fix hugegraph-hbase and hugegraph-example checkstyle issue

hugegraph-example/src/main/java/com/baidu/hugegraph/example/Example3.java

@@ -82,23 +82,23 @@ public static void loadNeighborRankData(final HugeGraph graph) {
 
         graph.tx().open();
 
-        Vertex O = graph.addVertex(T.label, "person", T.id, "O", "name", "O");
+        Vertex o = graph.addVertex(T.label, "person", T.id, "O", "name", "O");
 
-        Vertex A = graph.addVertex(T.label, "person", T.id, "A", "name", "A");
-        Vertex B = graph.addVertex(T.label, "person", T.id, "B", "name", "B");
-        Vertex C = graph.addVertex(T.label, "person", T.id, "C", "name", "C");
-        Vertex D = graph.addVertex(T.label, "person", T.id, "D", "name", "D");
+        Vertex a = graph.addVertex(T.label, "person", T.id, "A", "name", "A");
+        Vertex b = graph.addVertex(T.label, "person", T.id, "B", "name", "B");
+        Vertex c = graph.addVertex(T.label, "person", T.id, "C", "name", "C");
+        Vertex d = graph.addVertex(T.label, "person", T.id, "D", "name", "D");
 
-        Vertex E = graph.addVertex(T.label, "movie", T.id, "E", "name", "E");
-        Vertex F = graph.addVertex(T.label, "movie", T.id, "F", "name", "F");
-        Vertex G = graph.addVertex(T.label, "movie", T.id, "G", "name", "G");
-        Vertex H = graph.addVertex(T.label, "movie", T.id, "H", "name", "H");
-        Vertex I = graph.addVertex(T.label, "movie", T.id, "I", "name", "I");
-        Vertex J = graph.addVertex(T.label, "movie", T.id, "J", "name", "J");
+        Vertex e = graph.addVertex(T.label, "movie", T.id, "E", "name", "E");
+        Vertex f = graph.addVertex(T.label, "movie", T.id, "F", "name", "F");
+        Vertex g = graph.addVertex(T.label, "movie", T.id, "G", "name", "G");
+        Vertex h = graph.addVertex(T.label, "movie", T.id, "H", "name", "H");
+        Vertex i = graph.addVertex(T.label, "movie", T.id, "I", "name", "I");
+        Vertex j = graph.addVertex(T.label, "movie", T.id, "J", "name", "J");
 
-        Vertex K = graph.addVertex(T.label, "person", T.id, "K", "name", "K");
-        Vertex L = graph.addVertex(T.label, "person", T.id, "L", "name", "L");
-        Vertex M = graph.addVertex(T.label, "person", T.id, "M", "name", "M");
+        Vertex k = graph.addVertex(T.label, "person", T.id, "K", "name", "K");
+        Vertex l = graph.addVertex(T.label, "person", T.id, "L", "name", "L");
+        Vertex m = graph.addVertex(T.label, "person", T.id, "M", "name", "M");
 
         O.addEdge("follow", A);
         O.addEdge("follow", B);
@@ -149,25 +149,25 @@ public static void loadPersonalRankData(final HugeGraph graph) {
 
         graph.tx().open();
 
-        Vertex A = graph.addVertex(T.label, "person", T.id, "A", "name", "A");
-        Vertex B = graph.addVertex(T.label, "person", T.id, "B", "name", "B");
-        Vertex C = graph.addVertex(T.label, "person", T.id, "C", "name", "C");
+        Vertex aPerson = graph.addVertex(T.label, "person", T.id, "A", "name", "A");
+        Vertex bPerson = graph.addVertex(T.label, "person", T.id, "B", "name", "B");
+        Vertex cPerson = graph.addVertex(T.label, "person", T.id, "C", "name", "C");
 
         Vertex a = graph.addVertex(T.label, "movie", T.id, "a", "name", "a");
         Vertex b = graph.addVertex(T.label, "movie", T.id, "b", "name", "b");
         Vertex c = graph.addVertex(T.label, "movie", T.id, "c", "name", "c");
         Vertex d = graph.addVertex(T.label, "movie", T.id, "d", "name", "d");
 
-        A.addEdge("like", a);
-        A.addEdge("like", c);
+        aPerson.addEdge("like", a);
+        aPerson.addEdge("like", c);
 
-        B.addEdge("like", a);
-        B.addEdge("like", b);
-        B.addEdge("like", c);
-        B.addEdge("like", d);
+        bPerson.addEdge("like", a);
+        bPerson.addEdge("like", b);
+        bPerson.addEdge("like", c);
+        bPerson.addEdge("like", d);
 
-        C.addEdge("like", c);
-        C.addEdge("like", d);
+        cPerson.addEdge("like", c);
+        cPerson.addEdge("like", d);
 
         graph.tx().commit();
     }

hugegraph-example/src/main/java/com/baidu/hugegraph/example/ExampleUtil.java

@@ -22,6 +22,7 @@
 import java.io.File;
 import java.util.Iterator;
 import java.util.concurrent.TimeoutException;
+import org.slf4j.Logger;
 
 import com.baidu.hugegraph.HugeException;
 import com.baidu.hugegraph.HugeFactory;
@@ -32,8 +33,10 @@
 import com.baidu.hugegraph.task.HugeTask;
 import com.baidu.hugegraph.task.TaskScheduler;
 import com.baidu.hugegraph.type.define.NodeRole;
+import com.baidu.hugegraph.util.Log;
 
 public class ExampleUtil {
+    private static final Logger LOG = Log.logger(ExampleUtil.class);
 
     private static boolean registered = false;
 
@@ -71,6 +74,7 @@ public static HugeGraph loadGraph(boolean needClear, boolean needProfile) {
                 conf = path;
             }
         } catch (Exception ignored) {
+            LOG.warn("loadGraph warn {} ",ignored);
         }
 
         HugeGraph graph = HugeFactory.open(conf);