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Menu Class [message #1830219]

Tue, 21 July 2020 04:08

Mark Novem Grisola

Messages: 27
Registered: November 2017

Junior Member

Good day,

Just recently when i want to manipulate the visibility of the table menu by using the getMenuByClass( AddSample.menu).setVisible(Boolean.FALSE) it throws a null error: 2020-07-21 04:00:46,533 ERROR [scout-model-thread-22] org.eclipse.scout.rt.platform.exception.ExceptionHandler - NullPointerException:n/a -Ex: java.lang.NullPointerException: null
. So i switched to debug mode to trace the causes, when i check the AddSampleMenu.class on the Expressions tools of eclipse it exist. Why is it it throws a null error? What could be the other possible reason? By the way i am using version 10.0 of scout.

Sincerely,

mark

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Re: Menu Class [message #1830220 is a reply to message #1830219]

Tue, 21 July 2020 04:32

Mark Novem Grisola

Messages: 27
Registered: November 2017

Junior Member

Solved.

It turns out that menu is not accessible outside its parent class. If some point of the parent class a method which is outside of the class is invoke and part of the method is to manipulate the parent class menu that could raise a null error.

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Re: Menu Class [message #1830221 is a reply to message #1830220]

Tue, 21 July 2020 05:42

Andre Wegmueller

Messages: 204
Registered: September 2012
Location: Baden-Dättwil, Switzerla...

Senior Member

Hi Mark

Exactly. A typical getter method on the Form-class for a menu somewhere deep within the form looks like this:

public EditorLocaleFieldMenu getEditorLocaleFieldMenu() {
  return getTabBox().getMenuByClass(EditorLocaleFieldMenu.class);
}

In this example the form has a TabBox-field, and its menus are accessed via the TabBox reference.

Cheers
André

Eclipse Scout Homepage | Documentation | GitHub

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Re: Menu Class [message #1830225 is a reply to message #1830221]

Tue, 21 July 2020 07:23

Mark Novem Grisola

Messages: 27
Registered: November 2017

Junior Member

Thanks Andre, it further improve my understanding.

sincerely,
mark

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