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https://issues.apache.org/jira/browse/FELIX-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991242#comment-12991242
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Richard S. Hall commented on FELIX-2815:
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Think of standard Java, you can define a class as implementing some interface.
However, this is not sufficient to actually use the class, you need to use
"new" to create an instance. This is the same with iPOJO components. You define
the <component> (i.e., the type) and say that it <provides> some service (i.e.,
the interfaces it implements) , but this just defines the component type. You
still need to create an instance of the component.
> Difference between "instance" and "provides"
> --------------------------------------------
>
> Key: FELIX-2815
> URL: https://issues.apache.org/jira/browse/FELIX-2815
> Project: Felix
> Issue Type: Bug
> Components: iPOJO
> Reporter: Andriyko
> Assignee: Clement Escoffier
> Labels: documentation, felix,, ipojo
>
> In the documentation on iPOJO Services:
> http://felix.apache.org/site/providing-osgi-services.html#ProvidingOSGiservices-Instancereconfiguration
> There is no clear explanation of what is the difference between <provides>
> and <instance>.
> It is not clear why "instance" is needed at all.
> Under the "Service Properties" heading on the page, the two are used
> interchangeably in the examples.
> For example, first "property" is configured with <provides>:
> <component classname="...FooProviderType1">
> <provides>
> <property name="foo" field="m_foo" value="Foo"/>
> <property name="static" type="java.lang.String"
> value="this is a static property"/>
> </provides>
> </component>
> and then immediately, with no explanation what-so-ever and <intsance> is
> used, with a tiny explanation that "The value can be given in the instance
> configuration":
> <instance component="...FooProviderType1">
> <property name="foo" value="My New Foo Value"/>
> <property name="static" value="My Value For Static"/>
> </instance>
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