diff --git a/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java b/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
index 8eb19defb..ca27ffdc4 100644
--- a/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
+++ b/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
@@ -225,9 +225,10 @@ public class Bootstrap {
             System.exit(0);
         }
 
-        if (JavaVersionUtils.isJava6()) {
+        if (JavaVersionUtils.isJava6() || JavaVersionUtils.isJava7()) {
             bootStrap.setuseHttp(true);
-            AnsiLog.debug("Java version is 1.6, only support http, set useHttp to true.");
+            AnsiLog.debug("Java version is {}, only support http, set useHttp to true.",
+                            System.getProperty("java.specification.version"));
         }
 
         // check telnet/http port
diff --git a/common/src/main/java/com/taobao/arthas/common/JavaVersionUtils.java b/common/src/main/java/com/taobao/arthas/common/JavaVersionUtils.java
index 4bcac9730..1e255f8a3 100644
--- a/common/src/main/java/com/taobao/arthas/common/JavaVersionUtils.java
+++ b/common/src/main/java/com/taobao/arthas/common/JavaVersionUtils.java
@@ -6,11 +6,12 @@ package com.taobao.arthas.common;
  *
  */
 public class JavaVersionUtils {
-    public static void main(String[] args) {
-        System.err.println(JavaVersionUtils.isJava8());
-    }
+    private static final String javaVersionStr = System.getProperty("java.specification.version");
+    private static final float javaVersion = Float.parseFloat(javaVersionStr);
 
-    private static final float javaVersion = Float.parseFloat(System.getProperty("java.specification.version"));
+    public static String javaVersionStr() {
+        return javaVersionStr;
+    }
 
     public static float javaVersion() {
         return javaVersion;