Chapter 37. The OSGi Plugin

The OSGi plugin provides a factory method to create an OsgiManifest object. OsgiManifest extends Manifest. To learn more about generic manifest handling, see Section 23.14.1, “Manifest”. If the Java plugins is applied, the OSGi plugin replaces the manifest object of the default jar with an OsgiManifest object. The replaced manifest is merged into the new one.

The OSGi plugin makes heavy use of Peter Kriens BND tool.

37.1. Usage

To use the OSGi plugin, include the following in your build script:

Example 37.1. Using the OSGi plugin

build.gradle

apply plugin: 'osgi'

37.2. Implicitly applied plugins

Applies the Java base plugin.

37.3. Tasks

This plugin does not add any tasks.

37.4. Dependency management

TBD

37.5. Convention object

The OSGi plugin adds the following convention object: OsgiPluginConvention

37.5.1. Convention properties

The OSGi plugin does not add any convention properties to the project.

37.5.2. Convention methods

The OSGi plugin adds the following methods. For more details, see the API documentation of the convention object.

Table 37.1. OSGi methods

Method	Return Type	Description
osgiManifest()	`OsgiManifest`	Returns an OsgiManifest object.
osgiManifest(Closure cl)	`OsgiManifest`	Returns an OsgiManifest object configured by the closure.

The classes in the classes dir are analyzed regarding their package dependencies and the packages they expose. Based on this the Import-Package and the Export-Package values of the OSGi Manifest are calculated. If the classpath contains jars with an OSGi bundle, the bundle information is used to specify version information for the Import-Package value. Beside the explicit properties of the OsgiManifest object you can add instructions.

Example 37.2. Configuration of OSGi MANIFEST.MF file

build.gradle

jar {
    manifest { // the manifest of the default jar is of type OsgiManifest
        name = 'overwrittenSpecialOsgiName'
        instruction 'Private-Package',
                'org.mycomp.package1',
                'org.mycomp.package2'
        instruction 'Bundle-Vendor', 'MyCompany'
        instruction 'Bundle-Description', 'Platform2: Metrics 2 Measures Framework'
        instruction 'Bundle-DocURL', 'http://www.mycompany.com'
    }
}
task fooJar(type: Jar) {
    manifest = osgiManifest {
        instruction 'Bundle-Vendor', 'MyCompany'    
    }
}

The first argument of the instruction call is the key of the property. The other arguments form the value. To learn more about the available instructions have a look at the BND tool.