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- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.7
* Operating System version: win10
* Java version: 1.8

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Behavior

<!-- What do you expect from the above steps？-->

### Actual Behavior

<!-- What actually happens? -->

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

}
    public int getCode() {
        return code;
    }
    public void setCode(int code) {
        this.code = code;
    }
    public boolean isBiz() {
        return code == BIZ_EXCEPTION;
    }
    public boolean isForbidden() {
        return code == FORBIDDEN_EXCEPTION;
    }
    public boolean isTimeout() {
        return code == TIMEOUT_EXCEPTION;
    }
    public boolean isNetwork() {
        return code == NETWORK_EXCEPTION;
    }
    public boolean isSerialization() {
        return code == SERIALIZATION_EXCEPTION;
    }
    public boolean isNoInvokerAvailableAfterFilter() {
        return code == NO_INVOKER_AVAILABLE_AFTER_FILTER;
    }
    public boolean isLimitExceed() {
        return code == LIMIT_EXCEEDED_EXCEPTION || getCause() instanceof LimitExceededException;
    }
}