How to pass args to Service task

[alef]

Hi all, I need to pass a custom object as arguments to a Service Task defined with type "Expression".
Assuming the expression is

#{myTask.doStuff(arg)}‍

, how can I do that?

Below the bean interface:

public class MyTask{
…
    public Integer doStuff(MyClass arg) {
    …
    }
}
‍‍‍‍‍‍‍

Thanks in advance.

[jbarrez]

well, exactly as you say, with ${myTask.doStuff(arg)}. If this bean is of course known to the engine (for example its a Spring bean in a spring environment)