最近遇到了两个序列化相关的问题，比较典型，备忘特此留笔。
1.rpc调用时未进行序列化而导致的rpc调用失败
使用dubbo框架在进行rpc调用的时候，出现了下面的问题，原因是因为接口参数中的NoSerialReqDto类没有实现Serializable接口，没有进行序列化导致的。
Caused by: java.lang.IllegalStateException: Serialized class com.your.package.domain.NoSerialReqDto must implement java.io.Serializable at com.alibaba.com.caucho.hessian.io.SerializerFactory.getDefaultSerializer(SerializerFactory.java:395) at com.alibaba.com.caucho.hessian.io.SerializerFactory.getSerializer(SerializerFactory.java:369) at com.alibaba.com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:389) at com.alibaba.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.writeObject(Hessian2ObjectOutput.java:88) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.encodeRequestData(DubboCodec.java:176) at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:234) at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:71) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:38) at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalEncoder.encode(NettyCodecAdapter.java:80) at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:66) at com.alibaba.dubbo.remoting.transport.netty.NettyHandler.writeRequested(NettyHandler.java:98) at org.jboss.netty.channel.Channels.write(Channels.java:611) at org.jboss.netty.channel.Channels.write(Channels.java:578) at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:251) at com.alibaba.dubbo.remoting.transport.netty.NettyChannel.send(NettyChannel.java:100) ... 127 common frames omitted
2.jackson序列化时Map对象中的key不能为Null
Spring Boot中使用Jackson将对象进行序列化时，如果Map对象中的key为null时，会报下面的错误，找到响应的null key，然后将其过滤掉或者进行处理后便可以了。
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?) (through reference chain: net.your.package.dto.Result["data"]->net.your.package.TestNullKeyDto["testNullKey"]->net.your.package.TestNullKeyDto["quantity"]) at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284) at com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1251) at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1145) at com.fasterxml.jackson.databind.ser.impl.FailingSerializer.serialize(FailingSerializer.java:35) at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFieldsUsing(MapSerializer.java:803) at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:637) at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.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.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.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.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:286) ... 91 common frames omitted
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