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项目记事【SpringMVC-2】：将后台的对象，转成JSON报文
发布日期：2021-05-09 03:59:04 浏览次数：14 分类：博客文章

本文共 11685 字，大约阅读时间需要 38 分钟。

Spring版本：3.2.7

 

Jackson版本：

1 
      2 
     
       3     
      
       com.fasterxml.jackson.core
       4     
      
       jackson-databind
       5     
      
       2.1.3
       6 
      7 
     
       8     
      
       com.fasterxml.jackson.core
       9     
      
       jackson-core
      10     
      
       2.1.3
      11 
     12 
     
      13     
      
       com.fasterxml.jackson.core
      14     
      
       jackson-annotations
      15     
      
       2.1.2
      16
POM文件配置

 

背景：

需要将后端的一个对象，通过SPringMVC框架，传递到前端时，自动转换成对应的JSON格式报文。

 

堆栈信息：

org.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 SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.siebre.pms.common.model.ResponseVO["data"]->com.siebre.pms.template.model.LiabilityTemplateDO["propertyAssignments"]->org.hibernate.collection.PersistentBag[0]->com.siebre.pms.template.model.PropertyAssignmentTemplateDO["propertyTemplate"]->com.siebre.pms.template.model.PropertyTemplateDO_$$_javassist_187["handler"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.siebre.pms.common.model.ResponseVO["data"]->com.siebre.pms.template.model.LiabilityTemplateDO["propertyAssignments"]->org.hibernate.collection.PersistentBag[0]->com.siebre.pms.template.model.PropertyAssignmentTemplateDO["propertyTemplate"]->com.siebre.pms.template.model.PropertyTemplateDO_$$_javassist_187["handler"])    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:207)    at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.writeWithMessageConverters(AnnotationMethodHandlerAdapter.java:1037)    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.handleResponseBody(AnnotationMethodHandlerAdapter.java:995)    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.getModelAndView(AnnotationMethodHandlerAdapter.java:944)    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:441)    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at com.siebre.web.servlet.filter.CorsFilter.doFilter(CorsFilter.java:53)    at com.siebre.web.servlet.filter.CorsFilter.doFilter(CorsFilter.java:34)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at com.siebre.webapp.filter.WindowContextFilter.doFilterInternal(WindowContextFilter.java:274)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)    at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)    at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.rememberme.RememberMeProcessingFilter.doFilterHttp(RememberMeProcessingFilter.java:116)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at com.siebre.security.ui.ClientLoginProcessingFilter.doFilterHttp(ClientLoginProcessingFilter.java:147)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)    at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:230)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at com.siebre.webapp.filter.CacheControlFilter.doFilter(CacheControlFilter.java:34)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at com.siebre.webapp.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:29)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:845)    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:688)    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1315)    at java.lang.Thread.run(Thread.java:595)

 

错误原因分析：

后端对象中，有部分对象是以懒加载的形式初始化的，在ObjectMapper将对象转为JSON时，这部分对象尚未初始化，报错。

 

解决方案分析：

这种情况，在Jackson设计的时候，一定会考虑到。

通过堆栈信息，不难发现，这个转换工作，是由框架的 MappingJackson2HttpMessageConverter 这个类完成。

通过堆栈信息，还可以发现，问题主要由ObjectMapper的这个属性：SerializationFeature.FAIL_ON_EMPTY_BEANS，引发的。

由此，我们可以自定义一个 Mapper 继承 ObjectMapper，将以上属性转成我们所需要的即可。

 

解决方案：

1 public class CustomMapper extends ObjectMapper {2 3     public CustomMapper() {4         this.setSerializationInclusion(JsonInclude.Include.NON_NULL);5         // 设置 SerializationFeature.FAIL_ON_EMPTY_BEANS 为 false6         this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);7     }8 9 }
CustomMapper

 

1 
     
       2     
       3     
      
        4         
       
         5             
        
         text/html;charset=UTF-8
         6             
        
         application/x-www-form-urlencoded;charset=UTF-8
         7             
        
         application/json;charset=UTF-8
         8         
        9     
      10     
      11     
      
       12         
       
        13         
       14     
      15
webmvc-config.xml

 

Over，问题解决！

 

上一篇：设计模式（一）单例模式：概述
下一篇：项目记事【SpringMVC-1】：后台接收前端传来的JSON，并转成对象

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