Question

I have been struggling very much with handling collection type response parameters in web services.

When response parameters are or normal type they are very easy to handle in the business processes. Here we are able to handle them as parameters on the Call web service process element. And use these in the process right away.

When there is a Collection which is returned, this is very different. Now the Call web service element parameter is of type Collection of Objects with attributes.

It seems to me that this parameter-type is very difficult to handle in the business process. I can't seem to find documentation in the Academy about how to extract and loop through the contents of the Collection of Objects with attributes.

What I have found in the academy is this article about setting up the Web service.
https://academy.bpmonline.com/documents/administration/7-14/adding-resp…

What I need to learn is how to handle them in bpm'online business processes.
Is there something about this in the Academy?
Is writing source code the only option? It's difficult to debug.

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3 comments

Dear Julius,

Unfortunately, it is impossible to handle parameters that have the “collection of object” type without using the source code.

Therefore, in this case we recommend using “ScriptTask” element for both calling the web-service and processing the results of call.

For more detailed assistance, please contact technical support.

Best regards,

Norton

Norton Lingard, Thank you. Is there anything like this in the academy? Because there is a special bpm'online syntax to go by in the source-code.

Dear Julius,

The service call in a "Script task” business process element can be implemented via native C#. Please find a lot of examples on how to do that in Google. For example, several links below:

https://stackoverflow.com/questions/9620278/how-do-i-make-calls-to-a-rest-api-using-c

https://code-maze.com/different-ways-consume-restful-api-csharp/

Please note that it is possible to use the native C# collections instead of working with the the special bpmonline collections.

Best regards,

Norton

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Question

Hi,

Is there a way to package an anonymus webservice created using the guide from the academy?

https://academy.bpmonline.com/documents/technic-sdk/7-13/creating-anony…

I need to have a public endpoint to integrate with a texting app that notifies of messages realtime, but the endpoint cant have authentication. Is there any other way to expose a public endpoint?

 

Regards,

Luciano

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5 comments

Hello Luciano,

Basically, to implement the anonymous webservice you should simply follow the instructions from the article that you sent. Anonymous webservice concept means that authentication is not a required step to interact with this service.
Also, if you use onsite version of bpm'online, don`t forget to register the service (there is an explanation how to do it in the article).
In case your site is located in cloud you should email support@bpmonline.com so the support team will help you with registration.

Best regards,
Alex

Alex_Tim,

Thank you for the answer, so the the package only contains the webservice class, the svc creation and .config changes are done by support, right?

Edit:

Additionally if also want to package this to make it available on the store, how would it work? do every customer that's bpm hosted needs to email support to get the webservice registered?

Regards,

Luciano

Luciano De Munno,

Hello, yes, you can create the webservice class in any package that you want.
Svc creation and changes in config should be done by support team. 

You can upload the package to the marketplace, but since changes should also be made in .config and svc files every customer will need to email support to register the webservice.

Best regards,
Alex

Alex_Tim,

Hi, do you know fi it's possible to use POST o r PUT instead of GET? whenever i put 

WebInvoke(Method = "POST") i keep getting 403

Luciano De Munno,

Hello! Error 403 means that there is no header with a CSRF token. To make a request using ARC, you need to add a header with a valid csrf token for the current session. You can get it, for example, by taking any post request from the network chrome tab. It is also better to put a header with cookies.
Read more about CSRF in the article:https://academy.bpmonline.com/documents/technic-sdk/7-13/protection-csrf-attacks-during-integration-bpmonline

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Question

I created a web service reference in GUI so I can call it from processes. I want to, depending on some settings, call a test version of this web service or a production version. Only their addresses differ. Is it possible to choose the address dynamically?

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2 comments

Dear Carlos,

You can create two web services in the system, one with test version URL, other with productive version URL.

Create a system setting, based on which you will decide test or production. Other solution is to use an Exclusive Gateway element, which wold determine which pass to choose. Each of the passes would lead to one Web Services Call element. 

The diagram should look somewhat like this:

Regards,

Anastasia

Anastasia Botezat,

Thank you. I hoped that I could avoid adding two web services but if that's the only option then I'll have to do that.

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Question

Is there a way to capture the Request message from a Call Web Service activity for debugging?

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3 comments

Dear Glenn,

You can use Fiddler to catch requests that are being sent to and from the application and use it for debbuging. But you will be able to do it starting from 7.13.2 version of the applciaiton. Until that you can either create the functionality and then use it after the upgrade or create the request on c# via a script task element.

Best regards,

Oscar

Oscar Dylan,

Both bpm'online and the service are in cloud, so I cannot use fiddler.  What is the target release for 7.13.2?

Dear Glenn,

You will be able to use fiddler to catch requests even if the instance is located on-cloud. As for 7.13.2 version - please take a look at release notes here https://academy.bpmonline.com/documents/bpmonline-release-notes-7-13-2.

