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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:
```