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Eclipse Luna Problem with @Inject [message #1472084]

Thu, 13 November 2014 15:35

ludovic drouineau

Messages: 4
Registered: November 2014

Junior Member

Hello
I have created a new Eclipse 4 Application Project in Luna with a SamplePart:
The SamplePart has a samplePartActivated method with annotation Inject

@Inject
private void samplePartActivated(
@UIEventTopic(UIEvents.UILifeCycle.ACTIVATE) MPart activePart) {
if (activePart != null) {
System.out.println("Activation !!!!");
}
}

With Luna I have this exception:
org.eclipse.e4.core.di.InjectionException: Unable to process "SamplePart#samplePartActivated()": no actual value was found for the argument "MPart[@org.eclipse.e4.ui.di.UIEventTopic(value=org/eclipse/e4/ui/LifeCycle/activate)]".

The same code was working on juno.

Can anyone please help me?

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Re: Eclipse Luna Problem with @Inject [message #1472205 is a reply to message #1472084]

Thu, 13 November 2014 17:43

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Hi,

You need to:
a) use @Optional on the methpd or
b) use @Optional on the parameter

Tom

On 13.11.14 17:03, ludovic drouineau wrote:
> Hello
> I have created a new Eclipse 4 Application Project in Luna with a
> SamplePart:
> The SamplePart has a samplePartActivated method with annotation Inject
>
> @Inject
> private void samplePartActivated(
> @UIEventTopic(UIEvents.UILifeCycle.ACTIVATE) MPart
> activePart) {
> if (activePart != null) {
> System.out.println("Activation !!!!");
> }
> }
>
> With Luna I have this exception:
> org.eclipse.e4.core.di.InjectionException: Unable to process
> "SamplePart#samplePartActivated()": no actual value was found for the
> argument
> "MPart[@org.eclipse.e4.ui.di.UIEventTopic(value=org/eclipse/e4/ui/LifeCycle/activate)]".
>
>
> The same code was working on juno.
>
> Can anyone please help me?

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Re: Eclipse Luna Problem with @Inject [message #1472944 is a reply to message #1472205]

Fri, 14 November 2014 08:00

ludovic drouineau

Messages: 4
Registered: November 2014

Junior Member

Hi
I've done this and I don't have the exception but the parameter is always null:

@Inject
@Optional
private void samplePartActivated(
@UIEventTopic
(UIEvents.UILifeCycle.ACTIVATE) MPart activePart) {
if (activePart != null) {
System.out.println("Activation!");
}
else System.out.println("activePart is null!");
}

(In Juno, parameter was not null)

Ludo

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Re: Eclipse Luna Problem with @Inject [message #1477971 is a reply to message #1472944]

Tue, 18 November 2014 09:07

ludovic drouineau

Messages: 4
Registered: November 2014

Junior Member

Hi,
Should I avoid using
@UIEventTopic
(UIEvents.UILifeCycle.ACTIVATE) MPart activePart ?

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Re: Eclipse Luna Problem with @Inject [message #1478096 is a reply to message #1477971]

Tue, 18 November 2014 11:32

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Not 100% sure, but should the parameter type be org.osgi.service.event.Event instead of MPart when listening to the event.

I guess what you want to do is

@Inject
@Optional
public void receiveActivePart(@Named(IServiceConstants.ACTIVE_PART) MPart activePart) {
  if (activePart != null) {
  System.out.println("Active part changed "
    + activePart.getLabel());
  }
}

As explained here: http://www.vogella.com/tutorials/EclipseRCP/article.html#dependencyinjection_activeconstants

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