checkstyle issues

web/src/test/java/lcsb/mapviewer/web/api/plugin/NewPluginControllerTest.java

@@ -53,7 +53,7 @@ public class NewPluginControllerTest extends ControllerIntegrationTest {
 
   private ObjectMapper objectMapper;
 
-  List<String> pluginHashes = new ArrayList<>();
+  private List<String> pluginHashes = new ArrayList<>();
 
   @Before
   public void setUp() throws Exception {