[DE-437] added jvm version to user agent header

Author: rashtao

driver/src/main/java/com/arangodb/internal/http/HttpConnection.java

@@ -71,7 +71,7 @@ public class HttpConnection implements Connection {
     private static final Logger LOGGER = LoggerFactory.getLogger(HttpConnection.class);
     private static final String CONTENT_TYPE_APPLICATION_JSON_UTF8 = "application/json; charset=utf-8";
     private static final String CONTENT_TYPE_VPACK = "application/x-velocypack";
-    private static final String USER_AGENT = "JavaDriver/" + PackageVersion.VERSION;
+    private static final String USER_AGENT = getUserAgent();
     private static final AtomicInteger THREAD_COUNT = new AtomicInteger();
     private final InternalSerde util;
     private final ContentType contentType;
@@ -80,6 +80,10 @@ public class HttpConnection implements Connection {
     private final Integer timeout;
     private final Vertx vertx;
 
+    private static String getUserAgent() {
+        return "JavaDriver/" + PackageVersion.VERSION + " (JVM/" + System.getProperty("java.specification.version") + ")";
+    }
+
     private HttpConnection(final HostDescription host, final Integer timeout, final String user, final String password,
                            final Boolean useSsl, final SSLContext sslContext, final Boolean verifyHost,
                            final InternalSerde util, final Protocol protocol, final Long ttl) {

driver/src/test/java/com/arangodb/PackageVersionTest.java

@@ -43,7 +43,12 @@ void userAgentHeader(Protocol protocol) {
                 .method(Request.Method.GET)
                 .path("/_admin/echo")
                 .build(), JsonNode.class);
-        assertThat(resp.getBody().get("headers").get("x-arango-driver").textValue()).endsWith(PackageVersion.VERSION);
+        String headerValue = resp.getBody().get("headers").get("x-arango-driver").textValue();
+
+        String jvmVersion = System.getProperty("java.specification.version");
+        String expected = "JavaDriver/" + PackageVersion.VERSION + " (JVM/" + jvmVersion + ")";
+
+        assertThat(headerValue).isEqualTo(expected);
         adb.shutdown();
     }
 }