InvalidDefinitionException: No serializer found for class java.lang.Object and no properties discove

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使用springcloudgateway 搭建项目后，写个test验证返回响应，响应结果报如下错误：

{"timestamp": "2022-04-08T14:21:45.160+0000","path": "/tech/health/check","status": 500,"error": "Internal Server Error","message": "Type definition error: [simple type, class java.lang.Object]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.lang.Object and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: cn.quantgroup.yxm.gateway.mo.Result[\"data\"])"
}

具体错误信息为：


2022-04-08 22:02:21.415 [TID: N/A] [reactor-http-nio-3] ERROR o.s.b.a.w.r.e.AbstractErrorWebExceptionHandler -[dc04546c] 500 Server Error for HTTP GET "/tech/health/check"
org.springframework.core.codec.CodecException: Type definition error: [simple type, class java.lang.Object]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.lang.Object and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: cn.quantgroup.yxm.gateway.mo.Result["data"])at org.springframework.http.codec.json.AbstractJackson2Encoder.encodeValue(AbstractJackson2Encoder.java:178)at org.springframework.http.codec.json.AbstractJackson2Encoder.lambda$encode$0(AbstractJackson2Encoder.java:122)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:107)at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:162)at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1878)at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1752)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:90)at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54)at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59)at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44)at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150)at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1505)at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:241)at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73)at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:204)at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:204)at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1505)at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onNext(MonoIgnoreThen.java:296)at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070)at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onSubscribe(MonoIgnoreThen.java:285)at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:161)at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:53)at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153)at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74)at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150)at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67)at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76)at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275)at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121)at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:162)at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1878)at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1752)at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:90)at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54)at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59)at reactor.core.publisher.Mono.subscribe(Mono.java:3710)at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442)at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:212)at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139)at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63)at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121)at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40)at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44)at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61)at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)at reactor.core.publisher.Mono.subscribe(Mono.java:3710)at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172)at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:70)at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61)at reactor.netty.http.server.HttpServerHandle.onStateChange(HttpServerHandle.java:64)at reactor.netty.tcp.TcpServerBind$ChildObserver.onStateChange(TcpServerBind.java:234)at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:436)at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:141)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:162)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438)at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1408)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:677)at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:612)at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:529)at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:491)at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)at java.lang.Thread.run(Thread.java:748)
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.lang.Object and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: cn.quantgroup.yxm.gateway.mo.Result["data"])at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1191)at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:313)at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:71)at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:33)at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727)at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719)at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1396)at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:913)at org.springframework.http.codec.json.AbstractJackson2Encoder.encodeValue(AbstractJackson2Encoder.java:174)... 95 common frames omitted

解决方案为：

方案1、设置ObjectMapper 为disable 为SerializationFeature.FAIL_ON_EMPTY_BEANS，并注入bean

@Configuration
public class BeanConfig {@Beanpublic ObjectMapper objectMapper(){return new ObjectMapper().disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);}
}或者@Configuration
public class BeanConfig {@Beanpublic Jackson2ObjectMapperBuilder objectMapper(){Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();builder.featuresToDisable(SerializationFeature.FAIL_ON_EMPTY_BEANS);return builder;}
}

结果符合预期，验证输出结果为：

{"code": 200,"message": "","data": {}}

方案2：响应结果对象允许为空的字段对象上，添加JsonIgnore注解

import com.fasterxml.jackson.annotation.JsonIgnore;

@Data
public class Result<T> implements java.io.Serializable {/*** 0成功,永远默认成功*/private String code = "0000";/*** 业务错误码*/private String businessCode = ResultCode.SUCCESS.getCode();/*** 消息**/private String msg;/*** 详细消息**/private String detail;/*** 数据**/@JsonIgnoreprivate T data;private Boolean success;private String traceId;
}

验证输出结果为：