add userServiceClient for GraphQl Queries on userService

build.gradle

@@ -107,6 +107,7 @@ dependencies {
     implementation 'org.modelmapper:modelmapper:3.+'
     implementation 'com.graphql-java:graphql-java-extended-scalars:22.0'
     implementation 'com.graphql-java:graphql-java-extended-validation:22.0'
+    implementation 'org.springframework.boot:spring-boot-starter-webflux'
     implementation 'io.dapr:dapr-sdk:1.9.0' // Dapr's core SDK with all features, except Actors.
     implementation 'io.dapr:dapr-sdk-springboot:1.9.0' // Dapr's SDK integration with SpringBoot
     implementation 'org.json:json:20240303' // JSON parsing for import from TMS

src/main/java/de/unistuttgart/iste/meitrex/assignment_service/config/UserServiceClientConfiguration.java

@@ -0,0 +1,21 @@
+package de.unistuttgart.iste.meitrex.assignment_service.config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.graphql.client.GraphQlClient;
+import org.springframework.graphql.client.HttpGraphQlClient;
+import org.springframework.web.reactive.function.client.WebClient;
+
+@Configuration
+public class UserServiceClientConfiguration {
+
+    @Value("${user_service.url}")
+    private String userServiceUrl;
+
+    @Bean
+    public GraphQlClient userServiceClient() {
+        final WebClient webClient = WebClient.builder().baseUrl(userServiceUrl).build();
+        return HttpGraphQlClient.builder(webClient).build();
+    }
+}

src/main/java/de/unistuttgart/iste/meitrex/assignment_service/service/GradingService.java

@@ -14,6 +14,7 @@
 import jakarta.persistence.EntityNotFoundException;
 import jakarta.validation.ValidationException;
 import lombok.RequiredArgsConstructor;
+import org.springframework.graphql.client.GraphQlClient;
 import org.springframework.stereotype.Service;
 import org.json.*;
 
@@ -39,6 +40,8 @@ public class GradingService {
     private final TopicPublisher topicPublisher;
     private final AssignmentService assignmentService;
 
+    private final GraphQlClient userServiceClient;
+
     // these need to be set!
     private static final String authToken = "";
     private static final String basePath = "";