摘要：在使用Spring+Hibernate搭建RESTful API時，在Hibernate查詢出數據實體類使用jackson序列化為json時，返回頁面的時候報如下錯誤：

一：錯誤信息：

HTTP Status 500 - Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"])
type Exception reportmessage Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"])description The server encountered an internal error that prevented it from fulfilling this request.exceptionorg.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"])org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:196)org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)javax.servlet.http.HttpServlet.service(HttpServlet.java:617)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)javax.servlet.http.HttpServlet.service(HttpServlet.java:723)org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)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) root causecom.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.HashMap["user"]->com.qdexam.qdky.model.TblUser_$$_javassist_2["handler"])com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:59)com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:26)com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:503)com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639)com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:491)com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:412)com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:27)com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:114)com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1887)org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:193)org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)javax.servlet.http.HttpServlet.service(HttpServlet.java:617)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)javax.servlet.http.HttpServlet.service(HttpServlet.java:723)org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)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/6.0.44 logs.

二：解決辦法：

關聯類里面所有的集合都加入到@JsonIgnoreProperties
這個方法注解是放在類定義上面的,也就是說:
@JsonIgnoreProperties
class A
{

}

如果你定義的類是這樣的:

public class A{private String description;private Boolean enable;private Integer createUser;private Date createTime;private Integer updateUser;private Date updateTime;private Set operations = new HashSet(0);private Set roles = new HashSet(0);private Set menus = new HashSet(0); }

則把下面那句話加進去.
@JsonIgnoreProperties(value={“hibernateLazyInitializer”,”handler”,”operations”,”roles”,”menus”})

其中hibernateLazyInitializer，handler必須添加！

三：這樣你再重新訪問查詢出數據實體類使用jackson序列化為json時就不會再報錯了，而是直接返回json格式的數據到瀏覽器端。

總結

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