项目场景：

最近通过b站视频在学习dubbo（特别声明：b站真是个学习的地方，b站快打钱），用dubbo做了一个小demo（案例）
开发环境：Mac、IDEA

问题描述：

错误提示如下：意思是不能够调用这个方法，大家注意看我绿色箭头标注的那行错误提示…

Exception in thread "main" com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method getUserAddressList in the service com.gy.service.UserService. Tried 3 times of the providers [192.168.59.129:8083] (1/1) from the registry zoo1.superboss.cc:30002 on the consumer 192.168.59.129 using the dubbo version 2.6.2. Last error is: Failed to invoke remote method: getUserAddressList, provider: dubbo://192.168.59.129:8083/com.gy.service.UserService?anyhost=true&application=consumer-service-consumer&check=false&dubbo=2.6.2&generic=false&interface=com.gy.service.UserService&methods=getUserAddressList&pid=2150&register.ip=192.168.59.129&remote.timestamp=1603958286554&revision=1.0-SNAPSHOT&side=consumer&timestamp=1603958793263&version=1.0.0-ccc, cause: Failed to send response: Response [id=2, version=2.0.0, status=20, event=false, error=null, result=RpcResult [result=[com.gy.bean.UserAddress@7a2f0b78, com.gy.bean.UserAddress@7e1080e5], exception=null]], cause: java.lang.IllegalStateException: Serialized class com.gy.bean.UserAddress must implement java.io.Serializable
java.lang.IllegalStateException: Serialized class com.gy.bean.UserAddress 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.com.caucho.hessian.io.CollectionSerializer.writeObject(CollectionSerializer.java:99)
	at com.alibaba.com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:391)
	at com.alibaba.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.writeObject(Hessian2ObjectOutput.java:88)
	at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.encodeResponseData(DubboCodec.java:192)
	at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encodeResponse(ExchangeCodec.java:277)
	at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:73)
	at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:38)
	at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalEncoder.encode(NettyCodecAdapter.java:80)
	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:66)
	at org.jboss.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
	at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:776)
	at org.jboss.netty.channel.SimpleChannelHandler.writeRequested(SimpleChannelHandler.java:304)
	at com.alibaba.dubbo.remoting.transport.netty.NettyHandler.writeRequested(NettyHandler.java:98)
	at org.jboss.netty.channel.SimpleChannelHandler.handleDownstream(SimpleChannelHandler.java:266)
	...

原因分析：

在使用dubbo生产和消费的过程中，我们所用到的Java Bean一定要序列化，不然会报以上的问题

解决方案：

解决方法很简单，搜索UserAddress这个Java Bean ，让他继承Serializable并完成序列化操作。

public class UserAddress implements Serializable {

    private static final long serialVersionUID = -3560426973584607769L;

这里需要注意的是：在完成序列化操作后，我们要重新编译代码，如我是maven的项目，需要重新install发布到本地仓库，然后在消费者的pom依赖中重新导入（即加入了依赖）

将public-project 公共的Java Bean的项目依赖导入到提供者和消费者的pom依赖中，导入完毕最好重新编译一下maven项目


这样，当我们再重新启动提供者和消费者的项目，就可以在消费者项目中使用方法读取到数据啦，当然我们也可以在dubbo-admin（dubbo的管理控制台中看到提供者与消费者），dubbo-admin这个项目我也发布在博客中啦，大家可以点这里👉下载