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OSGi and Spring Data 
for simple (Web) Application 
Development 
Christian Baranowski 
Content of my talk in a sentence 
„Java development with Bndtools and bnd is so much fun!“ 
My Talk in three Words - „Bndtools is cool!“
Bndtools 
Easy, powerful and productive way to develop 
OSGi applications. Based on bnd and Eclipse. 
http://bndtools.org/ 
„Development should be fun, so you need the right tools!“
enRoute 
• Getting started with OSGi → enRoute project 
http://enroute.osgi.org/ 
• The talk is based on the ideas from the enRoute blog demo 
project 
• enRoute OSGi blog sample project by Peter Kriens 
https://github.com/osgi/osgi.enroute.blog/ 
• Step by step tutorial from Peter Kriens 
http://goo.gl/Y569g5 
• Last OSGi Code Camp (Ludwigsburg 2013) was based on this 
step by step tutorial
Running Blog Example 
OSGi Framework 
(Equinox) 
MySQL 
… 
HTTP Server 
(Jetty) 
JPA 
(EclipseLink) 
Web Browser 
(IE, FF, Chrome, Safarie..) 
HTTP / 80 
simple.web.blog.web 
simple.web.blog.data 
MySQL JDBC / 3306 
Web Layer 
Persistence Layer
Persistence Layer (JPA) 
simple.web.blog 
.configuration 
Configuration extender" 
configuration/*.yaml 
javax.persistence.EntityManagerFactory" 
osgi.unit.name: Blog 
…jdbc.DataSourceFactory …cm.ConfigurationAdmin 
Eclipse Gemini 
dbaccess mysql 
osgi.configuration.yaml 
…cm.ManagedServiceFactory" 
Service PID: gemini.jpa.punit 
Apache Felix" 
Config Admin 
simple.web.blog.data 
Eclipse Gemini 
JPA 
JPA extender create service" 
javax.persistence.EntityManagerFactory 
Bundle Manifest contains" 
Meta-Persistence header 
org.eclipse.persistence.jpa com.mysql.jdbc 
org.yaml.snakeyaml
Spring Data Extender 
register the dynamic implementation of the service 
osgi.jpa.springdata 
… 
JPA-Repositories: 
sample.webapp.data.BlogRepository 
… 
provider 
MANIFEST.MF 
Extender for JPA Repositories 
public interface BlogRepository extends JpaRepository<Blog, Long> { 
! 
List<Blog> findByTitleContaining(String part); 
! 
} 
consumer 
@Entity 
public class Blog { 
@Id 
@GeneratedValue 
public Long id; 
public String title; 
public String content; 
} 
extender looks for bundles with " 
JPA-Repositories headers
Simple Transaction Management 
provider 
Service 
Registry 
setup a proxy service with the transaction logic 
@Reference(target = isTransactionalService) 
public void setService(Service srv) 
transactional.service = true requieres.tx.mgnt = true 
consumer osgi.jpa.tx 
Whiteboard for services which has a " 
requires.tx.mgnt service property 
Proxy " 
Service 
if (tx.isTransactionOpen()) { 
return method.invoke(bundleContext.getService(serviceReference), args); 
} 
try { 
tx.begin(); 
Object result = method.invoke(bundleContext.getService(serviceReference), args); 
tx.commit(); 
return result; 
} catch (Exception exp) { 
tx.rollback(); 
throw exp; 
} finally { 
bundleContext.ungetService(txMgrServiceReference); 
}
Spock based OSGi Integration Tests 
osgi.jpa.springdata 
simple.web.blog" 
.data 
Extender for JPA Repositories 
simple.web.blog.data.tests osgi.jpa.tx 
requieres.tx.mgnt = true 
transactional.service = true 
class BlogRepositorySpec extends Specification { 
! 
@OSGiService 
BlogRepository blogRepository 
def setup() { 
blogRepository.deleteAll() 
blogRepository.save(new Blog(title: 'OSGi Web Dev')) 
blogRepository.save(new Blog(title: 'OSGi V.S Java EE')) 
} 
def findBlogPostByTitleContainingOSGi() { 
when: 
def list = blogRepository.findByTitleContaining("OSGi") 
then: 
list.size() == 2 
} 
}
Web Layer 
https://github.com/alrra/browser-logos
Jersey MVC (Server Side Web-App) 
Handlebars View (list.hbs): 
<html> 
<head> 
{{#resource type="css"}} /css/app.css {{/resource}} 
</head> 
<body> 
<table class="table table-striped"> 
<thead> 
<th>#id</th><th>Title</th><th>Content</th><th></th> 
</thead> 
{{#html-table-content columns="id, title, content" resource="blog"}} 
{{/html-table-content}} 
</table> 
{{#html-pagination}} {{/html-pagination}} 
</body> 
</html> 
! 
