REST API vs Java API --- I need some help

Camunda 7 Topics Discussion & Questions
1

Hi All,

Honestly speaking I have been digging/searching on this forums before posting my question here but I could not find exactly what I need; I need to extract a huge amount of information for reporting purposes using the Java API (I need to create a single file with a lot of information).

Could you please tell me what’s the Java API call equivalent to the following REST-API calls? As follows:

Below is the URL which gives the process instance list:
/rest/process-instance

if you want to see particular process:
/rest/process-instance/{id}

Get Variables History for All for Process Instance
/rest/history/variable-instance

Get Variables History with Current filter by Process ID
/rest/history/variable-instance?processInstanceIdIn={id}

Get Current Task Variables by Process ID
/rest/variable-instance?processInstanceIdIn?processInstanceIdIn={id}

Get All Task History for all Process ID
/rest/history/task

Get All Active Task
/rest/task

Get All Task History filter by Process ID
/rest/history/task?processInstanceIdIn={id}

Get Current Task filter by Process ID
/rest/task?processInstanceIdIn={id}

Get All Process Instance Id History
/rest/history/process-instance

In advance, thanks a lot, your help is highly appreciated.

2

@psilvaricardo, you can find in this example how to access process engine services. There are many ways to access process engine services.

@Component
public class CamundaServices{

	@Autowired
	private ProcessEngineService processEngineService;

	public void getServiceData(String engine) {
		ProcessEngine processEngine = processEngineService.getProcessEngine(engine);
		processEngine.getRuntimeService().createProcessInstanceQuery().active().list();
		processEngine.getRuntimeService().createProcessInstanceQuery().processInstanceId("processInstanceId").singleResult();
		processEngine.getHistoryService().createHistoricVariableInstanceQuery().list();
		processEngine.getHistoryService().createHistoricVariableInstanceQuery().processInstanceId("processInstanceId").singleResult();
		processEngine.getHistoryService().createHistoricTaskInstanceQuery().list();
		processEngine.getHistoryService().createHistoricProcessInstanceQuery().list();
		processEngine.getHistoryService().createHistoricTaskInstanceQuery().processInstanceId("processInstanceId").singleResult();
		processEngine.getTaskService().createTaskQuery().list();
		processEngine.getTaskService().createTaskQuery().processInstanceId("processInstanceId").singleResult();
	}	
}
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3

Hi @aravindhrs

I really appreciate your help with this, seems that, this could be the JAVA APIs I was looking for, I will be doing some tests and I will share my results shortly.

Thank you
Best regards.

4

Hi @psilvaricardo,

you can have a look into the original implementation of the rest api: https://github.com/camunda/camunda-bpm-platform/tree/master/engine-rest/engine-rest

It’s just a wrapper around the java api and it’s open source :wink:

Hope this helps, Ingo

1 Like
5

@Ingo_Richtsmeier Thanks for your feedback