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Apache Dubbo Component

Java Samples (apache/dubbo-samples)

Dubbo Version

When changing the protocol of the Callback example in https://github.com/apache/dubbo-samples/tree/master/2-advanced/dubbo-samples-callback to use the Triple protocol the following error is thrown by the Consumer

Caused by: java.lang.UnsupportedOperationException: ObjectDeserializer[interface org.apache.dubbo.samples.callback.api.CallbackListener]
    at com.alibaba.com.caucho.hessian.io.ObjectDeserializer.readObject(ObjectDeserializer.java:76)
    at com.alibaba.com.caucho.hessian.io.AbstractDeserializer.readObject(AbstractDeserializer.java:127)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2956)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2289)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2218)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2262)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2218)
    at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:118)
    at org.apache.dubbo.common.serialize.DefaultSerializationExceptionWrapper$ProxyObjectInput.readObject(DefaultSerializationExceptionWrapper.java:161)

Steps to reproduce this issue

1) Change Provider https://github.com/apache/dubbo-samples/blob/master/2-advanced/dubbo-samples-callback/dubbo-samples-callback-provider/src/main/resources/application.yml to use the Triple protocol e.g.

dubbo:
  application:
    name: callback-provider

    serialize-check-status: DISABLE
    check-serializable: false

  registry:
    address: zookeeper://${zookeeper.address:127.0.0.1}:2181
  protocol:
    name: tri
    #name: dubbo
    port: 20880
  provider:
    token: true
    callbacks: 1000

2) Change Consumer https://github.com/apache/dubbo-samples/blob/master/2-advanced/dubbo-samples-callback/dubbo-samples-callback-consumer/src/main/resources/application.yml to use the Triple protocol e.g.

dubbo:
  application:
    name: callback-consumer
    qos-enable: false

    serialize-check-status: DISABLE
    check-serializable: false

  protocol:
    name: tri
    #name: dubbo
    port: -1
  registry:
    address: zookeeper://${zookeeper.address:127.0.0.1}:2181

The following exception is thrown by the Consumer 

Caused by: java.lang.UnsupportedOperationException: ObjectDeserializer[interface org.apache.dubbo.samples.callback.api.CallbackListener]
    at com.alibaba.com.caucho.hessian.io.ObjectDeserializer.readObject(ObjectDeserializer.java:76)
    at com.alibaba.com.caucho.hessian.io.AbstractDeserializer.readObject(AbstractDeserializer.java:127)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2956)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2289)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2218)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2262)
    at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2218)
    at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:118)
    at org.apache.dubbo.common.serialize.DefaultSerializationExceptionWrapper$ProxyObjectInput.readObject(DefaultSerializationExceptionWrapper.java:161)

What you expected to happen

I would expect the same behaviour as when the protocol is set to dubbo e.g Consumer log file to display

Changed: 2025-06-18 08:16:02
Changed: 2025-06-18 08:16:04
Changed: 2025-06-18 08:16:09
Changed: 2025-06-18 08:16:14

Anything else

No response

Are you willing to submit a pull request to fix on your own?

  • [ ] Yes I am willing to submit a pull request on my own!

Code of Conduct

Comment From: RainYuY

I believe this is a missing feature. If confirmed, I will try to implement the callback functionality for the Triple protocol later. @oxsean @AlbumenJ PTAL

Comment From: RainYuY

Callback is not currently planned for Triple. If your use case requires similar functionality, we recommend considering the stream mode as an alternative.