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Moka: "Your first executable model" leads to nullpointer exception [message #1809182]

Wed, 10 July 2019 17:52

Rolf Schumacher

Messages: 60
Registered: January 2014

Member

I tried to get started with Moka, installed it to Eclipse 2019-06 from the update sites mentioned in Getting started with Moka. Downloaded File:BasicActiveObjectExample.zip, set a breakpoint and run in Debug. It led to Nullpointer exception.

It did not help to install everything fresh: eclipse modelling 2019-06, Papyrus from update-site, Moka by moving the Install button to the workspace. The nullpointer exception remains after start debugging. Is the example BasicActiveObjectExample compatible with these versions?

Should it work as described here?

Attachment: Screenshot from 2019-07-09 22-22-24.png
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Re: Moka: "Your first executable model" leads to nullpointer exception [message #1809258 is a reply to message #1809182]

Fri, 12 July 2019 13:54

Pauline Deville

Messages: 122
Registered: November 2016
Location: Paris Saclay, France

Senior Member

Hello,

How did you install moka, since I saw that the "Getting started with Moka" was not up to date I just update the update site and installation guide lines: https://wiki.eclipse.org/Papyrus/UserGuide/ModelExecution#Moka_Releases. To be on the best install to use Moka you should better use an eclipse 2019-03 version since this is the last version of Moka.

With this install I think that it should works if you create the factory as explain Your first executable model and you setup the launch configuration as explain in in Starting an execution with a launch configuration. We note that some part of this tutorial are not update anymore.

Which engine did you set in the launch configuration ? May be you should try org.eclipse.papyrus.moka.timedfuml.

HTH,
Best regards,
Pauline

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Re: Moka: "Your first executable model" leads to nullpointer exception [message #1809352 is a reply to message #1809258]

Sat, 13 July 2019 20:05

Rolf Schumacher

Messages: 60
Registered: January 2014

Member

Hi, Pauline
I tried several versions: 2019-06 with nightly, downloaded papyrus-2019-06-4.4.0 with moka installed from nightly, strictly modeling 2019-03 with moka installed from 4.0.0 update site, changed eclipse.ini to Java 1.8, it is always the same: Debugging starts with animation until "Set counter" is highlighted, then the null-pointer exception pops up.

I attached a short video to show what I experienced.

Any idea what to do next?

Rolf

Attachment: video_2019-07-13_21-58-11.mp4
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Re: Moka: "Your first executable model" leads to nullpointer exception [message #1809383 is a reply to message #1809352]

Mon, 15 July 2019 09:59

Pauline Deville

Messages: 122
Registered: November 2016
Location: Paris Saclay, France

Senior Member

Hi Rolf,

If the execution appear when the set counter is trigger, an explanation could be that the "Increment" instance is not initialize then the counter property equals "null". Are you sure you reference the factory into the Launch configuration and not the IncrementClassifierBehavior (see attach picture)? The goal of the factory is to create The Increment instance and initialize its property then call the ClassifierBhavior.

HTH,
Pauline