@carryxyh  yet , without you use @SPI or @adaptive , it providers extension 
name. Why you add @SPI into interface,  may be you want use extension loader 
feture. you can  also inject without container manager like 
`ExchangeHandler requestHandler = new ExchangeHandlerAdapter()`

but if you  use extension loader you must provider default extension name, may 
be you can check dubbo source code. The order of lookup is:@adaptive @SPI .If 
you not provider  @adaptive it will lookup @SPI . 

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2398 ]
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