@GET 
@Produces( MediaType.TEXT_HTML ) 
@Template(name="list.hbs") 
public Page<Blog> list( 
@QueryParam("page") @DefaultValue("0") Integer page, 
@QueryParam("size") @DefaultValue("10") Integer size) { 
return blogRepository.findAll(new PageRequest(page, size)); 
} 
com.github.jknack." 
handlebars 
Controller Method 
return the model 
Controller (BlogController): 
Handlebars " 
Helpers 
osgi-jax-rs-connector
Handlebars Helpers 
… 
osgi.web.templates" 
.handlebars.helpers 
com.github.jknack.handlebars.Helper" 
name = … 
…Helper" 
name=html-pagination 
Whiteboard for 
Helpers 
…Helper" 
name=html-table-content 
<thead> 
<th>#id</th><th>Title</th><th>Content</th><th></th> 
</thead> 
{{#html-table-content columns="id, title, content" resource="blog"}} 
{{/html-table-content}} 
osgi.web.templates" 
.handlebars 
org.glassfish.jersey.server.mvc.spi." 
TemplateProcessor<String> 
Whiteboard for " 
JAX-RS Provides 
osgi-jax-rs-connector 
Extend templates and provide components for the HTML UI
Static Web Bundles 
<html> 
<head> 
{{#resource type="css"}} 
/css/app.css 
{{/resource}} 
</head> 
OSGi way of web dependency management 
for CSS or JavaScript frameworks 
simple.web.blog.web osgi.web.bootstrap 
MANIFEST.MF MANIFEST.MF 
Require-Capability:  
bootstrap.css; 
filter:="(&(version>=3.1.1)(!(version>=4.0.0)))" 
Provide-Capability:  
bootstrap.css; 
version:Version=3.1.1; 
type=css 
@Requieres.Bootstrap 
@Component 
@Path("/products") 
public class BlogController 
More details see 
aQute.bnd.annotation.headers.RequireCapability" 
or" 
aQute.bnd.annotation.headers.ProvideCapability! 
bnd annotations.
Modern Web Applications 
HTTP / 8080 
REST Resource (API)" 
JSON 
UI 
business logic" 
data access logic 
HTML5" 
JavaScript (CoffeScript, …)" 
CSS3 (SASS, LESS, ..) 
JAVA 8" 
OSGi
Web Bundle build with Yeoman Grunt Bower 
yeoman Grunt bower 
• Scaffolding tool for webapps" 
• Yeoman helps kickstart new projects" 
• provide a generator ecosystem 
http://yeoman.io/ 
• JavaScript Task Runner " 
• Grunt ecosystem is huge" 
• minification, compilation, unit 
testing, linting, … 
http://gruntjs.com/ 
• package manager for the web" 
• solution to the problem of front-end 
package management" 
• ecosystem is huge 
http://bower.io/ 
Thats the tool chain web developers love…
Building Web Applications 
HTTP / 8080 
REST Resource (API)" 
JSON 
UI 
business logic" 
data access logic 
HTML5" 
JavaScript (CoffeScript, …)" 
CSS3 (SASS, LESS, ..) 
JAVA 8" 
OSGi 
yeomen, grunt, bower 
bndtools 
Gradle, tests and builds the OSGi and the Web application 
Web Developers 
Java Developers (OSGi)
AngularJS REST Consumer (Client) 
$blogResource (REST Consumer) 
! 
angular.module('blogApp') 
.factory('$blogResource', ['$resource', function($resource) { 
return $resource( '/rest/blog/:postId', { postId: '@postId' }, { }); 
}]); 
MainCtrl (the controller is using the REST resource to delete a blog entry) 
angular.module('blogApp') 
.controller('MainCtrl', ['$scope','$blogResource', function($scope, $blogResource) { 
$scope.posts = $blogResource.query(); 
$scope.deletePost = function(post) { 
$blogResource.delete({postId: post.id}).$promise.then(function() { 
$scope.posts = $blogResource.query(); 
}); 
}; 
}]);
REST Resource (JAX-RS) Provider 
@Component 
@Path("/rest/blog") 
public class BlogResource implements Resource { 
! 
BlogRepository blogRepository; 
! 
