diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/annotation/XxlJob.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/annotation/XxlJob.java
index 212efdc..33fb675 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/annotation/XxlJob.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/annotation/XxlJob.java
@@ -20,11 +20,11 @@
     /**
      * init handler, invoked when JobThread init
      */
-    String init();
+    String init() default "";
 
     /**
      * destroy handler, invoked when JobThread destroy
      */
-    String destroy();
+    String destroy() default "";
 
 }