Problems making a many-to-many relationship work across 2 microservices using Spring Boot & Hibernate

gistfile1.txt

Use case: assign an already existing task to an already existing user.
Yuo can assign multiple users at a time to 1 single task

post: /tasks/allocation/new

```json

{
  "task-id": 12345,
  "users": [
    {
      "username": "user-1",
      "user-id": "101"
    },
    {
      "username": "user-2",
      "user-id": "102"
    },
    {
      "username": "user-3",
      "user-id": "103"
    }
  ]
}
```

Post request is having one task and list of user-details to be allocated to that task.

@Data
public class TaskAllocation{
 @jsonProperty("task-id")
 private long taskId;
 @JsonProperty("users")
 private List<Users> userList;
}

public CompletableFuture<ResponseEntity<?>> assignTaskToUsers(@ResponseBody @Valid TaskAllocation taskAllocation){

  // service call

}

# -----------------------------------
Inside service:
1. fetch the task from task db
2. If needed, fetch detaisl of users from user-service(for each user)
3. For each user:
  1.Create new Allocation
  2. Set task Id
  3. Set user-id or username
  4. Save
  
Note: Task is already existing  

# Table Task-Allocation
----------------------------------------------------------------------
alloc-id(PK)         task-Id        user-id    timetamp     
----------------------------------------------------------------------
1                     12345         101         123123123123
2                     12345         102         123123123123
3                     12345         103         123123123123