Eclipse Community Forums: Eclipse 4 » Dependency injection of fields

Help

Home

Home » Eclipse Projects » Eclipse 4 » Dependency injection of fields

Show: Today's Messages :: Show Polls :: Message Navigator

Dependency injection of fields [message #897075]

Sat, 21 July 2012 13:18

Markus Oley

Messages: 304
Registered: July 2009
Location: Germany

Senior Member

Hi to anyone,

I have a Part and want to use dependency injection for inject some fields:

public class PreviewEditorPart {
  @Inject
  private PreviewEditorContent previewEditorContent

}

But somehow this is null if I want to do something in constructor.
If I add this to constructor and do a this.previewEditorContent = ...
it works, but I don't want to change signature.

Do I have another possibility to inject this?
Why isn't my field injected although I have a @Inject?

The constructor contains a reference to the mother - composite. Do I get this somehow by injection to avoid the necessary of having a constructor other than the default-constructor

Thank you for your help

Best regards
Markus

[Updated on: Sat, 21 July 2012 13:20]

Report message to a moderator

Re: Dependency injection of fields [message #897085 is a reply to message #897075]

Sat, 21 July 2012 14:39

Eclipse User

Field injections are performed only after the object is fully created, which is after the constructor returns.

You can either do the injection as a parameter of the constructor or create another method and annotate it with @PostConstruct. This annotated method will be called by the framework right after the constructor returns AND the injector has performed all field injections. Also this method is called only once in the object lifecycle.

Report message to a moderator

Re: Dependency injection of fields [message #897105 is a reply to message #897085]

Sat, 21 July 2012 20:30

Markus Oley

Messages: 304
Registered: July 2009
Location: Germany

Senior Member

Hi Sopot,

thank you for your solutions,

Best regards
Markus

Report message to a moderator

Previous Topic:	What UI-classes to use, if I want to use a JavaFX-Renderer
Next Topic:	E4 Problems with injecting a field that is a subclass of composite

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Tue Apr 23 15:42:29 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter