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1. Launch Eclipse and switch to Java EE perspective.
   
   
   
   
2. Right click under the project explorer and select Enterprise OSGi Application Project as shown in the figure. Make sure that the target runtime is Apache Geronimo v3.0
   
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3. Name the project as HelloWorld and click Next.
   
   
   
   
   
4. Click New Bundle... to define api, client and server bundles to be included in this application. Note that interface and implementation classes should be kept in separate bundles so that the implementations could be replaced independently of their interfaces. Select Change the active Target Platform if necessary.
   
   
5. Click Finish and all relevant projects are created as followed.
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Adding a class to the api project

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1. Right-click the project com.sample.blueprint.helloworld.server and create a new class as shown in the figure.
   
   
2. Name the class as HelloWorldServiceImpl and the interface as HelloWorldService, then click Finish.
   
   
3. Modify the code of HelloWorldServiceImpl as follows.
   

   Code Block
   java java title HelloWorldServiceImpl.java
   package com.sample.blueprint.helloworld.server; import com.sample.blueprint.helloworld.api.*; public class HelloWorldServiceImpl implements HelloWorldService { public void hello() { System.out.println("======>>> A message from the server: Hello World!"); } public void startUp() { System.out.println("======>>> Starting HelloWorld Server"); } }

4. Right-click the project name and create a Blueprint file, then modify the xml file as follows. The blueprint file is placed under OSGI-INF\blueprint directory automatically.
   

   Code Block
   xml blueprint.xml
   <?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <bean id="helloservice" class="com.sample.blueprint.helloworld.server.HelloWorldServiceImpl" init-method="startUp"> </bean> <service ref="helloservice" interface="com.sample.blueprint.helloworld.api.HelloWorldService"/> </blueprint>

5. Modify META-INF\MANIFEST.MF and make sure com.sample.blueprint.helloworld.api is listed under Import-Pakcage.
   

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1. Right-click the project com.sample.blueprint.helloworld.client and create a new class as shown in the figure.
   
   
2. Name the class as HelloWorldClient and click Finish.
   
   
3. Modify the code of HelloWorldClient as follows.
   

   Code Block
   java java title HelloWorldClient.java
   package com.sample.blueprint.helloworld.client; import com.sample.blueprint.helloworld.api.HelloWorldService; public class HelloWorldClient { HelloWorldService helloWorldService = null; public void startUp() { System.out .println("========>>>>Client HelloWorld: About to execute a method from the Hello World service"); helloWorldService.hello(); System.out .println("========>>>>Client HelloWorld: ... if you didn't just see a Hello World message something went wrong"); } public HelloWorldService getHelloWorldService() { return helloWorldService; } public void setHelloWorldService(HelloWorldService helloWorldService) { this.helloWorldService = helloWorldService; } }

4. Right-click the project name and create a Blueprint file, then modify the xml file as follows. The xml is placed under OSGI-INF\blueprint directory automatically.
   

   Code Block
   xml blueprint.xml
   <?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <reference id="helloservice" interface="com.sample.blueprint.helloworld.api.HelloWorldService" /> <bean id="helloclient" class="com.sample.blueprint.helloworld.client.HelloWorldClient" init-method="startUp"> <property name="helloWorldService" ref="helloservice" /> </bean> </blueprint>

5. Modify META-INF\MANIFEST.MF and make sure com.sample.blueprint.helloworld.api is listed under Import-Pakcage.
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Run and deploy

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