How can I get the process instance errors and save it into any process variable?

Question

Dear community, 
 I have a start process web api, the process is updating the metadata table. 
 My facing issue is that API response success even when write to data store entity error. 
 The expected result should be when process executing error, we can expose the process instance error in web api response body. 
 Therefore, how can I get the process instance error? then I can save it into process variable, and in the api, we can get it through ProcessInfo. 
 Thanks in advance for your answers.

Danny Verb · Answer

a!startProcess() has two parameters which help, onSuccess and onError. onError happens when a node in the process model runs into an execution error and onSuccess happens when the activity chaining for you process completes and none of those nodes hit an error. For your use case, it seems like you need to add an a!httpResponse() in the onError parameter.

Dave Lewis · Answer

Write to datastore also has an onError output that can be configured.

Komal Jain · Answer

Hi, 
 can you please try with this code 
 a!startProcess( processModel: cons!Process_model, processParameters: a!fromJson( http!request.body ), onSuccess: a!writeToDataStoreEntity( dataStoreEntity: cons!Datastoreentity, valueToStore: {}, onSuccess: a!httpResponse( statusCode: 200, headers: { a!httpHeader(name: "Content-Type", value: "application/json") }, body: a!toJson( fv!processInfo ) ), onError: a!httpResponse( statusCode: 500, headers: { a!httpHeader(name: "Content-Type", value: "application/json") }, body: a!toJson( { error: "There was an error recived while inserting data" } ) ) ), onError: a!httpResponse( statusCode: 500, headers: { a!httpHeader(name: "Content-Type", value: "application/json") }, body: a!toJson( { error: "There was an error starting the process" } ) ) ) 
 
 please user a!writetodatastore smartservice on success of a!startprocess and the error will be received in case failed