Cannot be cast to org.camunda.spin.plugin.variable.value.JsonValue

Camunda 7 Topics Discussion & Questions
1

Process Started with the following Input as Json.

{“variables”:{“customerData”:{“value”:“{"myDecision":"filevalidated"}”,“type”:“Json”}}}

Java Delegate

import org.camunda.spin.plugin.variable.value.JsonValue;
import org.camunda.spin.plugin.variable.value.impl.JsonValueImpl;
import org.camunda.spin.impl.json.jackson.JacksonJsonNode;
import static org.camunda.spin.Spin.*;

public class GetDetailsDelegate implements JavaDelegate {
	public void execute(DelegateExecution execution) throws Exception {
		
		JsonValue customer2 = execution.getVariableTyped("customerData");*
		System.out.println("GetDetailsDelegate---customer2---:"+customer2);
	}

}

When I am printing customer details as jsonvalue, I am getting following error.

java.lang.ClassCastException: org.camunda.spin.plugin.variable.value.impl.JsonValueImpl cannot be cast to org.camunda.spin.plugin.variable.value.JsonValue

2

Hi @somehanu,

can you please provide more information about your environment and the Camunda version.
Do you use a shared process engine?
What application server do you use?
Can you provide a failing test?

Maybe, it’s a problem with the class loading. Please check that library is loaded only once.

Best regards,
Philipp

3

Issue get solved by using the spin fasterxml object mapper as following. Because camunda treating json request as object

Imported Libraries;

import spinjar.com.fasterxml.jackson.core.JsonParseException;
import spinjar.com.fasterxml.jackson.databind.JsonMappingException;
import spinjar.com.fasterxml.jackson.databind.ObjectMapper;

Example Code:

Object customer = execution.getVariableTyped("customerData").getValue(); 
String customerValues = customer.toString();
ObjectMapper mapper = new ObjectMapper();
LoanDetail customers = mapper.readValue(customerValues, CustomerData.class);
1 Like
4

Hi.
I preffer add aditional rest endpoint.
You need add 2 files to project:

  1. JerseyConfig -
    @Component
    @ApplicationPath("/rest")
    public class JerseyConfig extends CamundaJerseyResourceConfig {

    @Override
    protected void registerAdditionalResources() {
    register(TaskFieldsService.class);
    }

  2. TaskFieldsService:

@Path("/taskfields")
public class TaskFieldsService {

@GET
@Produces(MediaType.APPLICATION_JSON)
@Path("{taskId}")
public String getFormFieldList(@Context HttpHeaders httpHeaders, @PathParam("taskId") String taskId ){


        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
        FormService formService = processEngine.getFormService();
        TaskFormData taskFormData = formService.getTaskFormData(taskId);
        List<FormField> formFieldList = taskFormData.getFormFields();
        System.out.println("Strike");
        String json = JSON(formFieldList).toString();
        return json;





};

}

So you can get form atributes by GET /taskfields/905