Invalid Path error from http binding

Add-ons Bindings
,
1

I am using the http binding to read data from a webserver. The data comes across in JSON. I have been doing this without issues for at least a year. All of a sudden in the past three days my log is full of errors (see bottom).

The errors first cropped up around three days ago and I thought I initially resolved it with a reboot, however today it has occurred again. This time the errors resolved on their own without a reboot, so I suspect it isn’t anything on my end.

I’m not sure if I am reading this correctly - could the log be saying that the data does not exist ie it was not sent from the webserver?

 21:19:38.490 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.amOn)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.amOn' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:38.570 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.mode)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.mode' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:38.590 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.tempTarget)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.tempTarget' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:38.633 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.fanSpeed)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.fanSpeed' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:42.836 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.amOn)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.amOn' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:42.907 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.mode)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.mode' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:42.918 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.tempTarget)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.tempTarget' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
21:19:42.961 [WARN ] [hab.binding.http.internal.HttpBinding] - Transformation 'JSONPATH($.data.last_data.DA.fanSpeed)' threw an exception. [response=An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0]
org.openhab.core.transform.TransformationException: Invalid path '$.data.last_data.DA.fanSpeed' in 'An internal server error prevented this request from being successfully processed.  Error Reference: 43e7f619-55e2-4b78-909f-b9fbe72ce6e0'
    at org.openhab.core.transform.TransformationHelper$TransformationServiceDelegate.transform(TransformationHelper.java:67) ~[197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.binding.http.internal.HttpBinding.execute(HttpBinding.java:194) [236:org.openhab.binding.http:1.13.0]
    at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:144) [197:org.openhab.core.compat1x:2.4.0]
    at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:166) [197:org.openhab.core.compat1x:2.4.0]
2

Depending how you are using HTTP, wouldn’t you expect to detect a no response in some other way? More likely the response is valid but not suitable for your transformation, example “Please wait”

3

Hi @rossko57

Do you think this is what the webserver is sending back?

4

Correct, this is the message you recieve and try to decode. The transformationservice doesn’t find the pattern and creates the warn message.

5

Thanks @opus

Just a query: the Reference: part of the response is dynamic. Do you know if it is possible to capture only the first part of the response?

6

No, you get it all, however using a rule you can do whatever is needed.