Jackson, Spring and Hibernate are the three popular frameworks in their respective technologies but there are some issues occuring while using all these 3 together due to serialization of lazy loaded hibernate objects.
I faced a similar issue while converting Hibernate object to JSON using Jackson API in a Spring based web application and following is a sample error description:
No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer to avoid exception, disable
SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS)
Approach to solve the above issue:
Having gone through various forums and many different solutions, I have decided to zero in on using JacksonDatatypeHibernate add-on to fix the lazy loading concerns.
Step 1:
Write an ObjectMapper extension-class in one of your packages to inject Hibernate4Module object into ObjectMapper:
Step 2:
Register ObjectMapper extension-class(HibernateAwareObjectMapper) in the Spring-Config.xml with the following configuration:
Important note:
Never configure message converters outside of the annotation-driver tag when mvc:annotation-driven is enabled. The registered message converter has to be inside the message-converters tag.
This is it.
I faced a similar issue while converting Hibernate object to JSON using Jackson API in a Spring based web application and following is a sample error description:
No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer to avoid exception, disable
SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS)
Approach to solve the above issue:
Having gone through various forums and many different solutions, I have decided to zero in on using JacksonDatatypeHibernate add-on to fix the lazy loading concerns.
Step 1:
Write an ObjectMapper extension-class in one of your packages to inject Hibernate4Module object into ObjectMapper:
Step 2:
Register ObjectMapper extension-class(HibernateAwareObjectMapper) in the Spring-Config.xml with the following configuration:
Important note: Never configure message converters outside of the annotation-driver tag when mvc:annotation-driven is enabled. The registered message converter has to be inside the message-converters tag.
This is it.
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