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>2.7.18</version>
+        <version>2.7.1</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
@@ -19,6 +18,10 @@
 
     <properties>
         <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>
@@ -27,17 +30,20 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
-        <!-- https://mvnrepository.com/artifact/io.swagger.core.v3/swagger-annotations -->
         <dependency>
             <groupId>io.swagger.core.v3</groupId>
             <artifactId>swagger-annotations</artifactId>
-            <version>2.2.25</version>
+            <version>2.2.1</version>
         </dependency>
-        <!-- https://mvnrepository.com/artifact/org.springdoc/springdoc-openapi-ui -->
         <dependency>
             <groupId>org.springdoc</groupId>
             <artifactId>springdoc-openapi-ui</artifactId>
-            <version>1.8.0</version>
+            <version>1.6.9</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
         </dependency>
     </dependencies>
 
@@ -50,13 +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/controller/PointController.java

@@ -10,7 +10,7 @@ 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.RequestMapping;
-import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import javax.validation.constraints.Min;
@@ -36,8 +36,8 @@ public class PointController {
     @Operation(summary = "Управление баллами", description = "Позволяет удалить или добавить баллы пользователю")
     public HttpStatus changePoints(
             @PathVariable @NotBlank @Parameter(description = "Идентификатор пользователя") String key,
-            @RequestPart("point") @Min(0) @Parameter(description = "Количество баллов", required = true) Long point,
+            @RequestParam("point") @Min(0) @Parameter(description = "Количество баллов", required = true) Long point,
-            @RequestPart("type") @Parameter(description = "Тип операции", required = true) TypeOperation type
+            @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/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;
 
 /**