Can this handling of a null body in Apache Camel be more elegant?

Question

I'm new to Camel and trying to learn idioms and best practices. I am writing web services which need to handle several different error cases. Here is my error handling and routing: ``` onException(JsonParseException.class).inOut("direct:syntaxError").handled(true); onException(UnrecognizedPropertyException.class).inOut("direct:syntaxError").handled(true); // Route service through direct to allow testing. from("servlet:///service?matchOnUriPrefix=true").inOut("direct:service"); from("direct:service") .choice() .when(body().isEqualTo(null)) .inOut("direct:syntaxError") .otherwise() .unmarshal().json(lJsonLib, AuthorizationParameters.class).inOut("bean:mybean?method=serviceMethod").marshal().json(lJsonLib); ``` As you can see, I have special handling (content based routing) to deal with a request with a null body. Is there a way to handle this more elegantly? I'm writing several services of this type and it seems like they could be much cleaner.

Accepted Answer

You can use an interceptor, such as interceptFrom with a when, to check for the empty bod, as there is an example of here: http://camel.apache.org/intercept

And then use stop to indicate no further processing:

```
interceptFrom("servlet*").when(body().isNull()).to("direct:syntaxError").stop();
```

Can this handling of a null body in Apache Camel be more elegant?

Solution

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