You can configure the default OSGi Framework for new
 OSGi Framework launchers 
 using the
 
 
 Window > Preferences... > Plug-in Development > OSGi Frameworks preference page.
All available OSGi Frameworks are listed in the Installed OSGi Frameworks
 table.  To contribute an OSGi Framework, the plug-in containing the framework
 implementation must contain an
 org.eclipse.pde.ui.osgiFrameworks
 extension.  

To set a framework as the default for new OSGi Framework launch configurations, select the framework entry in the table and click the Set as Default button.