diff --git a/hugegraph-hubble/hubble-be/src/main/java/org/apache/hugegraph/HugeGraphHubble.java b/hugegraph-hubble/hubble-be/src/main/java/org/apache/hugegraph/HugeGraphHubble.java
index b4587d4c0..e5057b962 100644
--- a/hugegraph-hubble/hubble-be/src/main/java/org/apache/hugegraph/HugeGraphHubble.java
+++ b/hugegraph-hubble/hubble-be/src/main/java/org/apache/hugegraph/HugeGraphHubble.java
@@ -42,10 +42,11 @@ public static void main(String[] args) {
 
     public static void initEnv() {
         System.setProperty("file.encoding", "UTF-8");
-        Ex.check(Charset.defaultCharset().equals(StandardCharsets.UTF_8),"Charset must be UTF-8, current:"+Charset.defaultCharset());
+        Ex.check(Charset.defaultCharset().equals(StandardCharsets.UTF_8),
+                "Charset must be UTF-8, current:" + Charset.defaultCharset());
         String hubbleHomePath = System.getProperty("hubble.home.path");
         Ex.check(StringUtils.isNotEmpty(hubbleHomePath),
-                 "The system property 'hubble.home.path' must be set");
+                "The system property 'hubble.home.path' must be set");
         String loaderHomePath = System.getProperty("loader.home.path");
         if (StringUtils.isEmpty(loaderHomePath)) {
             System.setProperty("loader.home.path", hubbleHomePath);