Fix http script for c8 example to complete correct task, closes #105

examples/java-c8/simple-process-demo.http

@@ -28,6 +28,7 @@ POST http://localhost:18082/simple-service-tasks/start-process?value={{correlati
 ### Get user tasks
 < {%
   import {wait} from "wait";
+
   console.log("waiting 5 secs");
   wait(5);
 %}
@@ -46,7 +47,11 @@ Accept: application/json
   })
 
   const tasks = response.body;
-  const taskId = jsonPath(tasks, "$[0].taskId");
+
+  const processInstanceId = client.global.get("instanceId")
+  const taskIds = jsonPath(tasks, "$[?(@.meta.processInstanceId == '" + processInstanceId + "')].taskId");
+  const taskId = jsonPath(taskIds, "$[0]");
+
   console.log("Created user task: ", taskId);
   client.global.set("taskId", taskId);
 %}
@@ -63,6 +68,7 @@ POST http://localhost:18082/simple-service-tasks/tasks/{{taskId}}/complete?value
 ### Correlate message
 < {%
   import {wait} from "wait";
+
   console.log("waiting 5 secs");
   wait(5);
 %}