Добавил зависимость для валидации и поправил RequestParam

pom.xml

@@ -2,11 +2,10 @@
 <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>
-    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-parent -->
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.5</version>
+        <version>2.7.1</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
@@ -18,7 +17,11 @@
     <description>Demo project for Swagger</description>
 
     <properties>
-        <java.version>21</java.version>
+        <java.version>17</java.version>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     </properties>
 
     <dependencies>
@@ -27,11 +30,20 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
-        <!-- https://mvnrepository.com/artifact/org.springdoc/springdoc-openapi-starter-webmvc-ui -->
+        <dependency>
+            <groupId>io.swagger.core.v3</groupId>
+            <artifactId>swagger-annotations</artifactId>
+            <version>2.2.1</version>
+        </dependency>
         <dependency>
             <groupId>org.springdoc</groupId>
-            <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
-            <version>2.6.0</version>
+            <artifactId>springdoc-openapi-ui</artifactId>
+            <version>1.6.9</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
         </dependency>
     </dependencies>
 
@@ -44,13 +56,4 @@
         </plugins>
     </build>
 
-    <developers>
-        <developer>
-            <id>uPagge</id>
-            <name>Struchkov Mark</name>
-            <email>mark@struchkov.dev</email>
-            <url>https://mark.struchkov.dev</url>
-        </developer>
-    </developers>
-
 </project>

src/main/java/org/sadtech/example/swagger/config/OpenApiConfig.java

@@ -1,23 +0,0 @@
-package org.sadtech.example.swagger.config;
-
-import io.swagger.v3.oas.annotations.OpenAPIDefinition;
-import io.swagger.v3.oas.annotations.info.Contact;
-import io.swagger.v3.oas.annotations.info.Info;
-
-/**
- * @author upagge 30.12.2020
- */
-@OpenAPIDefinition(
-        info = @Info(
-                title = "Loyalty System Api",
-                description = "Loyalty System", version = "1.0.0",
-                contact = @Contact(
-                        name = "Struchkov Mark",
-                        email = "mark@struchkov.dev",
-                        url = "https://mark.struchkov.dev"
-                )
-        )
-)
-public class OpenApiConfig {
-
-}

src/main/java/org/sadtech/example/swagger/config/SwaggerConfig.java

@@ -0,0 +1,31 @@
+package org.sadtech.example.swagger.config;
+
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.info.Contact;
+import io.swagger.v3.oas.models.info.Info;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author upagge 30.12.2020
+ */
+@Configuration
+public class SwaggerConfig {
+
+    @Bean
+    public OpenAPI customOpenAPI() {
+        return new OpenAPI()
+                .info(
+                        new Info()
+                                .title("Loyalty System Api")
+                                .version("1.0.0")
+                                .contact(
+                                        new Contact()
+                                                .email("me@upagge.ru")
+                                                .url("https://uPagge.ru")
+                                                .name("Struchkov Mark")
+                                )
+                );
+    }
+
+}

src/main/java/org/sadtech/example/swagger/controller/PointController.java

@@ -2,23 +2,19 @@ package org.sadtech.example.swagger.controller;
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
-import io.swagger.v3.oas.annotations.enums.ParameterIn;
-import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
-import jakarta.validation.constraints.Min;
-import jakarta.validation.constraints.NotBlank;
 import org.sadtech.example.swagger.dto.TypeOperation;
 import org.sadtech.example.swagger.dto.UserDto;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
 import java.util.Map;
 
 /**
@@ -37,12 +33,11 @@ public class PointController {
     }
 
     @PostMapping("{key}")
-    @ApiResponse(responseCode = "400", description = "Неверный запрос — количество баллов должно быть неотрицательным")
     @Operation(summary = "Управление баллами", description = "Позволяет удалить или добавить баллы пользователю")
     public HttpStatus changePoints(
             @PathVariable @NotBlank @Parameter(description = "Идентификатор пользователя") String key,
-            @RequestParam("point") @Min(0) @Parameter(description = "Количество баллов", required = true, example = "100") Long point,
-            @RequestParam("type") @Parameter(description = "Тип операции", required = true, example = "PLUS") TypeOperation type
+            @RequestParam("point") @Min(0) @Parameter(description = "Количество баллов", required = true) Long point,
+            @RequestParam("type") @Parameter(description = "Тип операции", required = true) TypeOperation type
     ) {
         final UserDto userDto = repository.get(key);
         userDto.setPoints(

src/main/java/org/sadtech/example/swagger/controller/UserController.java

@@ -1,6 +1,5 @@
 package org.sadtech.example.swagger.controller;
 
-import io.swagger.v3.oas.annotations.ExternalDocumentation;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import org.sadtech.example.swagger.dto.UserDto;
@@ -23,14 +22,7 @@ import static org.springframework.util.MimeTypeUtils.APPLICATION_JSON_VALUE;
  */
 @RestController
 @RequestMapping("/api/user")
-@Tag(
-        name = "User Controller",
-        description = "Контроллер для управления пользователями",
-        externalDocs = @ExternalDocumentation(
-                description = "Ссылка на общую документацию",
-                url = "https://example.com/docs/user-controller"
-        )
-)
+@Tag(name = "Пользователи", description = "Взаимодействие с пользователями")
 public class UserController {
 
     private final Map<String, UserDto> repository;

src/main/java/org/sadtech/example/swagger/dto/UserDto.java

@@ -2,6 +2,7 @@ package org.sadtech.example.swagger.dto;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 
+import javax.validation.constraints.NotBlank;
 import java.time.LocalDateTime;
 
 /**