[jira] Commented: (FELIX-2010) activate on component not called if specified in class and omitted from xml

["Felix Meschberger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-2010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805377#action_12805377 ] 

Felix Meschberger commented on FELIX-2010:
------------------------------------------

This works as designed and mandated by the DS 1.1 specification.

In the (initial) DS 1.0 specification, the activate (and deactivate) method had the signature

    [ protected | public ] void activate(ComponentContext);

Only with DS 1.1 has this been modified to allow for a number of different signatures.

For backwards compatibility reasons (see 112.11, Changes), this behaviour is only available for DS 1.1 (or later) components:

        The additional signatures and additional accessibility for the activate,
        deactivate, bind and unbind methods can cause problems for components
        written to version 1.0 of this specification. The behavior in this
        specification only applies to component descriptions using the v1.1.0
        namespace.

So, what you are experiencing is actually expected.

> activate on component not called if specified in class and omitted from xml
> ---------------------------------------------------------------------------
>
>                 Key: FELIX-2010
>                 URL: https://issues.apache.org/jira/browse/FELIX-2010
>             Project: Felix
>          Issue Type: Bug
>          Components: Declarative Services (SCR)
>    Affects Versions:  scr-1.4.0
>         Environment: Mac OS X
> java version "1.6.0_17"
> Java(TM) SE Runtime Environment (build 1.6.0_17-b04-248-10M3025)
> Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01-101, mixed mode)
>            Reporter: Christopher Brind
>
> The component descriptor does not have to explicitly specify the activate and deactivate methods.   However, if activate/deactivate are in the class then they should still be called at the appropriate time.
> So for example the following code only prints "Hello world!" when the activate method is specified explicitly in the component descriptor xml.
> public class FooComponent {
>         // the same seems to apply regardless of the signature
> 	public void activate() {
> 		System.out.println("Hello world!");
> 	}
> }
> This XML causes "Hello world!" to appear:
> <?xml version='1.0' encoding='utf-8'?>
> <component name='uk.org.brindy.felixscrtest.FooComponent' xmlns='http://www.osgi.org/xmlns/scr/v1.1.0' activate='activate'>
>   <implementation class='uk.org.brindy.felixscrtest.FooComponent'/>
> </component>
> But this XML does not:
> <?xml version='1.0' encoding='utf-8'?>
> <component name='uk.org.brindy.felixscrtest.FooComponent'>
>   <implementation class='uk.org.brindy.felixscrtest.FooComponent'/>
> </component>
> I could not quote a specific reference from the OSGi spec, but generally the latter example of XML is how the examples are structured (i.e. with implicit activate methods), for example see section 112.2.2 (Immediate Component) of the OSGi 4.2 compendium.

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