diff --git a/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java b/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
index 712a748d..7f6ec92f 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
@@ -47,7 +47,8 @@ public abstract class ConvertUtils {
         ConversionServiceFactoryBean conversionServiceFactoryBean = new ConversionServiceFactoryBean();
         conversionServiceFactoryBean.setConverters(converters);
         conversionServiceFactoryBean.afterPropertiesSet();
-        return conversionServiceFactoryBean.getObject();
+        conversionService = conversionServiceFactoryBean.getObject();
+        return conversionService;
     }