Can an OSGi fragment bundle publish a declarative service?

Question

I have a fragment bundle that I created to access some add functionality to a second-party jar. My fragment should register a service to expose this new functionality. It doesn't seem to work. Before I get deep into troubleshooting, I'd like to know if this is even allowed? That is, does Felix SCR's bundle watcher look at or ignore fragments?

Chris Dolan · Accepted Answer · 2012-07-13T20:41:11.660

9

Aha, I found the answer myself in the spec, section 112.4.2: "A Service-Component manifest header specified in a fragment is ignored by SCR." This is consistent with 3.14.3: "The following list contains the headers that must not be used in a fragment bundle: Bundle-Activator"

edited Jul 13 '12 at 20:41

answered Jul 13 '12 at 20:32

Chris Dolan

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See also http://stackoverflow.com/questions/8592860/component-inside-a-fragment-never-activated, which confirms what you just said, but with the added information that blueprint does work for fragments. – Holly Cummins Jul 14 '12 at 01:06

score 6 · Answer 2 · answered Feb 06 '17 at 07:27

Yes. But the host bundle must be open to this. By open, I mean the host bundle must have the Service-Components header configured such that any descriptors in the fragment will be found. For example:

Service-Components: OSGI-INF/*.xml

will find all .xml files in the OSGi-INF/ folder of the host bundle all the attached fragments.

I saw Eclipse SmartHome project use this solution to make their UI more customizable.

More information: http://apache-felix.18485.x6.nabble.com/DS-amp-fragments-td5004610.html

Using header `Service-Component: OSGI-INF/*.xml` (not plural) is what worked for me. — Mossmyr, Aug 17 '21 at 13:25

Can an OSGi fragment bundle publish a declarative service?

2 Answers2