Best regards,

Oscar

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Question

Hi Community,

we have the following problem, when we make a data load through the consumption of a "REST - WebService"

We would like to know how we could fix the "parse" error so that the execution does not fall ?. This happens when reading a JSON from the WebService.

 

 

 

Newtonsoft.Json.JsonException: Unexpected character while parsing path: 

   at Newtonsoft.Json.Linq.JsonPath.JPath.ParseMain()

   at Newtonsoft.Json.Linq.JToken.SelectToken(String path, Boolean errorWhenNoMatch)

   at Terrasoft.Services.Runtime.JsonResponseBodyParser.FillServiceParameterValues(IEnumerable`1 parameters, JToken responseToken, Dictionary`2 parameterValues)

   at Terrasoft.Services.Runtime.JsonResponseBodyParser.FillComplexArray(ServiceParameter parameter, JArray jsonArray)

   at Terrasoft.Services.Runtime.JsonResponseBodyParser.FillArrayValues(JToken token, ServiceParameter parameter, Type valueType)

   at Terrasoft.Services.Runtime.JsonResponseBodyParser.FillServiceParameterValues(IEnumerable`1 parameters, JToken responseToken, Dictionary`2 parameterValues)

   at Terrasoft.Services.Runtime.JsonResponseBodyParser.Parse(String body, Dictionary`2 dataAdapters)

   at Terrasoft.Services.Runtime.ServiceClientResponse.FillInBodyParameters(Dictionary`2 parameterValues)

   at Terrasoft.Services.Runtime.ServiceClientResponse.ParseResponse()

   at Terrasoft.Services.Runtime.ServiceClientResponse.get_ParameterValues()

   at Terrasoft.Services.WebServiceUserTaskImplementation.FillResponseParameters(IServiceClientResponse response, ProcessWebService userTask, IProcessParametersMetaInfo schema)

   at Terrasoft.Services.WebServiceUserTaskImplementation.Execute(ProcessWebService userTask, ProcessExecutingContext context)

   at Terrasoft.Core.Process.ProcessActivity.Execute(ProcessExecutingContext context)

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1 comments

Hello,

Basically, the error means that system receives an unexpected json object from web service.

If you use business process element "call web service" to make requests to external web service you should check web service settings.

In case you make a request to a web service via script task i.e. c# code, you should check your code for incorrect casts. 

Also you can simply catch requests and responses from web services via fiddler. With fiddler you are able to view headers, body and other request parameters.

Best regards,
Alex

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Question

When trying to call a web service from the BPM'Online platform, the process throws the following error: 

we assume that the error is due to the immense size of the JSON that we try to read from the external web service, so that the response would exceed the processing capacity limits of the webservice module of the bpm'online tool.
Our consulate is, if there is a way to increase the data processing limit of the bpm'online web service module in terms of reading the JSON delivered by the external web service.
We estimate that approximately 6 GB of RAM is needed to process the desired volume of data.

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2 comments

It doesn't seem to be a memory issue. Bpm'online provides up to around 8 GB RAM in critical moments and 4 GB by default. Anyway, If the application consumes more than around 8 GB RAM, IIS restarts it automatically. If you need more resources, please contact your account manager and the limits will be increased. 

It seems like the issue is related to a wrong JSON format. However, since the JSON is huge you'll not be able to debug it. In this case I recommend to create your own web service according to the article by the link below. 

https://academy.bpmonline.com/documents/technic-sdk/7-13/how-create-cus…

This way in case of the exception message you'll be able to create your own logging or debug the service on a local copy of the application. 

Please be aware of the fact that during the integration process that consumes almost all available RAM users might face performance issues. 

Thank you very much for the reply; it was indeed an error of the JSON that was being called, since it contained Null fields that did not correspond.

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Question

Hi,

When I am trying to send request from BPM (http://localhost:82) to external web app (https://localhost:58733) via 'call web service' system action I am getting an error:

"system.net.webexception could not establish secure channel for ssl/tls ---> system.security.authentication.authenticationexception the remote certificate is invalid"

What I am doing wrong? 'Call Web Service' system action should work with SSL/TLS without any problem?

Best regards,

Tom

 

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2 comments

I've used Call Web Service with SSL without issue. That error is a general .NET error that usually relates to issues with the certificate and likely means one of the following is true:

  • The certificate doesn't match the URL.
  • The certificate is self-signed and not added as a trusted certificate.
  • The certificate is expired.
  • The certificate is signed by a root certificate that's not installed on your machine.

If the cert is ok, and since this is a local install, you can try going to the external URL in IE (on the server where Bpm'online is installed), click the lock icon then "View Certificates", then click the button to "Install Certificate" (be sure you select to install on "Local Machine" and not "Current User"

Tom,

Please use this article to troubleshoot the issue https://blogs.msdn.microsoft.com/friis/2017/10/10/troubleshooting-tls-s… and also Ryan is right. The reason is probably in certificate so that's why you need to check it firstly.

Best regards,

Oscar

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