Fetch Custom Exception from the exchange

[Echo]

Hello , 
I have declared my CustomException class. 
When the onException() catches it , it goes to the processor I defined : 

onException(classOf[CustomException]).process(doSmth) 

So far so good . 
The issue that I need into the processor to check if the exception is of
type "CustomException" or not 

when I write : 

 def process(exchange: Exchange) = { 
    val exception: CustomException=
exchange.getProperty(Exchange.EXCEPTION_CAUGHT, classOf[CustomException]) 

I got null 

But when I write : 

 def process(exchange: Exchange) = { 
    val exception: Exception =
exchange.getProperty(Exchange.EXCEPTION_CAUGHT, classOf[Exception]) 

I got my exception object 

How could I check which type of exception is thrown into the processor ! 

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