@freeseawind I have check your point , `org.apache.dubbo.common.extension.ExtensionLoader#getExtension` spi value is required. The actual usage habits will specify a name
```
public T getExtension(String name) {
if (name == null || name.length() == 0)
throw new IllegalArgumentException("Extension name == null");
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2398 ]
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