@Reference(target = isTransactionalService) 
public void setBlogRepository(BlogRepository blogRepository) { … } 
@GET 
public List<Blog> query() { return blogRepository.findAll(); } 
@GET 
@Path("/{id}") 
public Blog get(@PathParam("id") Long id) { return blogRepository.getOne(id); } 
@POST 
public void post(Blog blog) { blogRepository.save(blog); } 
@DELETE 
@Path("/{id}") 
public void delete(@PathParam("id") Long id) { blogRepository.delete(id); } 
} 
A REST Resource build in standard and flexible way based on JAX-RS
Integration Testing REST Resources 
simple.web.blog.web.tests 
simple.web.blog.data.BlogRepository" 
transactional.service = true 
simple.web.blog.web 
class BlogResourceSpec extends Specification { 
! 
@OSGiServiceRegistration(properties=["transactional.service = true"]) 
BlogRepository mockBlogRepository = Mock(BlogRepository) 
def getProductsByExistingId() { 
given: 
mockBlogRepository.findOne(42) >> new Blog(title: 'OSGi in Action', content: '-') 
when: 
Client client = ClientBuilder.newClient(); 
Response response = client 
.target("http://localhost:8080") 
.path("halres").path("blog").path("42").request().get(); 
then: 
response.status == Status.OK.statusCode 
} 
HTTP / 80
Testing AngularJS Controllers 
// Initialize the controller and a mock scope 
beforeEach(inject(function ($controller, $rootScope, $injector) { 
scope = $rootScope.$new(); 
$httpBackend = $injector.get('$httpBackend'); 
$httpBackend.expect('GET', '/rest/blog').respond([{id: 1}, {id: 42}]); 
MainCtrl = $controller('MainCtrl', { 
$scope: scope 
}); 
})); 
it('should send a request to delete a blog post', function () { 
$httpBackend.expect('DELETE', '/rest/blog/42').respond(200, 'success'); 
$httpBackend.expect('GET', '/rest/blog').respond([{id: 1}]); 
scope.deletePost({id: 42}); 
$httpBackend.flush(); 
expect(scope.posts.toString()).toBe([{id: 1}].toString()); 
});
Technologie Stack 
• Modern Web-Application OSGi Stack 
• AngularJS (Superheroic JavaScript Framework) 
https://angularjs.org/ 
• Jetty (Web Server) 
https://www.eclipse.org/jetty/ 
• osgi-jax-rs-connector (Jersey) 
https://github.com/hstaudacher/osgi-jax-rs-connector 
• Spring Data JPA (for simple JPA Services) 
http://projects.spring.io/spring-data-jpa/ 
• Spock (testing and specification framework) 
https://code.google.com/p/spock/ 
• Eclipse Equinox or Apache Felix as powerful OSGi Framework
Feedback 
„Erik Meijer: 
Are you saying you cannot write large programs in Java? 
Anders Hejlsberg: 
No, you can write large programs in Java. 
You just can’t maintain them. „ 
Quelle - http://t.co/Uw2iglqf 
Compose small “applications” (modules) 
in to large systems. 
Quelle - http://t.co/Uw2iglqf
Resources 
• OSGi Simple Blog App (Source, Slides) 
https://github.com/tux2323/simple.web.blog

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OSGi and Spring Data for simple (Web) Application Development

  • 1. OSGi and Spring Data for simple (Web) Application Development Christian Baranowski Content of my talk in a sentence „Java development with Bndtools and bnd is so much fun!“ My Talk in three Words - „Bndtools is cool!“
  • 2. Bndtools Easy, powerful and productive way to develop OSGi applications. Based on bnd and Eclipse. http://bndtools.org/ „Development should be fun, so you need the right tools!“
  • 3. enRoute • Getting started with OSGi → enRoute project http://enroute.osgi.org/ • The talk is based on the ideas from the enRoute blog demo project • enRoute OSGi blog sample project by Peter Kriens https://github.com/osgi/osgi.enroute.blog/ • Step by step tutorial from Peter Kriens http://goo.gl/Y569g5 • Last OSGi Code Camp (Ludwigsburg 2013) was based on this step by step tutorial
  • 4. Running Blog Example OSGi Framework (Equinox) MySQL … HTTP Server (Jetty) JPA (EclipseLink) Web Browser (IE, FF, Chrome, Safarie..) HTTP / 80 simple.web.blog.web simple.web.blog.data MySQL JDBC / 3306 Web Layer Persistence Layer
