alibaba / alibaba/Sentinel

@SentinelResource ,how enable blockHandlerClass ,fallbackClass

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Dominant language
Java
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Description

## Issue Description
![image](https://user-images.githubusercontent.com/26543986/185030021-67229406-b5f1-4996-93ea-1ccc5a0e6d92.png)
![image](https://user-images.githubusercontent.com/26543986/185030055-ed897ac2-cecd-458e-9845-28daac89c983.png)
![image](https://user-images.githubusercontent.com/26543986/185030119-eede4d03-db1d-45a9-afdb-1779849f9cd0.png)
![image](https://user-images.githubusercontent.com/26543986/185030146-d10d7175-f6b2-43cc-91ec-3648bc163a9f.png)

### Describe what you expected to happen
how enabled blockHandlerClass ,fallbackClass

### How to reproduce it (as minimally and precisely as possible)

1.
2.
3.

### Tell us your environment
1、sentinel 1.8.3
2、springcloudalibaba 2021.0.1.0

Contributor guide

Open the contributing guide

Research direction

The issue names @SentinelResource, Sentinel 1.8.3, and Spring Cloud Alibaba 2021.0.1.0, but no source files, tests, or reproducible steps. Start by reading the @SentinelResource documentation and the integration behavior for blockHandlerClass and fallbackClass; done would require a clear supported configuration or documented usage path, with verification against the stated versions.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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