Are we doing something wrong here? - NexJ Developer Community

This topic has 8 replies, 2 voices, and was last updated 8 years, 5 months ago by Owen Pond.

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July 6, 2016 at 1:54 pm #6928

Participant

We have come across something with format-message that we believe is a bug but wanted to ensure that we are not doing something that the framework considers incorrect. The problem occurs when a JSON format message contains a nested collection of messages. The format-message function will throw a class cast exception any time this structure exists.

(format-message
   (message 
      (: :class "JsonError")
      (: topObject
         (collection
            (message 
               (: innerObject
                  (collection
                     (message (: value "inner"))
                  )
               )
            )
            (: value "top")
         )
      )
   )
)

;Error: Error formatting the message "JsonError".
at nexj.core.integration.format.json.JSONMessageFormatter.format(JSONMessageFormatter.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at nexj.core.scripting.JavaMethod.invoke(JavaMethod.java:226)
at integration.lambda(library:integration:63)
Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to nexj.core.rpc.TransferObject
at nexj.core.integration.format.json.JSONMessageFormatter.formatCompositeMessagePart(JSONMessageFormatter.java:200)
at nexj.core.integration.format.json.JSONMessageFormatter.formatCompositeMessagePart(JSONMessageFormatter.java:219)
at nexj.core.integration.format.json.JSONMessageFormatter.format(JSONMessageFormatter.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)

(format-message

(message

(: :class "JsonError")

(: topObject

(collection

(message

(: innerObject

(collection

(message (: value "inner"))

)

(: value "top")

)

;Error: Error formatting the message "JsonError".

at nexj.core.integration.format.json.JSONMessageFormatter.format(JSONMessageFormatter.java:92)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at nexj.core.scripting.JavaMethod.invoke(JavaMethod.java:226)

at integration.lambda(library:integration:63)

Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to nexj.core.rpc.TransferObject

at nexj.core.integration.format.json.JSONMessageFormatter.formatCompositeMessagePart(JSONMessageFormatter.java:200)

at nexj.core.integration.format.json.JSONMessageFormatter.formatCompositeMessagePart(JSONMessageFormatter.java:219)

at nexj.core.integration.format.json.JSONMessageFormatter.format(JSONMessageFormatter.java:84)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

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July 6, 2016 at 2:03 pm #6936

Owen Pond
Participant

Just taking a quick look; it looks like you’re adding

(: value "top")

1

(: value "top")

to the “topObject” collection, without it being part of a message definition.

Let us know if that was the problem.

0
July 6, 2016 at 2:09 pm #6944

Rob Duda
Participant

No, value is part of topObject. I attached the message definition below. I also added the capture of the hints at that part of the code. I don’t know why my formatting above had the white-space stripped out, makes it hard to read.

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July 6, 2016 at 2:30 pm #6953

Owen Pond

Participant

When I format the code I still see this…

(format-message
   (message
      (: :class "JsonError")
         (: topObject
            (collection
               (message 
                  (: innerObject (collection (message (: value "inner")))))
                  (: value "top")
               )
            )
         )
      )
   )
)

(format-message

(message

(: :class "JsonError")

(: topObject

(collection

(message

(: innerObject (collection (message (: value "inner")))))

(: value "top")

)

And if I just execute the 1st level (message) function the output is this

#&lt;TO&lt;JsonError, @1154853637&gt;(
topObject={
   TO&lt;, @667875473&gt;(
      innerObject={
         TO&lt;, @86051842&gt;(
            value="inner"
         )
      }
   ),
   (value . "top")
})&gt;

#<TO<JsonError, @1154853637>(

topObject={

TO<, @667875473>(

innerObject={

TO<, @86051842>(

value="inner"

)

}

(value . "top")

})>

Which has a pair in the middle of the resulting transfer object. Is that what you are expecting?

I’ve attached a screen shot of the formatted code.

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July 6, 2016 at 5:17 pm #6963

Rob Duda

Participant

The message is intended to reproduce the actual problem we have experienced and was just thrown together so I could post the question. The JSON should look like so:

{"topObject":[{"value":"top"},{"innerObject":[{"value":"inner"}]}]}

1	{"topObject":[{"value":"top"},{"innerObject":[{"value":"inner"}]}]}

If I just tried parse-message on the above JSON and it indeed parses into a TO:

(parse-message "{\"topObject\":[{\"value\":\"top\"},{\"innerObject\":[{\"value\":\"inner\"}]}]}" "JsonError")

1	(parse-message "{\"topObject\":[{\"value\":\"top\"},{\"innerObject\":[{\"value\":\"inner\"}]}]}" "JsonError")

; #&lt;TO&lt;JsonError, @16867522&gt;(
   topObject={
      TO&lt;JsonError, @24611091&gt;(
         value="top"
      ),
      TO&lt;JsonError, @13136233&gt;(
         innerObject={
            TO&lt;JsonError, @26067884&gt;(
               value="inner"
            )
         }
      )
   }
)&gt;

; #<TO<JsonError, @16867522>(

topObject={

TO<JsonError, @24611091>(

value="top"

TO<JsonError, @13136233>(

innerObject={

TO<JsonError, @26067884>(

value="inner"

)

}

)

}

So why does the framework throw the exception if I try to use format-message?

July 6, 2016 at 5:28 pm #6971

Rob Duda
Participant

I do see your point though, here is the correct code for that message but I do end up with the same exception from the framework:

0

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July 6, 2016 at 6:03 pm #6987

Owen Pond

Participant

I was able to produce your expected JSON result using the following message definition

&lt;Message format="JSON"&gt;
   &lt;Parts&gt;
      &lt;Message maxCount="0" name="topObject"&gt;
         &lt;Parts&gt;
            &lt;Value name="value" type="string"/&gt;
            &lt;Message maxCount="0" name="innerObject"&gt;
               &lt;Parts&gt;
                  &lt;Value name="value" type="string"/&gt;
               &lt;/Parts&gt;
            &lt;/Message&gt;
         &lt;/Parts&gt;
      &lt;/Message&gt;
   &lt;/Parts&gt;
&lt;/Message&gt;

<Parts>

<Parts>

<Parts>

</Parts>

</Message>

</Parts>

</Message>

</Parts>

</Message>

And consuming it with the following

(format-message
   (message
      (: :class "JsonError")
         (: topObject
            (collection (message (: value "top") (: innerObject (collection (message (: value "inner"))))))
      )
   )
)

(format-message

(message

(: :class "JsonError")

(: topObject

(collection (message (: value "top") (: innerObject (collection (message (: value "inner"))))))

)

I’ll follow up a bit later with more explanation if this code works for you.

July 7, 2016 at 8:59 am #7009

Rob Duda
Participant

I do not get the same result using your code above. Perhaps the problem is fixed in your version of the product. If that’s the case I’ll have someone work with support to see if there is a hotfix we can get before our next release. November-ish timeframe.

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July 7, 2016 at 9:35 am #7019

Owen Pond
Participant

It turns out that is the case. There was a fix made that would handle this case and is currently included in 7.2

Support will be able to help you request a hotfix.

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