  • 5. Persistence Layer (JPA) simple.web.blog .configuration Configuration extender" configuration/*.yaml javax.persistence.EntityManagerFactory" osgi.unit.name: Blog …jdbc.DataSourceFactory …cm.ConfigurationAdmin Eclipse Gemini dbaccess mysql osgi.configuration.yaml …cm.ManagedServiceFactory" Service PID: gemini.jpa.punit Apache Felix" Config Admin simple.web.blog.data Eclipse Gemini JPA JPA extender create service" javax.persistence.EntityManagerFactory Bundle Manifest contains" Meta-Persistence header org.eclipse.persistence.jpa com.mysql.jdbc org.yaml.snakeyaml
  • 6. Spring Data Extender register the dynamic implementation of the service osgi.jpa.springdata … JPA-Repositories: sample.webapp.data.BlogRepository … provider MANIFEST.MF Extender for JPA Repositories public interface BlogRepository extends JpaRepository<Blog, Long> { ! List<Blog> findByTitleContaining(String part); ! } consumer @Entity public class Blog { @Id @GeneratedValue public Long id; public String title; public String content; } extender looks for bundles with " JPA-Repositories headers
  • 7. Simple Transaction Management provider Service Registry setup a proxy service with the transaction logic @Reference(target = isTransactionalService) public void setService(Service srv) transactional.service = true requieres.tx.mgnt = true consumer osgi.jpa.tx Whiteboard for services which has a " requires.tx.mgnt service property Proxy " Service if (tx.isTransactionOpen()) { return method.invoke(bundleContext.getService(serviceReference), args); } try { tx.begin(); Object result = method.invoke(bundleContext.getService(serviceReference), args); tx.commit(); return result; } catch (Exception exp) { tx.rollback(); throw exp; } finally { bundleContext.ungetService(txMgrServiceReference); }
  • 8. Spock based OSGi Integration Tests osgi.jpa.springdata simple.web.blog" .data Extender for JPA Repositories simple.web.blog.data.tests osgi.jpa.tx requieres.tx.mgnt = true transactional.service = true class BlogRepositorySpec extends Specification { ! @OSGiService BlogRepository blogRepository def setup() { blogRepository.deleteAll() blogRepository.save(new Blog(title: 'OSGi Web Dev')) blogRepository.save(new Blog(title: 'OSGi V.S Java EE')) } def findBlogPostByTitleContainingOSGi() { when: def list = blogRepository.findByTitleContaining("OSGi") then: list.size() == 2 } }
  • 10. Jersey MVC (Server Side Web-App) Handlebars View (list.hbs): <html> <head> {{#resource type="css"}} /css/app.css {{/resource}} </head> <body> <table class="table table-striped"> <thead> <th>#id</th><th>Title</th><th>Content</th><th></th> </thead> {{#html-table-content columns="id, title, content" resource="blog"}} {{/html-table-content}} </table> {{#html-pagination}} {{/html-pagination}} </body> </html> ! @GET @Produces( MediaType.TEXT_HTML ) @Template(name="list.hbs") public Page<Blog> list( @QueryParam("page") @DefaultValue("0") Integer page, @QueryParam("size") @DefaultValue("10") Integer size) { return blogRepository.findAll(new PageRequest(page, size)); } com.github.jknack." handlebars Controller Method return the model Controller (BlogController): Handlebars " Helpers osgi-jax-rs-connector
  • 11. Handlebars Helpers … osgi.web.templates" .handlebars.helpers com.github.jknack.handlebars.Helper" name = … …Helper" name=html-pagination Whiteboard for Helpers …Helper" name=html-table-content <thead> <th>#id</th><th>Title</th><th>Content</th><th></th> </thead> {{#html-table-content columns="id, title, content" resource="blog"}} {{/html-table-content}} osgi.web.templates" .handlebars org.glassfish.jersey.server.mvc.spi." TemplateProcessor<String> Whiteboard for " JAX-RS Provides osgi-jax-rs-connector Extend templates and provide components for the HTML UI
  • 12. Static Web Bundles <html> <head> {{#resource type="css"}} /css/app.css {{/resource}} </head> OSGi way of web dependency management for CSS or JavaScript frameworks simple.web.blog.web osgi.web.bootstrap MANIFEST.MF MANIFEST.MF Require-Capability: bootstrap.css; filter:="(&(version>=3.1.1)(!(version>=4.0.0)))" Provide-Capability: bootstrap.css; version:Version=3.1.1; type=css @Requieres.Bootstrap @Component @Path("/products") public class BlogController More details see aQute.bnd.annotation.headers.RequireCapability" or" aQute.bnd.annotation.headers.ProvideCapability! bnd annotations.
