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add some warnings for classpath file datasource

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You could use absolute path when you use File datasource & fat jar.
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祁晓波 2019-11-22 17:49:26 +08:00 committed by GitHub
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spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/readme.md
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@ -193,6 +193,18 @@ Now ReadableDataSource type support 5 categories: `file`, `nacos`, `zk`, `apollo
If you want to use `nacos`, `zk`, `apollo` or `redis` ReadableDataSource, you could add `sentinel-datasource-nacos`, `sentinel-datasource-zookeeper`,`sentinel-datasource-apollo` or `sentinel-datasource-redis` dependency.
## warning
You should use `file` ReadableDataSource in a fatjar carefully or you may get error like this below
```
java.lang.RuntimeException: [Sentinel Starter] DataSource ds1 handle file [classpath: flowrule.json] error: class path resource [flowrule.json] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:xxx/xxx.jar!/BOOT-INF/classes!/flowrule.jso
```
You could use absolute path when you use File datasource & fat jar.
It is recommended to use Nacos/Apollo/Zookeeper/Redis datasource to store rules.
https://github.com/alibaba/spring-cloud-alibaba/issues/428
When ReadableDataSource load rule data successfully, console will print some logs:
```
@ -203,4 +215,4 @@ When ReadableDataSource load rule data successfully, console will print some log
## More
For more information about Sentinel, see [Sentinel Project](https://github.com/alibaba/Sentinel).
If you have any ideas or suggestions for Spring Cloud Sentinel starter, please don't hesitate to tell us by submitting github issues.
If you have any ideas or suggestions for Spring Cloud Sentinel starter, please don't hesitate to tell us by submitting github issues.