Issue #6481 has been updated by Owsiak Michal.

Hello Jianwu,

it worked for me.

Thanks!

I will do additional testing with this flag and check whether it works fine 
with our workflows

Cheers

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Bug #6481: strange issue with MultipleTabDisplay actor and with Display like 
actors in general (missing output port in non-gui mode)
https://projects.ecoinformatics.org/ecoinfo/issues/6481#change-21596

* Author: Owsiak Michal
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* Bugzilla-Id: 
----------------------------------------
Hi there,

I will paste here description that already went to Jianwu via e-mail, but I 
think it describes the issue in details:

Some time ago we have published our patches to MultipleTabDisplay actor so it 
is consistent with new way of redirecting output.

The issue here is, that we have problem with running Kepler workflows in 
non-gui mode.

The issue lays in missing "output" port inside Multiple Tab Display actor.

The problem is that in GUI mode, everything works just fine (see the screen 
shoot).

In non-gui mode, we are getting an exception (see the attachment - 
exception.txt).

Command line used for starting workflow is:

./kepler.sh -runwf -nogui -nocache ~/Desktop/testMTD.xml

Problematic workflow was reduced, and now, we have smallest case that triggers 
exception.

The workflow is inside: testMTD.xml.

The problem occurs in case Multiple Tab Display actor is inside Composite 
actor. If the MTD is placed on main workflow, everything is just fine.

If we start testMTD workflow in GUI mode - everything is OK.
If we start it following way:

./kepler.sh -runwf -nogui -nocache testMTD.xml

We are getting exception.

I have done some initial debugging, and it looks like issue lies in reading 
output port from the actor. It is not reported in the code.

Entity.java class has method: getPort. In this method, if I take a look at the 
code, I can see that variable "_portList" doesn't contain "output" port.

This is what I can see while running Kepler in Eclipse (non-gui mode of Kepler)

[
 ptolemy.actor.TypedIOPort
  {.testMTD.CompositeActor.MultipleTabDisplay.input},
 ptolemy.actor.TypedIOPort
  {.testMTD.CompositeActor.MultipleTabDisplay.trigger}
]

This is the code, that should return "output" port.

 public Port getPort(String name) {
        try {
            _workspace.getReadAccess();
            return (Port) _portList.get(name);
        } finally {
            _workspace.doneReading();
        }
    }

"_portList" doesn't contain output port, even though, this port is visible in 
GUI mode, and - in fact - works fine (take a look at screen shot).

The question here is. Where should we look for the bug? Do you have any 
suggestions? 


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