JAVA----JSON序列化错误:InvalidDefinitionException: No serializer found for class org.apache.ibatis.execut

场景

今天配置ssm项目时,使用的是GET请求,当输完错误时,发现报500错误

HTTP Status 500 – Internal Server Error
Type 异常报告消息 Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.dept.emp.domain.entity.Dept_$$_jvst983_0["handler"])描述 服务器遇到一个意外的情况，阻止它完成请求。Exceptionorg.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.dept.emp.domain.entity.Dept_$$_jvst983_0["handler"])org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)javax.servlet.http.HttpServlet.service(HttpServlet.java:634)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)javax.servlet.http.HttpServlet.service(HttpServlet.java:741)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Causeorg.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.dept.emp.domain.entity.Dept_$$_jvst983_0["handler"])org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:323)org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:104)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:287)org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:181)org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:123)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)javax.servlet.http.HttpServlet.service(HttpServlet.java:634)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)javax.servlet.http.HttpServlet.service(HttpServlet.java:741)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Causecom.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.dept.emp.domain.entity.Dept_$$_jvst983_0["handler"])com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1277)com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:400)com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:71)com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:33)com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1513)com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1005)org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:317)org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:104)org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:287)org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:181)org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:123)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)javax.servlet.http.HttpServlet.service(HttpServlet.java:634)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)javax.servlet.http.HttpServlet.service(HttpServlet.java:741)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

经过排查后发现,后端是可以接收到前端发过来的请求的,但是响应时出现了问题,发现是JSON序列化错误,
此时因为业务需求,后端使用的是一对多的级联嵌套查询,然后配置时设置了懒加载,在mybatis-comfig.xml文件中进行的配置

<!--       懒加载,延迟查询     在使用到mybatis的嵌套查询时,如果没有使用到另一方,则不会进行查询--><setting name="lazyLoadingEnabled" value="true"/>

通过java的反射机制将pojo转换成json的。

因为json plugin用的是java的内审机制.被管理的pojo会加入[“hibernateLazyInitializer”,“handler”,“fieldHandler”]等属性,json plugin会对这些属性拿出来操作,并读取里面一个不能被反射操作的属性就产生了异常。

实体类中有的字段值为null，所以在json化的时候，fasterxml.jackson将对象转换为json报错。

两个解决办法

1.关闭懒加载,但是不建议这么干,如果关闭了一次性把所有的数据加载出来,数据量会过于庞大
2.使用一个注解
@JsonIgnoreProperties(value = { “handler” }) 设计到级联查询的两个实体类上使用该注解就能解决了.

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JAVA----JSON序列化错误:InvalidDefinitionException: No serializer found for class org.apache.ibatis.execut

场景

两个解决办法

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