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Invoking UMLUtil as Native Object fails [message #1765690]

Tue, 13 June 2017 08:27

Eclipse User

Hi all,
I am trying to access the methods provided by UMLUtil during the executionn of a EGL file.

I now that java code can be invoked Native object as shown here

https://www.eclipse.org/epsilon/examples/index.php?example=org.eclipse.epsilon.examples.calljava

I copy pasted the code on this page within my EGL file and it works smoothly

var frame = new Native("javax.swing.JFrame");
frame.setBounds(100,100,200,200);
frame.title = "Opened from EOL";
frame.visible = true;

then I added the a new Native variable

var frame = new Native("javax.swing.JFrame");
var umlutil = new Native("org.eclipse.uml2.uml.util.UMLUtil");
frame.setBounds(100,100,200,200);
frame.title = "Opened from EOL";
frame.visible = true;

and EPSILON does not find the object.

My eclipse installation includes Papyrus and many other modeling tools so I suppose that the referenced object and library is included in my installation.

I need UMLUtil to invoke getBaseElement(). I know that I can do that by accessing base_<metaclass name> attribute of stereotype applications but I prefer to go through UMLUtil.

Thanks for any help.
Best,
Luca

[Updated on: Tue, 13 June 2017 08:38] by Moderator

Re: Invoking UMLUtil as Native Object fails [message #1765691 is a reply to message #1765690]

Tue, 13 June 2017 08:49

Eclipse User

Hi Luca,

You will need to declare UMLUtil as a "tool" using Epsilon's respective extension point as demonstrated in [1]. This is necessary due to the way Eclipse/OSGi manages classloaders (i.e. since the EOL engine plugin doesn't depend on the UML plugins, its classloader cannot access/load classes from the latter out of the box).

Cheers,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/articles/call-java-from-epsilon/

[Updated on: Tue, 13 June 2017 10:37] by Moderator

Re: Invoking UMLUtil as Native Object fails [message #1772780 is a reply to message #1765691]

Fri, 15 September 2017 04:16

Eclipse User

Thanks a lot for your help. It solved my problems.

Cheers,
Luca

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