Easy-peasy OSGi Development with Bndtools - Neil Bartlett

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Developing OSGi bundles is just too hard! That gnarly old manifest; listing all the imported packages (again!); writing all those XML files... who needs that kind of hassle? My goal when I began development of Bndtools was to change this picture drastically: to make it actually _easier_ to develop and test OSGi applications, composed of high quality reusable bundles, than it is to develop "traditional" non-modular Java applications. Now with the help of a growing community of contributors and brave alpha testers, that vision is beginning to come true. Bndtools is an Eclipse IDE for OSGi development, based on bnd. In this talk I will demonstrate the features of Bndtools that help to make it fun and easy to build bundles. I will also talk about: Declarative Services with Java annotations; OBR for release management and provisioning; and integration testing strategies.

Technology Business

Easy-peasy OSGi Development with
Bndtools
Neil Bartlett

Paremus Ltd

21 September 2011

OSGi Alliance Marketing © 2008-2010 . All1
Page
COPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved
Rights Reserved

My Mission

• To mercilessly destroy sources of OSGi
pain and bafﬂement.
• Make it easy to do the right thing, and hard
to do the wrong thing.
• Don’t just talk Best Practices... create them.

“OSGi development
cannot be made [...]
easy or productive”
– Rod Johnson
(emphasis added for comic effect)

Bugbear #1

• Require-Bundle is evil
• Import-Package is a nightmare to maintain

But... The Packages are
RIGHT THERE!!!
package org.example.auction.basic;

import org.example.auction.AuctionService;
import org.osgi.framework.Constants;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;

Bugbear #2

• The rules of versioning are not hard to
understand, but...
• Managing thousands of versioned packages
is impossible
• Therefore version only bundles, or ignore
versioning entirely

Bugbear #2

• Managing thousands of versioned packages
is impossible... FOR HUMANS
• Use the machine!

Service Provider

api [1.0,1.1) api 1.0.0

Without API Bundle

api [1.0,1.1) api 1.0.0 api

With API Bundle
api 1.0.1

api [1.0,1.1) api 1.0.0 api

In-Container Testing
OSGi Framework
Bundles Under Test

Auction Event
...
Server Admin

Test Bundles

Test Test
...
Bundle 1 Bundle 2

JUnit Runner

But I Use Maven!

• Maven and Bndtools, sitting in a tree,
k.i.s.s.i.n.g.

Bndtools: Maven:

• Designing Bundles • Build dependencies
• Instant Build/Run • Repeatable ofﬂine
builds
• Bundle Analysis
• Reports

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1. Easy-peasy OSGi Development with Bndtools Neil Bartlett Paremus Ltd 21 September 2011 OSGi Alliance Marketing © 2008-2010 . All1 Page COPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved Rights Reserved

2. Good News Everyone! Hardly any slides!

3. My Mission • To mercilessly destroy sources of OSGi pain and bafﬂement. • Make it easy to do the right thing, and hard to do the wrong thing. • Don’t just talk Best Practices... create them.

4. Make OSGi Fun!

5. “OSGi development cannot be made [...] easy or productive” – Rod Johnson (emphasis added for comic effect)

7. Bugbear #1 • Require-Bundle is evil • Import-Package is a nightmare to maintain

8. But... The Packages are RIGHT THERE!!! package org.example.auction.basic; import org.example.auction.AuctionService; import org.osgi.framework.Constants; import org.osgi.service.event.Event; import org.osgi.service.event.EventAdmin;

9. D.R.Y.

10. Bugbear #2 • The rules of versioning are not hard to understand, but... • Managing thousands of versioned packages is impossible • Therefore version only bundles, or ignore versioning entirely

11.

12. Bugbear #2 • Managing thousands of versioned packages is impossible... FOR HUMANS • Use the machine!

13. Pure API Bundle api 1.0.0

14. Service Provider api [1.0,1.1) api 1.0.0

15. Service Consumer api

16. Without API Bundle api [1.0,1.1) api 1.0.0 api

17. With API Bundle api 1.0.1 api [1.0,1.1) api 1.0.0 api

18. Oops! api 1.0.1 api 1.0.0 api

19. In-Container Testing OSGi Framework Bundles Under Test Auction Event ... Server Admin Test Bundles Test Test ... Bundle 1 Bundle 2 JUnit Runner

20. But I Use Maven! • Maven and Bndtools, sitting in a tree, k.i.s.s.i.n.g.

21. Bndtools: Maven: • Designing Bundles • Build dependencies • Instant Build/Run • Repeatable ofﬂine builds • Bundle Analysis • Reports

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