Add JavaClient to run the graphql query

Author: jmini

graphql-queries/JavaClient.java

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+///usr/bin/env jbang "$0" "$@" ; exit $?
+
+//DEPS io.smallrye:smallrye-graphql-client-implementation-vertx:2.10.0
+//DEPS org.eclipse:yasson:2.0.4
+
+//JAVA 17
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import io.smallrye.graphql.client.dynamic.api.DynamicGraphQLClient;
+import io.smallrye.graphql.client.Response;
+import io.smallrye.graphql.client.vertx.dynamic.VertxDynamicGraphQLClientBuilder;
+
+import io.vertx.core.Vertx;
+
+class JavaClient {
+    public static void main(String... args) throws Exception {
+        String query = Files.readString(Paths.get("work-items.query.graphql"));
+        Vertx vertx = Vertx.vertx();
+        DynamicGraphQLClient client = new VertxDynamicGraphQLClientBuilder()
+            .url("https://gitlab.com/api/graphql")
+            .vertx(vertx)
+            .build();
+        try {
+            Response response = client.executeSync(query);
+            System.out.println(response);
+        } finally {
+            client.close();
+            vertx.close();
+        }
+    }
+}

graphql-queries/README.adoc

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+== GraphQL queries
+
+This folder contains some test GraphQL queries for gitlab.com
+
+The queries can be exectued directly online: https://gitlab.com/-/graphql-explorer 
+
+GitLab GraphQL API: https://docs.gitlab.com/ee/api/graphql/
+
+=== Run with java
+
+The script `JavaClient.java` contains the necessary code to run the `work-items.query.graphql` with a java client.
+
+Just run `jbang JavaClient.java` to run the query and see the results.