Re: How do I return the data I need from this Exception?

[Thomas Heller]

I see no code to ever call

 (timbre/log :trace (str  "in catch-exceptions our reply was: " reply))   

Probably just a copy error, other than that things look correct.

The JVM is complex, but strange things happening are pretty much always 
related to programmer errors.

If you add that line things should work as expected?

Cheers,
/thomas

On Thursday, October 8, 2015 at 8:35:18 AM UTC+2, Lawrence Krubner wrote:
>
> I'm thinking that I've misunderstood something about how to catch an 
> Exception. I have these 2 functions: 
>
> (defn catch-exceptions [e this-users-conversation]
>   (try 
> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
> (let [error (:object (ex-data e))
>   status (if (:status error)
>(:status error)
>500)
>   body (if (:body error)
>  (:body error)
>  (str e))
>   intent (if (:intent this-users-conversation)
>(:intent this-users-conversation)
>"api")
>   reply {:message body :status status :intent intent}]
>   reply)
> (catch Exception e (println "in catch-exceptions we triggered this 
> exception: " e
>
> (defn pull-response-from-query [this-users-conversation function-to-call]
>   "Formatting exceptions as Peter requested so the iPhone app only needs 
> to check the top-level status."
>   (try
> (function-to-call this-users-conversation)
> (catch Exception e (catch-exceptions e this-users-conversation
>
>
> Testing in the terminal, and feeding in garbage in a deliberate attempt to 
> trigger the exception, I see this line over and over again: 
>
> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
>
> but I never get this line: 
>
>   (timbre/log :trace (str  "in catch-exceptions our reply was: " 
> reply))
>
> nor do I ever see: 
>
> "in catch-exceptions we triggered this exception: "
>
> What am I doing wrong? 
>
>
>
>
>

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Re: How do I return the data I need from this Exception?

[Lawrence Krubner]

That the second logging line did not print when the first one did will 
continue to baffle me. There is absolutely no reason why that should 
happen. When a println statement goes missing the cause is usually 1 of 2 
things: the println was on a background thread, or there was an uncaught 
exception. But neither apply in this case. I am absolutely baffled. 

But I suppose it does not matter. The JVM is complex and sometimes strange 
things happen. I worked around the immediate issue with (throw) and I built 
a separation execution path to handle the exceptions that are thrown, but I 
don't like having this separate execution path. I want to bring the 
exception back into the normal flow of the program. I know there are 
libraries out there such as Hara/Ribol and I assume they do something like 
what I want. I can give them a look. 


On Thursday, October 8, 2015 at 4:01:14 AM UTC-4, Di Xu wrote:
>
> Well, I think you just misunderstand exception and try..catch expression.
>
> catch subexpression (in your case println) will evaluated only when try 
> subexpression (in your case log & let) throws exception.
>
> Thanks,
> Di Xu
>
> 2015-10-08 14:35 GMT+08:00 Lawrence Krubner  >:
>
>> I'm thinking that I've misunderstood something about how to catch an 
>> Exception. I have these 2 functions: 
>>
>> (defn catch-exceptions [e this-users-conversation]
>>   (try 
>> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
>> (let [error (:object (ex-data e))
>>   status (if (:status error)
>>(:status error)
>>500)
>>   body (if (:body error)
>>  (:body error)
>>  (str e))
>>   intent (if (:intent this-users-conversation)
>>(:intent this-users-conversation)
>>"api")
>>   reply {:message body :status status :intent intent}]
>>   reply)
>> (catch Exception e (println "in catch-exceptions we triggered this 
>> exception: " e
>>
>> (defn pull-response-from-query [this-users-conversation function-to-call]
>>   "Formatting exceptions as Peter requested so the iPhone app only needs 
>> to check the top-level status."
>>   (try
>> (function-to-call this-users-conversation)
>> (catch Exception e (catch-exceptions e this-users-conversation
>>
>>
>> Testing in the terminal, and feeding in garbage in a deliberate attempt 
>> to trigger the exception, I see this line over and over again: 
>>
>> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
>>
>> but I never get this line: 
>>
>>   (timbre/log :trace (str  "in catch-exceptions our reply was: " 
>> reply))
>>
>> nor do I ever see: 
>>
>> "in catch-exceptions we triggered this exception: "
>>
>> What am I doing wrong? 
>>
>>
>>
>>
>> -- 
>> You received this message because you are subscribed to the Google
>> Groups "Clojure" group.
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>> 
>> Note that posts from new members are moderated - please be patient with 
>> your first post.
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>>
>
>

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Re: How do I return the data I need from this Exception?

[Di Xu]

Well, I think you just misunderstand exception and try..catch expression.

catch subexpression (in your case println) will evaluated only when try
subexpression (in your case log & let) throws exception.

Thanks,
Di Xu

2015-10-08 14:35 GMT+08:00 Lawrence Krubner :

> I'm thinking that I've misunderstood something about how to catch an
> Exception. I have these 2 functions:
>
> (defn catch-exceptions [e this-users-conversation]
>   (try
> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
> (let [error (:object (ex-data e))
>   status (if (:status error)
>(:status error)
>500)
>   body (if (:body error)
>  (:body error)
>  (str e))
>   intent (if (:intent this-users-conversation)
>(:intent this-users-conversation)
>"api")
>   reply {:message body :status status :intent intent}]
>   reply)
> (catch Exception e (println "in catch-exceptions we triggered this
> exception: " e
>
> (defn pull-response-from-query [this-users-conversation function-to-call]
>   "Formatting exceptions as Peter requested so the iPhone app only needs
> to check the top-level status."
>   (try
> (function-to-call this-users-conversation)
> (catch Exception e (catch-exceptions e this-users-conversation
>
>
> Testing in the terminal, and feeding in garbage in a deliberate attempt to
> trigger the exception, I see this line over and over again:
>
> (timbre/log :trace (str  "in catch-exceptions our exception was: " e))
>
> but I never get this line:
>
>   (timbre/log :trace (str  "in catch-exceptions our reply was: "
> reply))
>
> nor do I ever see:
>
> "in catch-exceptions we triggered this exception: "
>
> What am I doing wrong?
>
>
>
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with
> your first post.
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How do I return the data I need from this Exception?

[Lawrence Krubner]

I'm thinking that I've misunderstood something about how to catch an 
Exception. I have these 2 functions: 

(defn catch-exceptions [e this-users-conversation]
  (try 
(timbre/log :trace (str  "in catch-exceptions our exception was: " e))
(let [error (:object (ex-data e))
  status (if (:status error)
   (:status error)
   500)
  body (if (:body error)
 (:body error)
 (str e))
  intent (if (:intent this-users-conversation)
   (:intent this-users-conversation)
   "api")
  reply {:message body :status status :intent intent}]
  reply)
(catch Exception e (println "in catch-exceptions we triggered this 
exception: " e

(defn pull-response-from-query [this-users-conversation function-to-call]
  "Formatting exceptions as Peter requested so the iPhone app only needs to 
check the top-level status."
  (try
(function-to-call this-users-conversation)
(catch Exception e (catch-exceptions e this-users-conversation


Testing in the terminal, and feeding in garbage in a deliberate attempt to 
trigger the exception, I see this line over and over again: 

(timbre/log :trace (str  "in catch-exceptions our exception was: " e))

but I never get this line: 

  (timbre/log :trace (str  "in catch-exceptions our reply was: " 
reply))

nor do I ever see: 

"in catch-exceptions we triggered this exception: "

What am I doing wrong? 




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