Chapter 65. The OSGi Plugin

Table of Contents

65.1. Usage
65.2. Implicitly applied plugins
65.3. Tasks
65.4. Convention object

The OSGi plugin provides a factory method to create an OsgiManifest object. OsgiManifest extends Manifest. To learn more about generic manifest handling, see Section 47.15.1, “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 the BND tool. A separate plugin implementation is maintained by the BND authors that has more advanced features.

65.1. Usage

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

Example 65.1. Using the OSGi plugin

build.gradle

apply plugin: 'osgi'

65.2. Implicitly applied plugins

Applies the Java base plugin.

65.3. Tasks

The OSGi plugin adds the following tasks to the project:

Table 65.1. OSGi plugin - tasks

Task name Depends on Type Description
osgiClasses classes Sync Copies all classes from the main source set to a single directory that is processed by BND.

65.4. Convention object

The OSGi plugin adds the following convention object: OsgiPluginConvention

65.4.1. Convention properties

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

65.4.2. Convention methods

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

Table 65.2. 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 65.2. 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.