采用点对点直连方式，dubbo-samples-callback运行的时候报错

[kewang85]

采用点对点直连方式的时候，dubbo-samples-callback运行的时候报org.apache.dubbo.samples.callback.CallbackServiceIT$$Lambda$132/0x0000000801328440 must implement java.io.Serializable

Environment

• Dubbo version: 2.7.3
• Operating System version:macOS 0.14.5
• Java version: 1.8.0_191

Steps to reproduce this issue

1. 将spring/callback-provider.xml中的registry修改为
2. 将spring/callback-consumer.xml中的registry删掉，dubbo:reference中增加url="dubbo://127.0.0.1:20880"
3. 启动provider再启动consumer

报如下异常： Caused by: java.lang.IllegalStateException: Serialized class org.apache.dubbo.samples.callback.CallbackServiceIT$$Lambda$132/0x0000000801328440 must implement java.io.Serializable at com.alibaba.com.caucho.hessian.io.SerializerFactory.getDefaultSerializer(SerializerFactory.java:401) at com.alibaba.com.caucho.hessian.io.SerializerFactory.getSerializer(SerializerFactory.java:375) at com.alibaba.com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:389) at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.writeObject(Hessian2ObjectOutput.java:89) at org.apache.dubbo.rpc.protocol.dubbo.DubboCodec.encodeRequestData(DubboCodec.java:185) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:238) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:69) at org.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40) at org.apache.dubbo.remoting.transport.netty4.NettyCodecAdapter$InternalEncoder.encode(NettyCodecAdapter.java:70) at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ... 24 more

[LiosWong]

I am running locally, no error

[anLA7856]

你可以检查下 你的 provider 端是否配置了 callback 参数，如果没有配置，当consumer 从 注册中心读取数据时候，是不会再url中写入参数回调信息的，所以就回走Hessian 的setObject ，也就是会检查序列化。而匿名内部类没有实现序列化，所以报错。

[CrazyHZM]

No feedback for a long time, please close the issue temporarily. If there is still a problem, you can reopen it.