【hibernate 报错】No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer 【get和load的区别】

1 HTTP Status 500 - Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered 
2 to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.agen.entity.Product_$$_jvst2a_3["handler"]);
3  nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no 
4 properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.agen.entity.Product_$$_jvst2a_3["handler"])

 1 @ResponseBody
 2     @RequestMapping("/Updateproduct")
 3     @Transactional
 4     public Product updateProduct2(Product product){
 5         Product  product1 = productService.load(product.getProductId());
 6         if(product1 != null){
 7             product1.setProductName(product.getProductName());
 8             product1.setProductCre(product.getProductCre());
 9         }
10         
11         return product1;
12     }

 1 /**
 2      * 进行产品修改操作
 3      * @return
 4      */
 5     @ResponseBody
 6     @RequestMapping("/Updateproduct")
 7     @Transactional
 8     public Product updateProduct2(Product product){
 9         Product  product1 = productService.get(product.getProductId());
10         if(product1 != null){
11             product1.setProductName(product.getProductName());
12             product1.setProductCre(product.getProductCre());
13         }
14         
15         return product1;
16     }