  • 13. Modern Web Applications HTTP / 8080 REST Resource (API)" JSON UI business logic" data access logic HTML5" JavaScript (CoffeScript, …)" CSS3 (SASS, LESS, ..) JAVA 8" OSGi
  • 14. Web Bundle build with Yeoman Grunt Bower yeoman Grunt bower • Scaffolding tool for webapps" • Yeoman helps kickstart new projects" • provide a generator ecosystem http://yeoman.io/ • JavaScript Task Runner " • Grunt ecosystem is huge" • minification, compilation, unit testing, linting, … http://gruntjs.com/ • package manager for the web" • solution to the problem of front-end package management" • ecosystem is huge http://bower.io/ Thats the tool chain web developers love…
  • 15. Building Web Applications HTTP / 8080 REST Resource (API)" JSON UI business logic" data access logic HTML5" JavaScript (CoffeScript, …)" CSS3 (SASS, LESS, ..) JAVA 8" OSGi yeomen, grunt, bower bndtools Gradle, tests and builds the OSGi and the Web application Web Developers Java Developers (OSGi)
  • 16. AngularJS REST Consumer (Client) $blogResource (REST Consumer) ! angular.module('blogApp') .factory('$blogResource', ['$resource', function($resource) { return $resource( '/rest/blog/:postId', { postId: '@postId' }, { }); }]); MainCtrl (the controller is using the REST resource to delete a blog entry) angular.module('blogApp') .controller('MainCtrl', ['$scope','$blogResource', function($scope, $blogResource) { $scope.posts = $blogResource.query(); $scope.deletePost = function(post) { $blogResource.delete({postId: post.id}).$promise.then(function() { $scope.posts = $blogResource.query(); }); }; }]);
  • 17. REST Resource (JAX-RS) Provider @Component @Path("/rest/blog") public class BlogResource implements Resource { ! BlogRepository blogRepository; ! @Reference(target = isTransactionalService) public void setBlogRepository(BlogRepository blogRepository) { … } @GET public List<Blog> query() { return blogRepository.findAll(); } @GET @Path("/{id}") public Blog get(@PathParam("id") Long id) { return blogRepository.getOne(id); } @POST public void post(Blog blog) { blogRepository.save(blog); } @DELETE @Path("/{id}") public void delete(@PathParam("id") Long id) { blogRepository.delete(id); } } A REST Resource build in standard and flexible way based on JAX-RS
  • 18. Integration Testing REST Resources simple.web.blog.web.tests simple.web.blog.data.BlogRepository" transactional.service = true simple.web.blog.web class BlogResourceSpec extends Specification { ! @OSGiServiceRegistration(properties=["transactional.service = true"]) BlogRepository mockBlogRepository = Mock(BlogRepository) def getProductsByExistingId() { given: mockBlogRepository.findOne(42) >> new Blog(title: 'OSGi in Action', content: '-') when: Client client = ClientBuilder.newClient(); Response response = client .target("http://localhost:8080") .path("halres").path("blog").path("42").request().get(); then: response.status == Status.OK.statusCode } HTTP / 80
  • 19. Testing AngularJS Controllers // Initialize the controller and a mock scope beforeEach(inject(function ($controller, $rootScope, $injector) { scope = $rootScope.$new(); $httpBackend = $injector.get('$httpBackend'); $httpBackend.expect('GET', '/rest/blog').respond([{id: 1}, {id: 42}]); MainCtrl = $controller('MainCtrl', { $scope: scope }); })); it('should send a request to delete a blog post', function () { $httpBackend.expect('DELETE', '/rest/blog/42').respond(200, 'success'); $httpBackend.expect('GET', '/rest/blog').respond([{id: 1}]); scope.deletePost({id: 42}); $httpBackend.flush(); expect(scope.posts.toString()).toBe([{id: 1}].toString()); });
  • 20. Technologie Stack • Modern Web-Application OSGi Stack • AngularJS (Superheroic JavaScript Framework) https://angularjs.org/ • Jetty (Web Server) https://www.eclipse.org/jetty/ • osgi-jax-rs-connector (Jersey) https://github.com/hstaudacher/osgi-jax-rs-connector • Spring Data JPA (for simple JPA Services) http://projects.spring.io/spring-data-jpa/ • Spock (testing and specification framework) https://code.google.com/p/spock/ • Eclipse Equinox or Apache Felix as powerful OSGi Framework
  • 21. Feedback „Erik Meijer: Are you saying you cannot write large programs in Java? Anders Hejlsberg: No, you can write large programs in Java. You just can’t maintain them. „ Quelle - http://t.co/Uw2iglqf Compose small “applications” (modules) in to large systems. Quelle - http://t.co/Uw2iglqf
  • 22. Resources • OSGi Simple Blog App (Source, Slides) https://github.com/tux2323/simple.web.blog