### 개발환경
* Spring MVC 3.2.0
* Hibernate 4.2.0.Final
### 문제발생
MVC 패턴에서 Controller 단에서 @PathVariable로 객체를 받아서 처리하려는 시도를 하면서 문제가 발생했다.
### 로그
HTTP Status 500 - No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["result"]->com.sil.docsflow.web.common.Result["data"]->com.sil.docsflow.domain.company.User_$$_javassist_15["handler"])
type Exception report
message No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["result"]->com.sil.docsflow.web.common.Result["data"]->com.sil.docsflow.domain.company.User_$$_javassist_15["handler"])
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["result"]->com.sil.docsflow.web.common.Result["data"]->com.sil.docsflow.domain.company.User_$$_javassist_15["handler"])
org.codehaus.jackson.map.ser.StdSerializerProvider$1.failForEmpty(StdSerializerProvider.java:89)
org.codehaus.jackson.map.ser.StdSerializerProvider$1.serialize(StdSerializerProvider.java:62)
org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:430)
org.codehaus.jackson.map.ser.BeanSerializer.serializeFields(BeanSerializer.java:175)
org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:142)
org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:430)
org.codehaus.jackson.map.ser.BeanSerializer.serializeFields(BeanSerializer.java:175)
org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:142)
org.codehaus.jackson.map.ser.MapSerializer.serializeFields(MapSerializer.java:287)
org.codehaus.jackson.map.ser.MapSerializer.serialize(MapSerializer.java:212)
org.codehaus.jackson.map.ser.MapSerializer.serialize(MapSerializer.java:23)
org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:600)
org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:280)
org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1345)
org.springframework.web.servlet.view.json.MappingJacksonJsonView.writeContent(MappingJacksonJsonView.java:292)
org.springframework.web.servlet.view.json.MappingJacksonJsonView.renderMergedOutputModel(MappingJacksonJsonView.java:247)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.34 logs.
Apache Tomcat/7.0.34
### 해결방법
* 참조페이지 : [Strange Jackson exception being thrown when serializing Hibernate object](http://stackoverflow.com/questions/4362104/strange-jackson-exception-being-thrown-when-serializing-hibernate-object)
### 나름 분석
하이버네이트에 의해 영속화된 객체에 hadler 와 hibernateLazyInitializer 의 필드가 생성되는 것으로 보인다. 이렇게 영속화된 객체를 JSON으로 직렬화 하는 과정에서 hadler 가 lazy로 처리되어 있어서 발생하는 문제가 아닌가 추측해본다.