On Fri, Nov 15, 2013 at 5:13 AM, Goyal, Arpit <[email protected]> wrote:
> Hi Claus,
>
> Tried two approach but neither of them worked for me (based out of the URL -
> http://camel.apache.org/exception-clause.html) What I need is when the first
> When fails, camel should continue to execute the second When. Could you let
> me know where I am going wrong?
>
You cannot have Camel fallback and pick a 2nd when, its just like if
.. else cannot do that
if a
....
try {
exception happens here
} catch (Exception e)
.. // you cannot either do this in java to catch an exception
here, and then continue in the 2nd if (eg else if b)
}
else if b
...
else if c
> Option 1: Defined the onException clause after the camel:xpath expression.
> Getting exception " OnException[[class
> org.apache.camel.builder.xml.InvalidXPathExpression] -> []] is not
> configured. "
>
> <camel:route>
>
> <camel:from ref="Sender"/>
> <camel:setHeader headerName="MyHeader">
> <camel:constant>GOOD</camel:constant>
> </camel:setHeader>
> <camel:choice>
>
> <camel:when>
> <camel:xpath>//MessageId = 'a'</camel:xpath>
>
> <camel:onException>
> <camel:exception>org.apache.camel.builder.xml.InvalidXPathExpression</camel:exception>
> <camel:continued><camel:constant>true</camel:constant></camel:continued>
> </camel:onException>
>
> <camel:to ref="Receiver1_"/>
> </camel:when>
>
> <camel:when>
> <camel:simple>${header.MyHeader} == 'GOOD'</camel:simple>
> <camel:to ref="Receiver_"/>
> </camel:when>
>
> <camel:otherwise/>
>
> </camel:choice>
> </camel:route>
>
> Option 2: Define the onException clause inside the camel context. Here two it
> doesn't work. After exception occurs, the processing stops successfully.
> Instead I need the second condition to be evaluated.
>
> <camel:camelContext id="TryCatchEval">
> <camel:onException>
>
> <camel:exception>org.apache.camel.builder.xml.InvalidXPathExpression</camel:exception>
>
> <camel:continued><camel:constant>true</camel:constant></camel:continued>
> </camel:onException>
>
> <camel:route>
>
> <camel:from ref="Sender"/>
>
> <camel:setHeader headerName="MyHeader">
> <camel:constant>GOOD</camel:constant>
> </camel:setHeader>
>
> <camel:choice>
>
> <camel:when>
> <camel:xpath>//MessageId = 'a'</camel:xpath>
> <camel:to ref="Receiver1_"/>
> </camel:when>
>
> <camel:when>
> <camel:simple>${header.MyHeader} == 'GOOD'</camel:simple>
> <camel:to ref="Receiver_"/>
> </camel:when>
>
> <camel:otherwise/>
>
> </camel:choice>
>
> </camel:route>
> </camel:camelContext>
>
> Regards,
> Arpit
> -----Original Message-----
> From: Claus Ibsen [mailto:[email protected]]
> Sent: Thursday, November 14, 2013 2:58 PM
> To: [email protected]
> Subject: Re: Try-Catch in choice-when
>
> Use <onException> instead of try .. catch as that is better.
>
> On Wed, Nov 13, 2013 at 2:15 PM, Goyal, Arpit <[email protected]> wrote:
>> Any idea how can I achieve the following?
>>
>> -----Original Message-----
>> From: Goyal, Arpit [mailto:[email protected]]
>> Sent: Wednesday, November 13, 2013 9:42 AM
>> To: [email protected]
>> Subject: Try-Catch in choice-when
>>
>> Hi All,
>>
>> I am trying to use Try-Catch inside 'when' but not sure how to get it right.
>> I am using BLUEPRINT DSL. Following is my route:
>>
>> <camel:route>
>> <camel:from ref="Sender"/>
>>
>> <camel:setHeader headerName="MyHeader">
>> <camel:constant>GOOD</camel:constant>
>> </camel:setHeader>
>>
>> <camel:choice>
>> <camel:when>
>> <camel:doTry>
>> <camel:xpath>//MessageId = 'a'</camel:xpath>
>> <camel:to ref="Receiver1"/>
>> <camel:doCatch>
>>
>> <camel:exception>org.apache.camel.builder.xml.InvalidXPathExpression</camel:exception>
>> <camel:to
>> uri="log:TryCatchEval?level=INFO"/>
>> </camel:doCatch>
>> </camel:doTry>
>> </camel:when>
>> <camel:when>
>> <camel:simple>${header.MyHeader} == 'GOOD'</camel:simple>
>> <camel:to ref="Receiver_"/>
>> </camel:when>
>> <camel:otherwise/>
>> </camel:choice>
>> </camel:route>
>>
>> Here the prefix camel stands for
>> xmlns:camel=http://camel.apache.org/schema/blueprint
>>
>> Basically the idea which we want to achieve is, in case my first condition
>> fails (due to some exception), I want to execute the second condition and
>> have hard restriction that I can't change my pattern of choice-when.
>>
>> As per the camel-blueprint xsd
>> (http://camel.apache.org/schema/blueprint/camel-blueprint-2.11.2.xsd),
>> whenDefinition expects first element to be some language element and then
>> allows Try-Catch. What if the language it-self throws exception? How can I
>> prevent that?
>>
>> Regards,
>> Arpit.
>
>
>
> --
> Claus Ibsen
> -----------------
> Red Hat, Inc.
> Email: [email protected]
> Twitter: davsclaus
> Blog: http://davsclaus.com
> Author of Camel in Action: http://www.manning.com/ibsen
--
Claus Ibsen
-----------------
Red Hat, Inc.
Email: [email protected]
Twitter: davsclaus
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen
