Hello,
i’am trying to instantiate a processinstance with a message start event. This is my example: pizza_order.bpmn (9.9 KB)
The Java delegate, which is implementing “Order pizza”-sending task has to create a new processinstance with that order. The code is as follows:
public class SendPizzaOrder implements JavaDelegate {
@Override
public void execute(DelegateExecution delegateExecution) throws Exception {
RuntimeService runtimeService = delegateExecution.getProcessEngineServices().getRuntimeService();
PizzaOrder pizzaOrder = new PizzaOrder("Pizza Funghi", 2);
// serialize complex object
ObjectValue pizzaOrderSerialized = Variables.objectValue(pizzaOrder)
.serializationDataFormat(Variables.SerializationDataFormats.JSON) // also tried it with JAVA
.create();
VariableMap variablesToSend = Variables.createVariables()
.putValueTyped("order", pizzaOrderSerialized); // I have also tried putValue
// Set variable in order to compare it later with the delivered pizza
delegateExecution.setVariable("order", pizzaOrderSerialized);
Map<String, Object> variables = runtimeService.getVariables(delegateExecution.getProcessInstanceId());
// Testing the deserialization, works fine)
PizzaOrder order = (PizzaOrder) variables.get("order");
// Start processinstance with message - works fine!
runtimeService.startProcessInstanceByMessage("Pizzabestellung", variablesToSend);
}
}
This is my order Object:
public class PizzaOrder implements Serializable {
private String pizzaname;
private int numberOfPizzas;
public PizzaOrder(String pizzaname, int numberOfPizzas) {
this.pizzaname = pizzaname;
this.numberOfPizzas = numberOfPizzas;
}
public String getPizzaname() {
return pizzaname;
}
public void setPizzaname(String pizzaname) {
this.pizzaname = pizzaname;
}
public int getNumberOfPizzas() {
return numberOfPizzas;
}
public void setNumberOfPizzas(int numberOfPizzas) {
this.numberOfPizzas = numberOfPizzas;
}
}
The (process-vendor) processinstance is instantiated as i want, but i can’t get an access to the process variable. For simple types it is working well, but not for a complex type as the PizzaOrder object. When i try this:
Map<String, Object> variablesOfVerkauf = processEngine().getRuntimeService()
.getVariables(<process-vendor-processInstanceId>);
I’am getting the deserialization-error for both SerializationFormats (JSON, JAVA). As you can see in the delegate, the deserialization worked fine, but not in the newly created vendor-instance:
13:07:35.195 [main] ERROR org.camunda.bpm.engine.context - ENGINE-16004 Exception while closing command context: Cannot deserialize object in variable ‘order’: SPIN/JACKSON-JSON-01006 Cannot deserialize ‘{"pizzaname’ to java type ‘[simple type, class org.model.PizzaOrder]’
org.camunda.bpm.engine.ProcessEngineException: Cannot deserialize object in variable ‘order’: SPIN/JACKSON-JSON-01006 Cannot deserialize ‘{"pizzanam…’ to java type ‘[simple type, class org.model.PizzaOrder]’
What i’am doing wrong here?
Thanks a lot for your help! 