test.version>
        <spring-cloud-contract-wiremock.version>4.1.2</spring-cloud-contract-wiremock.version>
        <springdoc-openapi-starter-webmvc-ui.version>2.5.0</springdoc-openapi-starter-webmvc-ui.version>
        <org.springframework.boot.version>3.2.5</org.springframework.boot.version>
    </properties>
    <build>
        <plugins>
            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>${openapi.generator.maven.plugin.version}</version>
                <executions>
                    <execution>
                        <id>openapi-validated-api</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <phase>generate-sources</phase>
                        <configuration>
                            <inputSpec>
                                ${basedir}/src/main/resources/openapi.yaml
                            </inputSpec>
                            <generatorName>spring</generatorName>
                            <apiPackage>
                                org.openapi.validated.bug.api
                            </apiPackage>
                            <modelPackage>
                                org.openapi.validated.bug.model
                            </modelPackage>
                            <generateSupportingFiles>false</generateSupportingFiles>
                            <configOptions>
                                <skipDefaultInterface>true</skipDefaultInterface>
                                <generateSpringApplication>false</generateSpringApplication>
                                <generateSpringBootApplication>false</generateSpringBootApplication>
                                <dateLibrary>java8</dateLibrary>
                                <interfaceOnly>true</interfaceOnly>
                                <implicitHeaders>true</implicitHeaders>
                                <useSpringBoot3>true</useSpringBoot3>
                                <reactive>false</reactive>
                                <useTags>true</useTags>
                            </configOptions>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>${build-helper-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <id>add-source</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>add-source</goal>
                        </goals>
                        <configuration>
                            <sources>
                                <source>target/generated-sources/openapi/src/main/java</source>
                            </sources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven-compiler-plugin.version}</version>
                <configuration>
                    <parameters>true</parameters>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <!-- Jopo dependencies -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>org.openapitools</groupId>
            <artifactId>jackson-databind-nullable</artifactId>
            <version>${jackson-databind-nullable.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springdoc</groupId>
            <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
            <version>${springdoc-openapi-starter-webmvc-ui.version}</version>
        </dependency>
        <dependency>
            <groupId>jakarta.validation</groupId>
            <artifactId>jakarta.validation-api</artifactId>
            <version>${jakarta-validation.version}</version>
        </dependency>
        <dependency>
            <groupId>jakarta.annotation</groupId>
            <artifactId>jakarta.annotation-api</artifactId>
            <version>${jakarta-annotation.version}</version>
        </dependency>

    </dependencies>
</project>

Steps to reproduce

Create maven project and run
mvn install

See generated class PetApi that has @Validated on class level, not method level:

@Validated
@Tag(name = "pet", description = "Everything about your Pets")
public interface PetApi {

See as well generated class Pet. field Tag and getter getTags(), both has @Valid annotation. Field should not have @Valid annotation:

...
@Valid
  private List<@Valid Tag> tags = new ArrayList<>();.
....
@Valid 
  @Schema(name = "tags", requiredMode = Schema.RequiredMode.NOT_REQUIRED)
  @JsonProperty("tags")
  public List<@Valid Tag> getTags() {
    return tags;
  }
...

Related issues/PRs

Suggest a fix

Remove @Validated annotation from class level and add it to the method level.
Remove @Valid annotation from field level in case List

Reproduce the issue with the supplied Maven project by running mvn install, then inspect the generated PetApi and Pet classes. Confirm that @Validated is generated at method level and that collection validation does not duplicate @Valid; done means the generated annotations no longer cause repeated validation.