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[[Category:OSGi]]{{Ecl_menu}}[[Category:ECL_Activities]]__NOTOC__{{Ecl_installation|type=OSGi|type-small=osgi|name=Eclipse Classic|install=Follow this [http://www.vogella.de/articles/OSGi/article.html tutorial to build OSGi bundels after you install Elcipse Classic]}}
<h3>Steps for Building the first Bundle</h3> <h4>1. Study the Interfaces</h4> * [http://downloadwww.eclipseosgi.org/equinoxjavadoc/ Equinox Downloadsr4v42/org/osgi/framework/Bundle.html Bundle]* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleContext.html BundleContext]* [http://www.osgi.org/javadoc/r4v42/org/osgi/framework/BundleActivator.html BundleActivator]---------- <h4>2. Define the BundleActivator class</h4> The ''BundleActivator'' customizes the starting and stopping of a bundle. ''BundleActivator'' is an interface that may be implemented when a bundle is started or stopped. The Framework can create instances of a bundle's ''BundleActivator'' as required. If an instance's ''BundleActivator.start'' method executes successfully, it is guaranteed that the same instance's ''BundleActivator.stop'' method will be called when the bundle is to be stopped. The Framework must not concurrently call a BundleActivator object. ''BundleActivator'' is specified through the Bundle-Activator Manifest header.<source lang="java">package cs.ecl.osgi.simple.helloworld; import org.osgi.framework.BundleActivator;import org.osgi.framework.BundleContext; public class Activator implements BundleActivator { private static BundleContext context; static BundleContext getContext() { return context; } public void start(BundleContext bundleContext) throws Exception { Activator.context = bundleContext; System.out.println("Hello World from OSGi - start method in BundleActivator!"); } public void stop(BundleContext bundleContext) throws Exception { Activator.context = null; System.out.println("Goodby World from OSGi - stop method in BundleActivator!"); } }</source> <h4>2. Define the MANIFEST.MF</h4> for the ''cs.ecl.osgi.simple.helloworld'' bundle <source lang="xml">Manifest-Version: 1.0Bundle-ManifestVersion: 2Bundle-Name: HelloworldBundle-SymbolicName: cs.ecl.osgi.simple.helloworldBundle-Version: 1.0.0.qualifierBundle-Activator: cs.ecl.osgi.simple.helloworld.ActivatorBundle-Vendor: Seneca College - Eclipse CourseBundle-RequiredExecutionEnvironment: JavaSE-1.6Import-Package: org.osgi.framework;version="1.3.0"Bundle-ActivationPolicy: lazy</source> The file defines:1. The bundle identity by headers value of Bundle-SymbolicName and Bundle-Version cs.ecl.osgi.simple.helloworld & 1.0.0.qualifier 2. The bundle requirements by header value of Import-Package org.osgi.framework;version="1.3.0" 3. The bundle activator by header value Bundle-Activator cs.ecl.osgi.simple.helloworld.Activator
