Caused by: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable

[tcxurun]

采用Dubbo集成Sentinel，资源是在Provider端，Consumer端调用，限流后进行压测报这个错误
Caused by: com.alibaba.dubbo.remoting.RemotingException: Failed to send response: Response [id=1338, version=2.0.0, status=20, event=false, error=null, result=RpcResult [result=null, exception=java.lang.reflect.UndeclaredThrowableException]], cause: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable
Java field: protected com.alibaba.csp.sentinel.slots.block.AbstractRule com.alibaba.csp.sentinel.slots.block.BlockException.rule
Java field: private java.lang.Throwable java.lang.reflect.UndeclaredThrowableException.undeclaredThrowable
java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable
Java field: protected com.alibaba.csp.sentinel.slots.block.AbstractRule com.alibaba.csp.sentinel.slots.block.BlockException.rule
Java field: private java.lang.Throwable java.lang.reflect.UndeclaredThrowableException.undeclaredThrowable

[sentinel-bot]

Hi @tcxurun, we detect non-English characters in the issue. This comment is an auto translation from @sentinel-bot to help other users to understand this issue.
We encourage you to describe your issue in English which is more friendly to other users.

Caused by: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable

Using Dubbo to integrate Sentinel, the resource is on the Provider side, the Consumer side is called, and the error is reported after the current limit is reported.
Caused by: com.alibaba.dubbo.remoting.RemotingException: Failed to send response: Response [id=1338, version=2.0.0, status=20, event=false, error=null, result=RpcResult [result=null, exception=java.lang.reflect.UndeclaredThrowableException]], cause: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable
Java field: protected com.alibaba.csp.sentinel.slots.block.AbstractRule com.alibaba.csp.sentinel.slots.block.BlockException.rule
Java field: private java.lang.Throwable java.lang.reflect.UndeclaredThrowableException.undeclaredThrowable
java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable
Java field: protected com.alibaba.csp.sentinel.slots.block.AbstractRule com.alibaba.csp.sentinel.slots.block.BlockException.rule
Java field: private java.lang.Throwable java.lang.reflect.UndeclaredThrowableException.undeclaredThrowable

[jasonjoo2010]

The root cause is the provider didn't deal with the BlockException while BlockException is not designed to be transmitted in RPC environment.

If you want to customize the fallback in provider side you can use DubboFallbackRegistry. setProviderFallback().

This issue is related to #1017

[wzg923]

Describe problem:
com.alibaba:dubbo:2.6.9
com.alibaba.csp:sentinel-dubbo-adapter:1.8.0
problem code

com.alibaba.csp.sentinel.adapter.dubbo.fallback.DefaultDubboFallback
public class DefaultDubboFallback implements DubboFallback {
    @Override
    public Result handle(Invoker<?> invoker, Invocation invocation, BlockException ex) {
        // Just wrap and throw the exception.
        throw new SentinelRpcException(ex);
    }
}

should change to :

public class DefaultDubboFallback implements DubboFallback {

    @Override
    public Result handle(Invoker<?> invoker, Invocation invocation, BlockException ex) {
        // Just wrap the exception.
        RpcResult result = new RpcResult();
        result.setException(ex.toRuntimeException());
        return result;
    }
}

[sczyh30]

@wzg923 Would you like to submit a PR to fix it?

[wzg923]

@wzg923 Would you like to submit a PR to fix it?

It's my pleasure, but I don't have the permission to push or create a new git branch

[sczyh30]

@wzg923 Would you like to submit a PR to fix it?

It's my pleasure, but I don't have the permission to push or create a new git branch

You may refer to https://github.com/alibaba/Sentinel/wiki/开源贡献指南